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mariadb/storage/xtradb/srv/srv0srv.cc
Marko Mäkelä 26a14ee130 Merge 10.1 into 10.2
2019-05-13 17:54:04 +03:00

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/*****************************************************************************
Copyright (c) 1995, 2017, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2008, 2009 Google Inc.
Copyright (c) 2009, Percona Inc.
Copyright (c) 2013, 2019, MariaDB Corporation.
Portions of this file contain modifications contributed and copyrighted by
Google, Inc. Those modifications are gratefully acknowledged and are described
briefly in the InnoDB documentation. The contributions by Google are
incorporated with their permission, and subject to the conditions contained in
the file COPYING.Google.
Portions of this file contain modifications contributed and copyrighted
by Percona Inc.. Those modifications are
gratefully acknowledged and are described briefly in the InnoDB
documentation. The contributions by Percona Inc. are incorporated with
their permission, and subject to the conditions contained in the file
COPYING.Percona.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file srv/srv0srv.cc
The database server main program
Created 10/8/1995 Heikki Tuuri
*******************************************************/
/* Dummy comment */
#include "srv0srv.h"
#include "ut0mem.h"
#include "ut0ut.h"
#include "os0proc.h"
#include "mem0mem.h"
#include "mem0pool.h"
#include "sync0sync.h"
#include "que0que.h"
#include "log0online.h"
#include "log0recv.h"
#include "pars0pars.h"
#include "usr0sess.h"
#include "lock0lock.h"
#include "trx0purge.h"
#include "ibuf0ibuf.h"
#include "buf0flu.h"
#include "buf0lru.h"
#include "btr0sea.h"
#include "dict0load.h"
#include "dict0boot.h"
#include "srv0start.h"
#include "row0mysql.h"
#include "row0log.h"
#include "ha_prototypes.h"
#include "trx0i_s.h"
#include "os0sync.h" /* for HAVE_ATOMIC_BUILTINS */
#include "srv0mon.h"
#include "ut0crc32.h"
#include "os0file.h"
#include "btr0defragment.h"
#include "mysql/plugin.h"
#include "mysql/service_thd_wait.h"
#include "fil0fil.h"
#include "fil0crypt.h"
#include "fil0pagecompress.h"
#include <my_rdtsc.h>
#include "btr0scrub.h"
/* prototypes for new functions added to ha_innodb.cc */
ibool innobase_get_slow_log();
/* The following counter is incremented whenever there is some user activity
in the server */
UNIV_INTERN ulint srv_activity_count = 0;
#include <my_service_manager.h>
#ifdef WITH_WSREP
extern int wsrep_debug;
extern int wsrep_trx_is_aborting(void *thd_ptr);
#endif
/* The following is the maximum allowed duration of a lock wait. */
UNIV_INTERN ulong srv_fatal_semaphore_wait_threshold = DEFAULT_SRV_FATAL_SEMAPHORE_TIMEOUT;
/**/
UNIV_INTERN long long srv_kill_idle_transaction = 0;
/* How much data manipulation language (DML) statements need to be delayed,
in microseconds, in order to reduce the lagging of the purge thread. */
UNIV_INTERN ulint srv_dml_needed_delay = 0;
UNIV_INTERN bool srv_monitor_active;
UNIV_INTERN bool srv_error_monitor_active;
UNIV_INTERN bool srv_buf_dump_thread_active;
UNIV_INTERN bool srv_dict_stats_thread_active;
UNIV_INTERN my_bool srv_scrub_log;
UNIV_INTERN const char* srv_main_thread_op_info = "";
/** Prefix used by MySQL to indicate pre-5.1 table name encoding */
const char srv_mysql50_table_name_prefix[10] = "#mysql50#";
/* Server parameters which are read from the initfile */
/* The following three are dir paths which are catenated before file
names, where the file name itself may also contain a path */
UNIV_INTERN char* srv_data_home = NULL;
/** Rollback files directory, can be absolute. */
UNIV_INTERN char* srv_undo_dir = NULL;
/** The number of tablespaces to use for rollback segments. */
UNIV_INTERN ulong srv_undo_tablespaces = 8;
/** The number of UNDO tablespaces that are open and ready to use. */
UNIV_INTERN ulint srv_undo_tablespaces_open = 8;
/* The number of rollback segments to use */
UNIV_INTERN ulong srv_undo_logs = 1;
#ifdef UNIV_LOG_ARCHIVE
UNIV_INTERN char* srv_arch_dir = NULL;
UNIV_INTERN ulong srv_log_arch_expire_sec = 0;
#endif /* UNIV_LOG_ARCHIVE */
/** Set if InnoDB must operate in read-only mode. We don't do any
recovery and open all tables in RO mode instead of RW mode. We don't
sync the max trx id to disk either. */
UNIV_INTERN my_bool srv_read_only_mode;
/** store to its own file each table created by an user; data
dictionary tables are in the system tablespace 0 */
UNIV_INTERN my_bool srv_file_per_table;
/** The file format to use on new *.ibd files. */
UNIV_INTERN ulint srv_file_format = 0;
/** Whether to check file format during startup. A value of
UNIV_FORMAT_MAX + 1 means no checking ie. FALSE. The default is to
set it to the highest format we support. */
UNIV_INTERN ulint srv_max_file_format_at_startup = UNIV_FORMAT_MAX;
/** Set if InnoDB operates in read-only mode or innodb-force-recovery
is greater than SRV_FORCE_NO_TRX_UNDO. */
UNIV_INTERN my_bool high_level_read_only;
#if UNIV_FORMAT_A
# error "UNIV_FORMAT_A must be 0!"
#endif
/** Place locks to records only i.e. do not use next-key locking except
on duplicate key checking and foreign key checking */
UNIV_INTERN ibool srv_locks_unsafe_for_binlog = FALSE;
/** Sort buffer size in index creation */
UNIV_INTERN ulong srv_sort_buf_size = 1048576;
/** Maximum modification log file size for online index creation */
UNIV_INTERN unsigned long long srv_online_max_size;
/* If this flag is TRUE, then we will use the native aio of the
OS (provided we compiled Innobase with it in), otherwise we will
use simulated aio we build below with threads.
Currently we support native aio on windows and linux */
/* make srv_use_native_aio to be visible for other plugins */
my_bool srv_use_native_aio = TRUE;
/* Default compression level if page compression is used and no compression
level is set for the table*/
UNIV_INTERN long srv_compress_zlib_level = 6;
/* If this flag is TRUE, then we will use fallocate(PUCH_HOLE)
to the pages */
UNIV_INTERN my_bool srv_use_trim = FALSE;
/* If this flag is TRUE, then we will use posix fallocate for file extentsion */
UNIV_INTERN my_bool srv_use_posix_fallocate = FALSE;
/* If this flag is TRUE, then we disable doublewrite buffer */
UNIV_INTERN my_bool srv_use_atomic_writes = FALSE;
/* If this flag IS TRUE, then we use this algorithm for page compressing the pages */
UNIV_INTERN ulong innodb_compression_algorithm = PAGE_ZLIB_ALGORITHM;
/* Number of threads used for multi-threaded flush */
UNIV_INTERN long srv_mtflush_threads = MTFLUSH_DEFAULT_WORKER;
/* If this flag is TRUE, then we will use multi threaded flush. */
UNIV_INTERN my_bool srv_use_mtflush = FALSE;
#ifdef __WIN__
/* Windows native condition variables. We use runtime loading / function
pointers, because they are not available on Windows Server 2003 and
Windows XP/2000.
We use condition for events on Windows if possible, even if os_event
resembles Windows kernel event object well API-wise. The reason is
performance, kernel objects are heavyweights and WaitForSingleObject() is a
performance killer causing calling thread to context switch. Besides, Innodb
is preallocating large number (often millions) of os_events. With kernel event
objects it takes a big chunk out of non-paged pool, which is better suited
for tasks like IO than for storing idle event objects. */
UNIV_INTERN ibool srv_use_native_conditions = TRUE;
#endif /* __WIN__ */
UNIV_INTERN ulint srv_n_data_files = 0;
UNIV_INTERN char** srv_data_file_names = NULL;
/* size in database pages */
UNIV_INTERN ulint* srv_data_file_sizes = NULL;
/** Whether the redo log tracking is currently enabled. Note that it is
possible for the log tracker thread to be running and the tracking to be
disabled */
UNIV_INTERN my_bool srv_track_changed_pages = FALSE;
UNIV_INTERN ulonglong srv_max_bitmap_file_size = 100 * 1024 * 1024;
UNIV_INTERN ulonglong srv_max_changed_pages = 0;
/** When TRUE, fake change transcations take S rather than X row locks.
When FALSE, row locks are not taken at all. */
UNIV_INTERN my_bool srv_fake_changes_locks = TRUE;
/* if TRUE, then we auto-extend the last data file */
UNIV_INTERN ibool srv_auto_extend_last_data_file = FALSE;
/* if != 0, this tells the max size auto-extending may increase the
last data file size */
UNIV_INTERN ulint srv_last_file_size_max = 0;
/* If the last data file is auto-extended, we add this
many pages to it at a time */
UNIV_INTERN ulong srv_auto_extend_increment = 8;
UNIV_INTERN ulint* srv_data_file_is_raw_partition = NULL;
/* If the following is TRUE we do not allow inserts etc. This protects
the user from forgetting the 'newraw' keyword to my.cnf */
UNIV_INTERN ibool srv_created_new_raw = FALSE;
UNIV_INTERN char* srv_log_group_home_dir = NULL;
UNIV_INTERN ulong srv_n_log_files = SRV_N_LOG_FILES_MAX;
/* size in database pages */
UNIV_INTERN ib_uint64_t srv_log_file_size = IB_UINT64_MAX;
UNIV_INTERN ib_uint64_t srv_log_file_size_requested;
/* size in database pages */
UNIV_INTERN ulint srv_log_buffer_size = ULINT_MAX;
UNIV_INTERN uint srv_flush_log_at_timeout = 1;
UNIV_INTERN ulong srv_page_size = UNIV_PAGE_SIZE_DEF;
UNIV_INTERN ulong srv_page_size_shift = UNIV_PAGE_SIZE_SHIFT_DEF;
UNIV_INTERN char srv_use_global_flush_log_at_trx_commit = TRUE;
/* Try to flush dirty pages so as to avoid IO bursts at
the checkpoints. */
UNIV_INTERN char srv_adaptive_flushing = TRUE;
UNIV_INTERN ulong srv_show_locks_held = 10;
UNIV_INTERN ulong srv_show_verbose_locks = 0;
/** Maximum number of times allowed to conditionally acquire
mutex before switching to blocking wait on the mutex */
#define MAX_MUTEX_NOWAIT 20
/** Check whether the number of failed nonblocking mutex
acquisition attempts exceeds maximum allowed value. If so,
srv_printf_innodb_monitor() will request mutex acquisition
with mutex_enter(), which will wait until it gets the mutex. */
#define MUTEX_NOWAIT(mutex_skipped) ((mutex_skipped) < MAX_MUTEX_NOWAIT)
#ifdef WITH_INNODB_DISALLOW_WRITES
UNIV_INTERN os_event_t srv_allow_writes_event;
#endif /* WITH_INNODB_DISALLOW_WRITES */
/** The sort order table of the MySQL latin1_swedish_ci character set
collation */
UNIV_INTERN const byte* srv_latin1_ordering;
/* use os/external memory allocator */
UNIV_INTERN my_bool srv_use_sys_malloc = TRUE;
/* requested size in kilobytes */
UNIV_INTERN ulint srv_buf_pool_size = ULINT_MAX;
/* requested number of buffer pool instances */
UNIV_INTERN ulint srv_buf_pool_instances = 1;
/* number of locks to protect buf_pool->page_hash */
UNIV_INTERN ulong srv_n_page_hash_locks = 16;
/** Scan depth for LRU flush batch i.e.: number of blocks scanned*/
UNIV_INTERN ulong srv_LRU_scan_depth = 1024;
/** whether or not to flush neighbors of a block */
UNIV_INTERN ulong srv_flush_neighbors = 1;
/* previously requested size */
UNIV_INTERN ulint srv_buf_pool_old_size;
/* current size in kilobytes */
UNIV_INTERN ulint srv_buf_pool_curr_size = 0;
/* dump that may % of each buffer pool during BP dump */
UNIV_INTERN ulong srv_buf_pool_dump_pct;
/* size in bytes */
UNIV_INTERN ulint srv_mem_pool_size = ULINT_MAX;
UNIV_INTERN ulint srv_lock_table_size = ULINT_MAX;
/* Defragmentation */
UNIV_INTERN my_bool srv_defragment = FALSE;
UNIV_INTERN uint srv_defragment_n_pages = 7;
UNIV_INTERN uint srv_defragment_stats_accuracy = 0;
UNIV_INTERN uint srv_defragment_fill_factor_n_recs = 20;
UNIV_INTERN double srv_defragment_fill_factor = 0.9;
UNIV_INTERN uint srv_defragment_frequency =
SRV_DEFRAGMENT_FREQUENCY_DEFAULT;
UNIV_INTERN ulonglong srv_defragment_interval = 0;
/** Query thread preflush algorithm */
UNIV_INTERN ulong srv_foreground_preflush
= SRV_FOREGROUND_PREFLUSH_EXP_BACKOFF;
/** The maximum time limit for a single LRU tail flush iteration by the page
cleaner thread */
UNIV_INTERN ulint srv_cleaner_max_lru_time = 1000;
/** The maximum time limit for a single flush list flush iteration by the page
cleaner thread */
UNIV_INTERN ulint srv_cleaner_max_flush_time = 1000;
/** Page cleaner flush list flush batches are further divided into this chunk
size */
UNIV_INTERN ulint srv_cleaner_flush_chunk_size = 100;
/** Page cleaner LRU list flush batches are further divided into this chunk
size */
UNIV_INTERN ulint srv_cleaner_lru_chunk_size = 100;
/** If free list length is lower than this percentage of srv_LRU_scan_depth,
page cleaner LRU flushes will issue flush batches to the same instance in a
row */
UNIV_INTERN ulint srv_cleaner_free_list_lwm = 10;
/** If TRUE, page cleaner heuristics use evicted instead of flushed page counts
for its heuristics */
UNIV_INTERN my_bool srv_cleaner_eviction_factor = FALSE;
/** Page cleaner LSN age factor formula option */
UNIV_INTERN ulong srv_cleaner_lsn_age_factor
= SRV_CLEANER_LSN_AGE_FACTOR_HIGH_CHECKPOINT;
/** Empty free list for a query thread handling algorithm option */
UNIV_INTERN ulong srv_empty_free_list_algorithm
= SRV_EMPTY_FREE_LIST_BACKOFF;
UNIV_INTERN ulong srv_idle_flush_pct = 100;
/* This parameter is deprecated. Use srv_n_io_[read|write]_threads
instead. */
UNIV_INTERN ulint srv_n_file_io_threads = ULINT_MAX;
UNIV_INTERN ulint srv_n_read_io_threads = ULINT_MAX;
UNIV_INTERN ulint srv_n_write_io_threads = ULINT_MAX;
/* Switch to enable random read ahead. */
UNIV_INTERN my_bool srv_random_read_ahead = FALSE;
/* The log block size */
UNIV_INTERN ulint srv_log_block_size = 0;
/* User settable value of the number of pages that must be present
in the buffer cache and accessed sequentially for InnoDB to trigger a
readahead request. */
UNIV_INTERN ulong srv_read_ahead_threshold = 56;
#ifdef UNIV_LOG_ARCHIVE
UNIV_INTERN bool srv_log_archive_on;
UNIV_INTERN bool srv_archive_recovery;
UNIV_INTERN ib_uint64_t srv_archive_recovery_limit_lsn;
#endif /* UNIV_LOG_ARCHIVE */
/* This parameter is used to throttle the number of insert buffers that are
merged in a batch. By increasing this parameter on a faster disk you can
possibly reduce the number of I/O operations performed to complete the
merge operation. The value of this parameter is used as is by the
background loop when the system is idle (low load), on a busy system
the parameter is scaled down by a factor of 4, this is to avoid putting
a heavier load on the I/O sub system. */
UNIV_INTERN ulong srv_insert_buffer_batch_size = 20;
UNIV_INTERN char* srv_file_flush_method_str = NULL;
UNIV_INTERN ulint srv_unix_file_flush_method = SRV_UNIX_FSYNC;
UNIV_INTERN ulint srv_win_file_flush_method = SRV_WIN_IO_UNBUFFERED;
UNIV_INTERN ulint srv_max_n_open_files = 300;
/* Number of IO operations per second the server can do */
UNIV_INTERN ulong srv_io_capacity = 200;
UNIV_INTERN ulong srv_max_io_capacity = 400;
/* The InnoDB main thread tries to keep the ratio of modified pages
in the buffer pool to all database pages in the buffer pool smaller than
the following number. But it is not guaranteed that the value stays below
that during a time of heavy update/insert activity. */
UNIV_INTERN double srv_max_buf_pool_modified_pct = 75.0;
UNIV_INTERN double srv_max_dirty_pages_pct_lwm = 50.0;
/* This is the percentage of log capacity at which adaptive flushing,
if enabled, will kick in. */
UNIV_INTERN double srv_adaptive_flushing_lwm = 10.0;
/* Number of iterations over which adaptive flushing is averaged. */
UNIV_INTERN ulong srv_flushing_avg_loops = 30;
/* The tid of the cleaner thread */
UNIV_INTERN os_tid_t srv_cleaner_tid;
/* The tid of the LRU manager thread */
UNIV_INTERN os_tid_t srv_lru_manager_tid;
/* The tids of the purge threads */
UNIV_INTERN os_tid_t srv_purge_tids[SRV_MAX_N_PURGE_THREADS];
/* The tids of the I/O threads */
UNIV_INTERN os_tid_t srv_io_tids[SRV_MAX_N_IO_THREADS];
/* The tid of the master thread */
UNIV_INTERN os_tid_t srv_master_tid;
/* The relative scheduling priority of the cleaner and LRU manager threads */
UNIV_INTERN ulint srv_sched_priority_cleaner = 19;
/* The relative scheduling priority of the purge threads */
UNIV_INTERN ulint srv_sched_priority_purge = 19;
/* The relative scheduling priority of the I/O threads */
UNIV_INTERN ulint srv_sched_priority_io = 19;
/* The relative scheduling priority of the master thread */
UNIV_INTERN ulint srv_sched_priority_master = 19;
/* The relative priority of the current thread. If 0, low priority; if 1, high
priority. */
UNIV_INTERN UNIV_THREAD_LOCAL ulint srv_current_thread_priority = 0;
/* The relative priority of the purge coordinator and worker threads. */
UNIV_INTERN my_bool srv_purge_thread_priority = FALSE;
/* The relative priority of the I/O threads. */
UNIV_INTERN my_bool srv_io_thread_priority = FALSE;
/* The relative priority of the cleaner thread. */
UNIV_INTERN my_bool srv_cleaner_thread_priority = FALSE;
/* The relative priority of the master thread. */
UNIV_INTERN my_bool srv_master_thread_priority = FALSE;
/* The number of purge threads to use.*/
UNIV_INTERN ulong srv_n_purge_threads;
/* the number of pages to purge in one batch */
UNIV_INTERN ulong srv_purge_batch_size = 20;
/* Internal setting for "innodb_stats_method". Decides how InnoDB treats
NULL value when collecting statistics. By default, it is set to
SRV_STATS_NULLS_EQUAL(0), ie. all NULL value are treated equal */
UNIV_INTERN ulong srv_innodb_stats_method = SRV_STATS_NULLS_EQUAL;
UNIV_INTERN srv_stats_t srv_stats;
/* structure to pass status variables to MySQL */
UNIV_INTERN export_var_t export_vars;
/** Normally 0. When nonzero, skip some phases of crash recovery,
starting from SRV_FORCE_IGNORE_CORRUPT, so that data can be recovered
by SELECT or mysqldump. When this is nonzero, we do not allow any user
modifications to the data. */
UNIV_INTERN ulong srv_force_recovery;
/** Print all user-level transactions deadlocks to mysqld stderr */
UNIV_INTERN my_bool srv_print_all_deadlocks = FALSE;
/* Produce a stacktrace on long semaphore wait */
UNIV_INTERN my_bool srv_use_stacktrace = FALSE;
/** Print lock wait timeout info to mysqld stderr */
my_bool srv_print_lock_wait_timeout_info = FALSE;
/** Enable INFORMATION_SCHEMA.innodb_cmp_per_index */
UNIV_INTERN my_bool srv_cmp_per_index_enabled = FALSE;
/* If the following is set to 1 then we do not run purge and insert buffer
merge to completion before shutdown. If it is set to 2, do not even flush the
buffer pool to data files at the shutdown: we effectively 'crash'
InnoDB (but lose no committed transactions). */
UNIV_INTERN ulint srv_fast_shutdown = 0;
/* Generate a innodb_status.<pid> file */
UNIV_INTERN ibool srv_innodb_status = FALSE;
/* Optimize prefix index queries to skip cluster index lookup when possible */
/* Enables or disables this prefix optimization. Disabled by default. */
UNIV_INTERN my_bool srv_prefix_index_cluster_optimization = 0;
/* When estimating number of different key values in an index, sample
this many index pages, there are 2 ways to calculate statistics:
* persistent stats that are calculated by ANALYZE TABLE and saved
in the innodb database.
* quick transient stats, that are used if persistent stats for the given
table/index are not found in the innodb database */
UNIV_INTERN unsigned long long srv_stats_transient_sample_pages = 8;
UNIV_INTERN my_bool srv_stats_persistent = TRUE;
UNIV_INTERN my_bool srv_stats_include_delete_marked = FALSE;
UNIV_INTERN unsigned long long srv_stats_persistent_sample_pages = 20;
UNIV_INTERN my_bool srv_stats_auto_recalc = TRUE;
/* The number of rows modified before we calculate new statistics (default 0
= current limits) */
UNIV_INTERN unsigned long long srv_stats_modified_counter = 0;
/* Enable traditional statistic calculation based on number of configured
pages default true. */
UNIV_INTERN my_bool srv_stats_sample_traditional = TRUE;
UNIV_INTERN ibool srv_use_doublewrite_buf = TRUE;
/** doublewrite buffer is 1MB is size i.e.: it can hold 128 16K pages.
The following parameter is the size of the buffer that is used for
batch flushing i.e.: LRU flushing and flush_list flushing. The rest
of the pages are used for single page flushing. */
UNIV_INTERN ulong srv_doublewrite_batch_size = 120;
UNIV_INTERN ulong srv_replication_delay = 0;
UNIV_INTERN bool srv_apply_log_only;
UNIV_INTERN bool srv_backup_mode;
UNIV_INTERN bool srv_close_files;
UNIV_INTERN bool srv_xtrabackup;
UNIV_INTERN ulong srv_pass_corrupt_table = 0; /* 0:disable 1:enable */
UNIV_INTERN ulong srv_log_checksum_algorithm =
SRV_CHECKSUM_ALGORITHM_INNODB;
/*-------------------------------------------*/
#ifdef HAVE_MEMORY_BARRIER
/* No idea to wait long with memory barriers */
UNIV_INTERN ulong srv_n_spin_wait_rounds = 15;
#else
UNIV_INTERN ulong srv_n_spin_wait_rounds = 30;
#endif
UNIV_INTERN ulong srv_spin_wait_delay = 6;
UNIV_INTERN ibool srv_priority_boost = TRUE;
#ifdef UNIV_DEBUG
UNIV_INTERN ibool srv_print_thread_releases = FALSE;
UNIV_INTERN ibool srv_print_lock_waits = FALSE;
UNIV_INTERN ibool srv_print_buf_io = FALSE;
UNIV_INTERN ibool srv_print_log_io = FALSE;
UNIV_INTERN ibool srv_print_latch_waits = FALSE;
#endif /* UNIV_DEBUG */
static ulint srv_n_rows_inserted_old = 0;
static ulint srv_n_rows_updated_old = 0;
static ulint srv_n_rows_deleted_old = 0;
static ulint srv_n_rows_read_old = 0;
static ulint srv_n_system_rows_inserted_old = 0;
static ulint srv_n_system_rows_updated_old = 0;
static ulint srv_n_system_rows_deleted_old = 0;
static ulint srv_n_system_rows_read_old = 0;
UNIV_INTERN ulint srv_truncated_status_writes = 0;
UNIV_INTERN ulint srv_available_undo_logs = 0;
/* Ensure status variables are on separate cache lines */
#define CACHE_ALIGNED MY_ATTRIBUTE((aligned (CACHE_LINE_SIZE)))
UNIV_INTERN byte
counters_pad_start[CACHE_LINE_SIZE] MY_ATTRIBUTE((unused)) = {0};
UNIV_INTERN ulint srv_read_views_memory CACHE_ALIGNED = 0;
UNIV_INTERN ulint srv_descriptors_memory CACHE_ALIGNED = 0;
UNIV_INTERN byte
counters_pad_end[CACHE_LINE_SIZE] MY_ATTRIBUTE((unused)) = {0};
/* Set the following to 0 if you want InnoDB to write messages on
stderr on startup/shutdown. */
UNIV_INTERN ibool srv_print_verbose_log = TRUE;
UNIV_INTERN my_bool srv_print_innodb_monitor = FALSE;
UNIV_INTERN my_bool srv_print_innodb_lock_monitor = FALSE;
UNIV_INTERN ibool srv_print_innodb_tablespace_monitor = FALSE;
UNIV_INTERN ibool srv_print_innodb_table_monitor = FALSE;
/** If this flag is set tables without primary key are not allowed */
UNIV_INTERN my_bool srv_force_primary_key = FALSE;
/* Array of English strings describing the current state of an
i/o handler thread */
UNIV_INTERN const char* srv_io_thread_op_info[SRV_MAX_N_IO_THREADS];
UNIV_INTERN const char* srv_io_thread_function[SRV_MAX_N_IO_THREADS];
UNIV_INTERN time_t srv_last_monitor_time;
static ib_mutex_t srv_innodb_monitor_mutex;
/* Mutex for locking srv_monitor_file. Not created if srv_read_only_mode */
UNIV_INTERN ib_mutex_t srv_monitor_file_mutex;
#ifdef UNIV_PFS_MUTEX
# ifndef HAVE_ATOMIC_BUILTINS
/* Key to register server_mutex with performance schema */
UNIV_INTERN mysql_pfs_key_t server_mutex_key;
# endif /* !HAVE_ATOMIC_BUILTINS */
/** Key to register srv_innodb_monitor_mutex with performance schema */
UNIV_INTERN mysql_pfs_key_t srv_innodb_monitor_mutex_key;
/** Key to register srv_monitor_file_mutex with performance schema */
UNIV_INTERN mysql_pfs_key_t srv_monitor_file_mutex_key;
/** Key to register srv_dict_tmpfile_mutex with performance schema */
UNIV_INTERN mysql_pfs_key_t srv_dict_tmpfile_mutex_key;
/** Key to register the mutex with performance schema */
UNIV_INTERN mysql_pfs_key_t srv_misc_tmpfile_mutex_key;
/** Key to register srv_sys_t::mutex with performance schema */
UNIV_INTERN mysql_pfs_key_t srv_sys_mutex_key;
/** Key to register srv_sys_t::tasks_mutex with performance schema */
UNIV_INTERN mysql_pfs_key_t srv_sys_tasks_mutex_key;
#endif /* UNIV_PFS_MUTEX */
/** Temporary file for innodb monitor output */
UNIV_INTERN FILE* srv_monitor_file;
/** Mutex for locking srv_dict_tmpfile. Not created if srv_read_only_mode.
This mutex has a very high rank; threads reserving it should not
be holding any InnoDB latches. */
UNIV_INTERN ib_mutex_t srv_dict_tmpfile_mutex;
/** Temporary file for output from the data dictionary */
UNIV_INTERN FILE* srv_dict_tmpfile;
/** Mutex for locking srv_misc_tmpfile. Not created if srv_read_only_mode.
This mutex has a very low rank; threads reserving it should not
acquire any further latches or sleep before releasing this one. */
UNIV_INTERN ib_mutex_t srv_misc_tmpfile_mutex;
/** Temporary file for miscellanous diagnostic output */
UNIV_INTERN FILE* srv_misc_tmpfile;
UNIV_INTERN ulint srv_main_thread_process_no = 0;
UNIV_INTERN ulint srv_main_thread_id = 0;
/* The following counts are used by the srv_master_thread. */
/** Iterations of the loop bounded by 'srv_active' label. */
static ulint srv_main_active_loops = 0;
/** Iterations of the loop bounded by the 'srv_idle' label. */
static ulint srv_main_idle_loops = 0;
/** Iterations of the loop bounded by the 'srv_shutdown' label. */
static ulint srv_main_shutdown_loops = 0;
/** Log writes involving flush. */
static ulint srv_log_writes_and_flush = 0;
/* This is only ever touched by the master thread. It records the
time when the last flush of log file has happened. The master
thread ensures that we flush the log files at least once per
second. */
static time_t srv_last_log_flush_time;
/** Enable semaphore request instrumentation */
UNIV_INTERN my_bool srv_instrument_semaphores = FALSE;
/* Interval in seconds at which various tasks are performed by the
master thread when server is active. In order to balance the workload,
we should try to keep intervals such that they are not multiple of
each other. For example, if we have intervals for various tasks
defined as 5, 10, 15, 60 then all tasks will be performed when
current_time % 60 == 0 and no tasks will be performed when
current_time % 5 != 0. */
# define SRV_MASTER_CHECKPOINT_INTERVAL (7)
# define SRV_MASTER_PURGE_INTERVAL (10)
#ifdef MEM_PERIODIC_CHECK
# define SRV_MASTER_MEM_VALIDATE_INTERVAL (13)
#endif /* MEM_PERIODIC_CHECK */
# define SRV_MASTER_DICT_LRU_INTERVAL (47)
/** Buffer pool dump status frequence in percentages */
UNIV_INTERN ulong srv_buf_dump_status_frequency = 0;
/** Acquire the system_mutex. */
#define srv_sys_mutex_enter() do { \
mutex_enter(&srv_sys.mutex); \
} while (0)
/** Test if the system mutex is owned. */
#define srv_sys_mutex_own() (mutex_own(&srv_sys.mutex) \
&& !srv_read_only_mode)
/** Release the system mutex. */
#define srv_sys_mutex_exit() do { \
mutex_exit(&srv_sys.mutex); \
} while (0)
#define fetch_lock_wait_timeout(trx) \
((trx)->lock.allowed_to_wait \
? thd_lock_wait_timeout((trx)->mysql_thd) \
: 0)
/** Simulate compression failures. */
UNIV_INTERN uint srv_simulate_comp_failures = 0;
/*
IMPLEMENTATION OF THE SERVER MAIN PROGRAM
=========================================
There is the following analogue between this database
server and an operating system kernel:
DB concept equivalent OS concept
---------- ---------------------
transaction -- process;
query thread -- thread;
lock -- semaphore;
kernel -- kernel;
query thread execution:
(a) without lock mutex
reserved -- process executing in user mode;
(b) with lock mutex reserved
-- process executing in kernel mode;
The server has several backgroind threads all running at the same
priority as user threads. It periodically checks if here is anything
happening in the server which requires intervention of the master
thread. Such situations may be, for example, when flushing of dirty
blocks is needed in the buffer pool or old version of database rows
have to be cleaned away (purged). The user can configure a separate
dedicated purge thread(s) too, in which case the master thread does not
do any purging.
The threads which we call user threads serve the queries of the MySQL
server. They run at normal priority.
When there is no activity in the system, also the master thread
suspends itself to wait for an event making the server totally silent.
There is still one complication in our server design. If a
background utility thread obtains a resource (e.g., mutex) needed by a user
thread, and there is also some other user activity in the system,
the user thread may have to wait indefinitely long for the
resource, as the OS does not schedule a background thread if
there is some other runnable user thread. This problem is called
priority inversion in real-time programming.
One solution to the priority inversion problem would be to keep record
of which thread owns which resource and in the above case boost the
priority of the background thread so that it will be scheduled and it
can release the resource. This solution is called priority inheritance
in real-time programming. A drawback of this solution is that the overhead
of acquiring a mutex increases slightly, maybe 0.2 microseconds on a 100
MHz Pentium, because the thread has to call os_thread_get_curr_id. This may
be compared to 0.5 microsecond overhead for a mutex lock-unlock pair. Note
that the thread cannot store the information in the resource , say mutex,
itself, because competing threads could wipe out the information if it is
stored before acquiring the mutex, and if it stored afterwards, the
information is outdated for the time of one machine instruction, at least.
(To be precise, the information could be stored to lock_word in mutex if
the machine supports atomic swap.)
The above solution with priority inheritance may become actual in the
future, currently we do not implement any priority twiddling solution.
Our general aim is to reduce the contention of all mutexes by making
them more fine grained.
The thread table contains information of the current status of each
thread existing in the system, and also the event semaphores used in
suspending the master thread and utility threads when they have nothing
to do. The thread table can be seen as an analogue to the process table
in a traditional Unix implementation. */
/** The server system struct */
struct srv_sys_t{
ib_mutex_t tasks_mutex; /*!< variable protecting the
tasks queue */
UT_LIST_BASE_NODE_T(que_thr_t)
tasks; /*!< task queue */
ib_mutex_t mutex; /*!< variable protecting the
fields below. */
ulint n_sys_threads; /*!< size of the sys_threads
array */
srv_slot_t sys_threads[32 + 1]; /*!< server thread table;
os_event_set() and
os_event_reset() on
sys_threads[]->event are
covered by srv_sys_t::mutex */
ulint n_threads_active[SRV_MASTER + 1];
/*!< number of threads active
in a thread class */
srv_stats_t::ulint_ctr_1_t
activity_count; /*!< For tracking server
activity */
srv_stats_t::ulint_ctr_1_t
ibuf_merge_activity_count;/*!< For tracking change
buffer merge activity, a subset
of overall server activity */
};
#ifndef HAVE_ATOMIC_BUILTINS
/** Mutex protecting some server global variables. */
UNIV_INTERN ib_mutex_t server_mutex;
#endif /* !HAVE_ATOMIC_BUILTINS */
static srv_sys_t srv_sys;
/** Event to signal srv_monitor_thread. Not protected by a mutex.
Set after setting srv_print_innodb_monitor. */
UNIV_INTERN os_event_t srv_monitor_event;
/** Event to signal the shutdown of srv_error_monitor_thread.
Not protected by a mutex. */
UNIV_INTERN os_event_t srv_error_event;
/** Event for waking up buf_dump_thread. Not protected by a mutex.
Set on shutdown or by buf_dump_start() or buf_load_start(). */
UNIV_INTERN os_event_t srv_buf_dump_event;
/** The buffer pool dump/load file name */
UNIV_INTERN char* srv_buf_dump_filename;
/** Boolean config knobs that tell InnoDB to dump the buffer pool at shutdown
and/or load it during startup. */
UNIV_INTERN char srv_buffer_pool_dump_at_shutdown = FALSE;
UNIV_INTERN char srv_buffer_pool_load_at_startup = FALSE;
/** Slot index in the srv_sys.sys_threads array for the purge thread. */
static const ulint SRV_PURGE_SLOT = 1;
/** Slot index in the srv_sys.sys_threads array for the master thread. */
static const ulint SRV_MASTER_SLOT = 0;
UNIV_INTERN os_event_t srv_checkpoint_completed_event;
UNIV_INTERN os_event_t srv_redo_log_tracked_event;
/** Whether the redo log tracker thread has been started. Does not take into
account whether the tracking is currently enabled (see srv_track_changed_pages
for that) */
UNIV_INTERN bool srv_redo_log_thread_started = false;
/*********************************************************************//**
Prints counters for work done by srv_master_thread. */
static
void
srv_print_master_thread_info(
/*=========================*/
FILE *file) /* in: output stream */
{
fprintf(file, "srv_master_thread loops: %lu srv_active, "
"%lu srv_shutdown, %lu srv_idle\n",
srv_main_active_loops,
srv_main_shutdown_loops,
srv_main_idle_loops);
fprintf(file, "srv_master_thread log flush and writes: %lu\n",
srv_log_writes_and_flush);
}
/*********************************************************************//**
Sets the info describing an i/o thread current state. */
UNIV_INTERN
void
srv_set_io_thread_op_info(
/*======================*/
ulint i, /*!< in: the 'segment' of the i/o thread */
const char* str) /*!< in: constant char string describing the
state */
{
ut_a(i < SRV_MAX_N_IO_THREADS);
srv_io_thread_op_info[i] = str;
}
/*********************************************************************//**
Resets the info describing an i/o thread current state. */
UNIV_INTERN
void
srv_reset_io_thread_op_info()
/*=========================*/
{
for (ulint i = 0; i < UT_ARR_SIZE(srv_io_thread_op_info); ++i) {
srv_io_thread_op_info[i] = "not started yet";
}
}
#ifdef UNIV_DEBUG
/*********************************************************************//**
Validates the type of a thread table slot.
@return TRUE if ok */
static
ibool
srv_thread_type_validate(
/*=====================*/
srv_thread_type type) /*!< in: thread type */
{
switch (type) {
case SRV_NONE:
break;
case SRV_WORKER:
case SRV_PURGE:
case SRV_MASTER:
return(TRUE);
}
ut_error;
return(FALSE);
}
#endif /* UNIV_DEBUG */
/*********************************************************************//**
Gets the type of a thread table slot.
@return thread type */
static
srv_thread_type
srv_slot_get_type(
/*==============*/
const srv_slot_t* slot) /*!< in: thread slot */
{
srv_thread_type type = slot->type;
ut_ad(srv_thread_type_validate(type));
return(type);
}
/*********************************************************************//**
Reserves a slot in the thread table for the current thread.
@return reserved slot */
static
srv_slot_t*
srv_reserve_slot(
/*=============*/
srv_thread_type type) /*!< in: type of the thread */
{
srv_slot_t* slot = 0;
srv_sys_mutex_enter();
ut_ad(srv_thread_type_validate(type));
switch (type) {
case SRV_MASTER:
slot = &srv_sys.sys_threads[SRV_MASTER_SLOT];
break;
case SRV_PURGE:
slot = &srv_sys.sys_threads[SRV_PURGE_SLOT];
break;
case SRV_WORKER:
/* Find an empty slot, skip the master and purge slots. */
for (slot = &srv_sys.sys_threads[2];
slot->in_use;
++slot) {
ut_a(slot < &srv_sys.sys_threads[
srv_sys.n_sys_threads]);
}
break;
case SRV_NONE:
ut_error;
}
ut_a(!slot->in_use);
slot->in_use = TRUE;
slot->suspended = FALSE;
slot->type = type;
ut_ad(srv_slot_get_type(slot) == type);
++srv_sys.n_threads_active[type];
srv_sys_mutex_exit();
return(slot);
}
/*********************************************************************//**
Suspends the calling thread to wait for the event in its thread slot.
@return the current signal count of the event. */
static
ib_int64_t
srv_suspend_thread_low(
/*===================*/
srv_slot_t* slot) /*!< in/out: thread slot */
{
ut_ad(!srv_read_only_mode);
ut_ad(srv_sys_mutex_own());
ut_ad(slot->in_use);
srv_thread_type type = srv_slot_get_type(slot);
switch (type) {
case SRV_NONE:
ut_error;
case SRV_MASTER:
/* We have only one master thread and it
should be the first entry always. */
ut_a(srv_sys.n_threads_active[type] == 1);
break;
case SRV_PURGE:
/* We have only one purge coordinator thread
and it should be the second entry always. */
ut_a(srv_sys.n_threads_active[type] == 1);
break;
case SRV_WORKER:
ut_a(srv_n_purge_threads > 1);
ut_a(srv_sys.n_threads_active[type] > 0);
break;
}
ut_a(!slot->suspended);
slot->suspended = TRUE;
ut_a(srv_sys.n_threads_active[type] > 0);
srv_sys.n_threads_active[type]--;
return(os_event_reset(slot->event));
}
/*********************************************************************//**
Suspends the calling thread to wait for the event in its thread slot.
@return the current signal count of the event. */
static
ib_int64_t
srv_suspend_thread(
/*===============*/
srv_slot_t* slot) /*!< in/out: thread slot */
{
srv_sys_mutex_enter();
ib_int64_t sig_count = srv_suspend_thread_low(slot);
srv_sys_mutex_exit();
return(sig_count);
}
/** Resume the calling thread.
@param[in,out] slot thread slot
@param[in] sig_count signal count (if wait)
@param[in] wait whether to wait for the event
@param[in] timeout_usec timeout in microseconds (0=infinite)
@return whether the wait timed out */
static
bool
srv_resume_thread(srv_slot_t* slot, ib_int64_t sig_count = 0, bool wait = true,
ulint timeout_usec = 0)
{
bool timeout;
ut_ad(!srv_read_only_mode);
ut_ad(slot->in_use);
ut_ad(slot->suspended);
if (!wait) {
timeout = false;
} else if (timeout_usec) {
timeout = OS_SYNC_TIME_EXCEEDED == os_event_wait_time_low(
slot->event, timeout_usec, sig_count);
} else {
timeout = false;
os_event_wait_low(slot->event, sig_count);
}
srv_sys_mutex_enter();
ut_ad(slot->in_use);
ut_ad(slot->suspended);
slot->suspended = FALSE;
++srv_sys.n_threads_active[slot->type];
srv_sys_mutex_exit();
return(timeout);
}
/** Ensure that a given number of threads of the type given are running
(or are already terminated).
@param[in] type thread type
@param[in] n number of threads that have to run */
void
srv_release_threads(enum srv_thread_type type, ulint n)
{
ulint running;
ut_ad(srv_thread_type_validate(type));
ut_ad(n > 0);
do {
running = 0;
srv_sys_mutex_enter();
for (ulint i = 0; i < srv_sys.n_sys_threads; i++) {
srv_slot_t* slot = &srv_sys.sys_threads[i];
if (!slot->in_use || srv_slot_get_type(slot) != type) {
continue;
} else if (!slot->suspended) {
if (++running >= n) {
break;
}
continue;
}
switch (type) {
case SRV_NONE:
ut_error;
case SRV_MASTER:
/* We have only one master thread and it
should be the first entry always. */
ut_a(n == 1);
ut_a(i == SRV_MASTER_SLOT);
ut_a(srv_sys.n_threads_active[type] == 0);
break;
case SRV_PURGE:
/* We have only one purge coordinator thread
and it should be the second entry always. */
ut_a(n == 1);
ut_a(i == SRV_PURGE_SLOT);
ut_a(srv_n_purge_threads > 0);
ut_a(srv_sys.n_threads_active[type] == 0);
break;
case SRV_WORKER:
ut_a(srv_n_purge_threads > 1);
ut_a(srv_sys.n_threads_active[type]
< srv_n_purge_threads - 1);
break;
}
os_event_set(slot->event);
}
srv_sys_mutex_exit();
} while (running && running < n);
}
/*********************************************************************//**
Release a thread's slot. */
static
void
srv_free_slot(
/*==========*/
srv_slot_t* slot) /*!< in/out: thread slot */
{
srv_sys_mutex_enter();
/* Mark the thread as inactive. */
srv_suspend_thread_low(slot);
/* Free the slot for reuse. */
ut_ad(slot->in_use);
slot->in_use = FALSE;
srv_sys_mutex_exit();
}
/*********************************************************************//**
Initializes the server. */
UNIV_INTERN
void
srv_init(void)
/*==========*/
{
#ifndef HAVE_ATOMIC_BUILTINS
mutex_create(server_mutex_key, &server_mutex, SYNC_ANY_LATCH);
#endif /* !HAVE_ATOMIC_BUILTINS */
mutex_create(srv_innodb_monitor_mutex_key,
&srv_innodb_monitor_mutex, SYNC_NO_ORDER_CHECK);
srv_sys.n_sys_threads = srv_read_only_mode
? 0
: srv_n_purge_threads + 1/* purge coordinator */;
if (!srv_read_only_mode) {
mutex_create(srv_sys_mutex_key, &srv_sys.mutex, SYNC_THREADS);
mutex_create(srv_sys_tasks_mutex_key,
&srv_sys.tasks_mutex, SYNC_ANY_LATCH);
for (ulint i = 0; i < srv_sys.n_sys_threads; ++i) {
srv_slot_t* slot = &srv_sys.sys_threads[i];
slot->event = os_event_create();
ut_a(slot->event);
}
srv_error_event = os_event_create();
srv_monitor_event = os_event_create();
srv_buf_dump_event = os_event_create();
srv_checkpoint_completed_event = os_event_create();
srv_redo_log_tracked_event = os_event_create();
if (srv_track_changed_pages) {
os_event_set(srv_redo_log_tracked_event);
}
}
/* page_zip_stat_per_index_mutex is acquired from:
1. page_zip_compress() (after SYNC_FSP)
2. page_zip_decompress()
3. i_s_cmp_per_index_fill_low() (where SYNC_DICT is acquired)
4. innodb_cmp_per_index_update(), no other latches
since we do not acquire any other latches while holding this mutex,
it can have very low level. We pick SYNC_ANY_LATCH for it. */
mutex_create(
page_zip_stat_per_index_mutex_key,
&page_zip_stat_per_index_mutex, SYNC_ANY_LATCH);
/* Create dummy indexes for infimum and supremum records */
dict_ind_init();
srv_conc_init();
#ifdef WITH_INNODB_DISALLOW_WRITES
/* Writes have to be enabled on init or else we hang. Thus, we
always set the event here regardless of innobase_disallow_writes.
That flag will always be 0 at this point because it isn't settable
via my.cnf or command line arg. */
srv_allow_writes_event = os_event_create();
os_event_set(srv_allow_writes_event);
#endif /* WITH_INNODB_DISALLOW_WRITES */
/* Initialize some INFORMATION SCHEMA internal structures */
trx_i_s_cache_init(trx_i_s_cache);
ut_crc32_init();
dict_mem_init();
}
/*********************************************************************//**
Frees the data structures created in srv_init(). */
UNIV_INTERN
void
srv_free(void)
/*==========*/
{
srv_conc_free();
if (!srv_read_only_mode) {
for (ulint i = 0; i < srv_sys.n_sys_threads; i++)
os_event_free(srv_sys.sys_threads[i].event);
os_event_free(srv_error_event);
srv_error_event = NULL;
os_event_free(srv_monitor_event);
srv_monitor_event = NULL;
os_event_free(srv_buf_dump_event);
srv_buf_dump_event = NULL;
os_event_free(srv_checkpoint_completed_event);
srv_checkpoint_completed_event = NULL;
os_event_free(srv_redo_log_tracked_event);
srv_redo_log_tracked_event = NULL;
mutex_free(&srv_sys.mutex);
mutex_free(&srv_sys.tasks_mutex);
}
#ifdef WITH_INNODB_DISALLOW_WRITES
os_event_free(srv_allow_writes_event);
srv_allow_writes_event = NULL;
#endif /* WITH_INNODB_DISALLOW_WRITES */
#ifndef HAVE_ATOMIC_BUILTINS
mutex_free(&server_mutex);
#endif
mutex_free(&srv_innodb_monitor_mutex);
mutex_free(&page_zip_stat_per_index_mutex);
trx_i_s_cache_free(trx_i_s_cache);
/* This is needed for Mariabackup. */
memset(&srv_sys, 0, sizeof srv_sys);
}
/*********************************************************************//**
Initializes the synchronization primitives, memory system, and the thread
local storage. */
UNIV_INTERN
void
srv_general_init(void)
/*==================*/
{
ut_mem_init();
/* Reset the system variables in the recovery module. */
recv_sys_var_init();
os_sync_init();
sync_init();
mem_init(srv_mem_pool_size);
que_init();
row_mysql_init();
}
/*********************************************************************//**
Normalizes init parameter values to use units we use inside InnoDB. */
static
void
srv_normalize_init_values(void)
/*===========================*/
{
ulint n;
ulint i;
n = srv_n_data_files;
for (i = 0; i < n; i++) {
srv_data_file_sizes[i] = srv_data_file_sizes[i]
* ((1024 * 1024) / UNIV_PAGE_SIZE);
}
srv_last_file_size_max = srv_last_file_size_max
* ((1024 * 1024) / UNIV_PAGE_SIZE);
srv_log_file_size = srv_log_file_size / UNIV_PAGE_SIZE;
srv_log_buffer_size = srv_log_buffer_size / UNIV_PAGE_SIZE;
srv_lock_table_size = 5 * (srv_buf_pool_size / UNIV_PAGE_SIZE);
}
/*********************************************************************//**
Boots the InnoDB server. */
UNIV_INTERN
void
srv_boot(void)
/*==========*/
{
/* Transform the init parameter values given by MySQL to
use units we use inside InnoDB: */
srv_normalize_init_values();
/* Initialize synchronization primitives, memory management, and thread
local storage */
srv_general_init();
/* Initialize this module */
srv_init();
srv_mon_create();
}
/******************************************************************//**
Refreshes the values used to calculate per-second averages. */
static
void
srv_refresh_innodb_monitor_stats(void)
/*==================================*/
{
mutex_enter(&srv_innodb_monitor_mutex);
srv_last_monitor_time = time(NULL);
os_aio_refresh_stats();
btr_cur_n_sea_old = btr_cur_n_sea;
btr_cur_n_non_sea_old = btr_cur_n_non_sea;
log_refresh_stats();
buf_refresh_io_stats_all();
srv_n_rows_inserted_old = srv_stats.n_rows_inserted;
srv_n_rows_updated_old = srv_stats.n_rows_updated;
srv_n_rows_deleted_old = srv_stats.n_rows_deleted;
srv_n_rows_read_old = srv_stats.n_rows_read;
srv_n_system_rows_inserted_old = srv_stats.n_system_rows_inserted;
srv_n_system_rows_updated_old = srv_stats.n_system_rows_updated;
srv_n_system_rows_deleted_old = srv_stats.n_system_rows_deleted;
srv_n_system_rows_read_old = srv_stats.n_system_rows_read;
mutex_exit(&srv_innodb_monitor_mutex);
}
/******************************************************************//**
Outputs to a file the output of the InnoDB Monitor.
@return FALSE if not all information printed
due to failure to obtain necessary mutex */
UNIV_INTERN
ibool
srv_printf_innodb_monitor(
/*======================*/
FILE* file, /*!< in: output stream */
ibool nowait, /*!< in: whether to wait for the
lock_sys_t:: mutex */
ulint* trx_start_pos, /*!< out: file position of the start of
the list of active transactions */
ulint* trx_end) /*!< out: file position of the end of
the list of active transactions */
{
double time_elapsed;
time_t current_time;
ulint n_reserved;
ibool ret;
ulong btr_search_sys_constant;
ulong btr_search_sys_variable;
ulint lock_sys_subtotal;
ulint recv_sys_subtotal;
ulint i;
trx_t* trx;
mutex_enter(&srv_innodb_monitor_mutex);
current_time = time(NULL);
/* We add 0.001 seconds to time_elapsed to prevent division
by zero if two users happen to call SHOW ENGINE INNODB STATUS at the
same time */
time_elapsed = difftime(current_time, srv_last_monitor_time)
+ 0.001;
srv_last_monitor_time = time(NULL);
fputs("\n=====================================\n", file);
ut_print_timestamp(file);
fprintf(file,
" INNODB MONITOR OUTPUT\n"
"=====================================\n"
"Per second averages calculated from the last %lu seconds\n",
(ulong) time_elapsed);
fputs("-----------------\n"
"BACKGROUND THREAD\n"
"-----------------\n", file);
srv_print_master_thread_info(file);
fputs("----------\n"
"SEMAPHORES\n"
"----------\n", file);
sync_print(file);
/* Conceptually, srv_innodb_monitor_mutex has a very high latching
order level in sync0sync.h, while dict_foreign_err_mutex has a very
low level 135. Therefore we can reserve the latter mutex here without
a danger of a deadlock of threads. */
if (!recv_recovery_on) {
mutex_enter(&dict_foreign_err_mutex);
if (!srv_read_only_mode
&& ftell(dict_foreign_err_file) != 0L) {
fputs("------------------------\n"
"LATEST FOREIGN KEY ERROR\n"
"------------------------\n", file);
ut_copy_file(file, dict_foreign_err_file);
}
mutex_exit(&dict_foreign_err_mutex);
}
/* Only if lock_print_info_summary proceeds correctly,
before we call the lock_print_info_all_transactions
to print all the lock information. IMPORTANT NOTE: This
function acquires the lock mutex on success. */
ret = recv_recovery_on ? FALSE : lock_print_info_summary(file, nowait);
if (ret) {
if (trx_start_pos) {
long t = ftell(file);
if (t < 0) {
*trx_start_pos = ULINT_UNDEFINED;
} else {
*trx_start_pos = (ulint) t;
}
}
/* NOTE: If we get here then we have the lock mutex. This
function will release the lock mutex that we acquired when
we called the lock_print_info_summary() function earlier. */
lock_print_info_all_transactions(file);
if (trx_end) {
long t = ftell(file);
if (t < 0) {
*trx_end = ULINT_UNDEFINED;
} else {
*trx_end = (ulint) t;
}
}
}
fputs("--------\n"
"FILE I/O\n"
"--------\n", file);
os_aio_print(file);
if (!recv_recovery_on) {
fputs("-------------------------------------\n"
"INSERT BUFFER AND ADAPTIVE HASH INDEX\n"
"-------------------------------------\n", file);
ibuf_print(file);
}
fprintf(file,
"%.2f hash searches/s, %.2f non-hash searches/s\n",
(btr_cur_n_sea - btr_cur_n_sea_old)
/ time_elapsed,
(btr_cur_n_non_sea - btr_cur_n_non_sea_old)
/ time_elapsed);
btr_cur_n_sea_old = btr_cur_n_sea;
btr_cur_n_non_sea_old = btr_cur_n_non_sea;
if (!recv_recovery_on) {
fputs("---\n"
"LOG\n"
"---\n", file);
log_print(file);
}
fputs("----------------------\n"
"BUFFER POOL AND MEMORY\n"
"----------------------\n", file);
fprintf(file,
"Total memory allocated " ULINTPF
"; in additional pool allocated " ULINTPF "\n",
ut_total_allocated_memory,
mem_pool_get_reserved(mem_comm_pool));
fprintf(file,
"Total memory allocated by read views " ULINTPF "\n",
os_atomic_increment_ulint(&srv_read_views_memory, 0));
/* Calculate AHI constant and variable memory allocations */
btr_search_sys_constant = 0;
btr_search_sys_variable = 0;
ut_ad(btr_search_sys->hash_tables);
for (i = 0; i < btr_search_index_num; i++) {
hash_table_t* ht = btr_search_sys->hash_tables[i];
ut_ad(ht);
ut_ad(ht->heap);
/* Multiple mutexes/heaps are currently never used for adaptive
hash index tables. */
ut_ad(!ht->n_sync_obj);
ut_ad(!ht->heaps);
btr_search_sys_variable += mem_heap_get_size(ht->heap);
btr_search_sys_constant += ht->n_cells * sizeof(hash_cell_t);
}
lock_sys_subtotal = 0;
if (trx_sys) {
mutex_enter(&trx_sys->mutex);
trx = UT_LIST_GET_FIRST(trx_sys->mysql_trx_list);
while (trx) {
lock_sys_subtotal
+= ((trx->lock.lock_heap)
? mem_heap_get_size(trx->lock.lock_heap)
: 0);
trx = UT_LIST_GET_NEXT(mysql_trx_list, trx);
}
mutex_exit(&trx_sys->mutex);
}
recv_sys_subtotal = ((recv_sys && recv_sys->addr_hash)
? mem_heap_get_size(recv_sys->heap) : 0);
ulint dict_size = dict_sys ? dict_sys_get_size() : 0;
fprintf(file,
"Internal hash tables (constant factor + variable factor)\n"
" Adaptive hash index %lu \t(%lu + " ULINTPF ")\n"
" Page hash %lu (buffer pool 0 only)\n"
" Dictionary cache %lu \t(%lu + " ULINTPF ")\n"
" File system %lu \t(%lu + " ULINTPF ")\n"
" Lock system %lu \t(%lu + " ULINTPF ")\n"
" Recovery system %lu \t(%lu + " ULINTPF ")\n",
btr_search_sys_constant + btr_search_sys_variable,
btr_search_sys_constant,
btr_search_sys_variable,
(ulong) (buf_pool_from_array(0)->page_hash->n_cells * sizeof(hash_cell_t)),
(ulong) (dict_sys ? ((dict_sys->table_hash->n_cells
+ dict_sys->table_id_hash->n_cells
) * sizeof(hash_cell_t)
+ dict_size) : 0),
(ulong) (dict_sys ? ((dict_sys->table_hash->n_cells
+ dict_sys->table_id_hash->n_cells
) * sizeof(hash_cell_t)) : 0),
dict_size,
(ulong) (fil_system_hash_cells() * sizeof(hash_cell_t)
+ fil_system_hash_nodes()),
(ulong) (fil_system_hash_cells() * sizeof(hash_cell_t)),
fil_system_hash_nodes(),
(ulong) ((lock_sys ? (lock_sys->rec_hash->n_cells * sizeof(hash_cell_t)) : 0)
+ lock_sys_subtotal),
(ulong) (lock_sys ? (lock_sys->rec_hash->n_cells * sizeof(hash_cell_t)) : 0),
lock_sys_subtotal,
(ulong) (((recv_sys && recv_sys->addr_hash)
? (recv_sys->addr_hash->n_cells * sizeof(hash_cell_t)) : 0)
+ recv_sys_subtotal),
(ulong) ((recv_sys && recv_sys->addr_hash)
? (recv_sys->addr_hash->n_cells * sizeof(hash_cell_t)) : 0),
recv_sys_subtotal);
fprintf(file, "Dictionary memory allocated " ULINTPF "\n", dict_size);
buf_print_io(file);
fputs("--------------\n"
"ROW OPERATIONS\n"
"--------------\n", file);
fprintf(file, "%ld queries inside InnoDB, %lu queries in queue\n",
(long) srv_conc_get_active_threads(),
srv_conc_get_waiting_threads());
mutex_enter(&trx_sys->mutex);
fprintf(file, "%lu read views open inside InnoDB\n",
UT_LIST_GET_LEN(trx_sys->view_list));
fprintf(file, "%lu RW transactions active inside InnoDB\n",
UT_LIST_GET_LEN(trx_sys->rw_trx_list));
fprintf(file, "%lu RO transactions active inside InnoDB\n",
UT_LIST_GET_LEN(trx_sys->ro_trx_list));
fprintf(file, "%lu out of %lu descriptors used\n",
trx_sys->descr_n_used, trx_sys->descr_n_max);
if (UT_LIST_GET_LEN(trx_sys->view_list)) {
read_view_t* view = UT_LIST_GET_LAST(trx_sys->view_list);
if (view) {
fprintf(file, "---OLDEST VIEW---\n");
read_view_print(file, view);
fprintf(file, "-----------------\n");
}
}
mutex_exit(&trx_sys->mutex);
n_reserved = fil_space_get_n_reserved_extents(0);
if (n_reserved > 0) {
fprintf(file,
"%lu tablespace extents now reserved for"
" B-tree split operations\n",
(ulong) n_reserved);
}
#ifdef UNIV_LINUX
fprintf(file, "Main thread process no. %lu, id %lu, state: %s\n",
(ulong) srv_main_thread_process_no,
(ulong) srv_main_thread_id,
srv_main_thread_op_info);
#else
fprintf(file, "Main thread id %lu, state: %s\n",
(ulong) srv_main_thread_id,
srv_main_thread_op_info);
#endif
fprintf(file,
"Number of rows inserted " ULINTPF
", updated " ULINTPF ", deleted " ULINTPF
", read " ULINTPF "\n",
(ulint) srv_stats.n_rows_inserted,
(ulint) srv_stats.n_rows_updated,
(ulint) srv_stats.n_rows_deleted,
(ulint) srv_stats.n_rows_read);
fprintf(file,
"%.2f inserts/s, %.2f updates/s,"
" %.2f deletes/s, %.2f reads/s\n",
((ulint) srv_stats.n_rows_inserted - srv_n_rows_inserted_old)
/ time_elapsed,
((ulint) srv_stats.n_rows_updated - srv_n_rows_updated_old)
/ time_elapsed,
((ulint) srv_stats.n_rows_deleted - srv_n_rows_deleted_old)
/ time_elapsed,
((ulint) srv_stats.n_rows_read - srv_n_rows_read_old)
/ time_elapsed);
fprintf(file,
"Number of system rows inserted " ULINTPF
", updated " ULINTPF ", deleted " ULINTPF
", read " ULINTPF "\n",
(ulint) srv_stats.n_system_rows_inserted,
(ulint) srv_stats.n_system_rows_updated,
(ulint) srv_stats.n_system_rows_deleted,
(ulint) srv_stats.n_system_rows_read);
fprintf(file,
"%.2f inserts/s, %.2f updates/s,"
" %.2f deletes/s, %.2f reads/s\n",
((ulint) srv_stats.n_system_rows_inserted
- srv_n_system_rows_inserted_old) / time_elapsed,
((ulint) srv_stats.n_system_rows_updated
- srv_n_system_rows_updated_old) / time_elapsed,
((ulint) srv_stats.n_system_rows_deleted
- srv_n_system_rows_deleted_old) / time_elapsed,
((ulint) srv_stats.n_system_rows_read
- srv_n_system_rows_read_old) / time_elapsed);
srv_n_rows_inserted_old = srv_stats.n_rows_inserted;
srv_n_rows_updated_old = srv_stats.n_rows_updated;
srv_n_rows_deleted_old = srv_stats.n_rows_deleted;
srv_n_rows_read_old = srv_stats.n_rows_read;
srv_n_system_rows_inserted_old = srv_stats.n_system_rows_inserted;
srv_n_system_rows_updated_old = srv_stats.n_system_rows_updated;
srv_n_system_rows_deleted_old = srv_stats.n_system_rows_deleted;
srv_n_system_rows_read_old = srv_stats.n_system_rows_read;
fputs("----------------------------\n"
"END OF INNODB MONITOR OUTPUT\n"
"============================\n", file);
mutex_exit(&srv_innodb_monitor_mutex);
fflush(file);
#ifndef DBUG_OFF
srv_debug_monitor_printed = true;
#endif
return(ret);
}
/******************************************************************//**
Function to pass InnoDB status variables to MySQL */
UNIV_INTERN
void
srv_export_innodb_status(void)
/*==========================*/
{
buf_pool_stat_t stat;
buf_pools_list_size_t buf_pools_list_size;
ulint LRU_len;
ulint free_len;
ulint flush_list_len;
ulint mem_adaptive_hash, mem_dictionary;
read_view_t* oldest_view;
ulint i;
fil_crypt_stat_t crypt_stat;
btr_scrub_stat_t scrub_stat;
buf_get_total_stat(&stat);
buf_get_total_list_len(&LRU_len, &free_len, &flush_list_len);
buf_get_total_list_size_in_bytes(&buf_pools_list_size);
if (!srv_read_only_mode) {
fil_crypt_total_stat(&crypt_stat);
btr_scrub_total_stat(&scrub_stat);
}
mem_adaptive_hash = 0;
ut_ad(btr_search_sys->hash_tables);
for (i = 0; i < btr_search_index_num; i++) {
hash_table_t* ht = btr_search_sys->hash_tables[i];
ut_ad(ht);
ut_ad(ht->heap);
/* Multiple mutexes/heaps are currently never used for adaptive
hash index tables. */
ut_ad(!ht->n_sync_obj);
ut_ad(!ht->heaps);
mem_adaptive_hash += mem_heap_get_size(ht->heap);
mem_adaptive_hash += ht->n_cells * sizeof(hash_cell_t);
}
mem_dictionary = (dict_sys ? ((dict_sys->table_hash->n_cells
+ dict_sys->table_id_hash->n_cells
) * sizeof(hash_cell_t)
+ dict_sys_get_size()) : 0);
mutex_enter(&srv_innodb_monitor_mutex);
export_vars.innodb_data_pending_reads =
ulint(MONITOR_VALUE(MONITOR_OS_PENDING_READS));
export_vars.innodb_data_pending_writes =
ulint(MONITOR_VALUE(MONITOR_OS_PENDING_WRITES));
export_vars.innodb_data_pending_fsyncs =
fil_n_pending_log_flushes
+ fil_n_pending_tablespace_flushes;
export_vars.innodb_adaptive_hash_hash_searches
= btr_cur_n_sea;
export_vars.innodb_adaptive_hash_non_hash_searches
= btr_cur_n_non_sea;
export_vars.innodb_background_log_sync
= srv_log_writes_and_flush;
export_vars.innodb_data_fsyncs = os_n_fsyncs;
export_vars.innodb_data_read = srv_stats.data_read;
export_vars.innodb_data_reads = os_n_file_reads;
export_vars.innodb_data_writes = os_n_file_writes;
export_vars.innodb_data_written = srv_stats.data_written;
export_vars.innodb_buffer_pool_read_requests = stat.n_page_gets;
export_vars.innodb_buffer_pool_write_requests =
srv_stats.buf_pool_write_requests;
export_vars.innodb_buffer_pool_wait_free =
srv_stats.buf_pool_wait_free;
export_vars.innodb_buffer_pool_pages_flushed =
srv_stats.buf_pool_flushed;
export_vars.innodb_buffer_pool_reads = srv_stats.buf_pool_reads;
export_vars.innodb_buffer_pool_read_ahead_rnd =
stat.n_ra_pages_read_rnd;
export_vars.innodb_buffer_pool_read_ahead =
stat.n_ra_pages_read;
export_vars.innodb_buffer_pool_read_ahead_evicted =
stat.n_ra_pages_evicted;
export_vars.innodb_buffer_pool_pages_LRU_flushed =
stat.buf_lru_flush_page_count;
export_vars.innodb_buffer_pool_pages_data = LRU_len;
export_vars.innodb_buffer_pool_bytes_data =
buf_pools_list_size.LRU_bytes
+ buf_pools_list_size.unzip_LRU_bytes;
export_vars.innodb_buffer_pool_pages_dirty = flush_list_len;
export_vars.innodb_buffer_pool_bytes_dirty =
buf_pools_list_size.flush_list_bytes;
export_vars.innodb_buffer_pool_pages_free = free_len;
export_vars.innodb_deadlocks = srv_stats.lock_deadlock_count;
#ifdef UNIV_DEBUG
export_vars.innodb_buffer_pool_pages_latched =
buf_get_latched_pages_number();
#endif /* UNIV_DEBUG */
export_vars.innodb_buffer_pool_pages_total = buf_pool_get_n_pages();
export_vars.innodb_buffer_pool_pages_misc =
buf_pool_get_n_pages() - LRU_len - free_len;
export_vars.innodb_buffer_pool_pages_made_young
= stat.n_pages_made_young;
export_vars.innodb_buffer_pool_pages_made_not_young
= stat.n_pages_not_made_young;
export_vars.innodb_buffer_pool_pages_old = 0;
for (i = 0; i < srv_buf_pool_instances; i++) {
buf_pool_t* buf_pool = buf_pool_from_array(i);
export_vars.innodb_buffer_pool_pages_old
+= buf_pool->LRU_old_len;
}
export_vars.innodb_checkpoint_age
= (log_sys->lsn - log_sys->last_checkpoint_lsn);
export_vars.innodb_checkpoint_max_age
= log_sys->max_checkpoint_age;
export_vars.innodb_history_list_length
= trx_sys->rseg_history_len;
ibuf_export_ibuf_status(
&export_vars.innodb_ibuf_size,
&export_vars.innodb_ibuf_free_list,
&export_vars.innodb_ibuf_segment_size,
&export_vars.innodb_ibuf_merges,
&export_vars.innodb_ibuf_merged_inserts,
&export_vars.innodb_ibuf_merged_delete_marks,
&export_vars.innodb_ibuf_merged_deletes,
&export_vars.innodb_ibuf_discarded_inserts,
&export_vars.innodb_ibuf_discarded_delete_marks,
&export_vars.innodb_ibuf_discarded_deletes);
export_vars.innodb_lsn_current
= log_sys->lsn;
export_vars.innodb_lsn_flushed
= log_sys->flushed_to_disk_lsn;
export_vars.innodb_lsn_last_checkpoint
= log_sys->last_checkpoint_lsn;
export_vars.innodb_master_thread_active_loops
= srv_main_active_loops;
export_vars.innodb_master_thread_idle_loops
= srv_main_idle_loops;
export_vars.innodb_max_trx_id
= trx_sys->max_trx_id;
export_vars.innodb_mem_adaptive_hash
= mem_adaptive_hash;
export_vars.innodb_mem_dictionary
= mem_dictionary;
export_vars.innodb_mem_total
= ut_total_allocated_memory;
export_vars.innodb_mutex_os_waits
= mutex_os_wait_count;
export_vars.innodb_mutex_spin_rounds
= mutex_spin_round_count;
export_vars.innodb_mutex_spin_waits
= mutex_spin_wait_count;
export_vars.innodb_s_lock_os_waits
= rw_lock_stats.rw_s_os_wait_count;
export_vars.innodb_s_lock_spin_rounds
= rw_lock_stats.rw_s_spin_round_count;
export_vars.innodb_s_lock_spin_waits
= rw_lock_stats.rw_s_spin_wait_count;
export_vars.innodb_x_lock_os_waits
= rw_lock_stats.rw_x_os_wait_count;
export_vars.innodb_x_lock_spin_rounds
= rw_lock_stats.rw_x_spin_round_count;
export_vars.innodb_x_lock_spin_waits
= rw_lock_stats.rw_x_spin_wait_count;
oldest_view = UT_LIST_GET_LAST(trx_sys->view_list);
export_vars.innodb_oldest_view_low_limit_trx_id
= oldest_view ? oldest_view->low_limit_id : 0;
export_vars.innodb_purge_trx_id = purge_sys->limit.trx_no;
export_vars.innodb_purge_undo_no = purge_sys->limit.undo_no;
export_vars.innodb_current_row_locks
= lock_sys->rec_num;
#ifdef HAVE_ATOMIC_BUILTINS
export_vars.innodb_have_atomic_builtins = 1;
#else
export_vars.innodb_have_atomic_builtins = 0;
#endif
export_vars.innodb_page_size = UNIV_PAGE_SIZE;
export_vars.innodb_log_waits = srv_stats.log_waits;
export_vars.innodb_os_log_written = srv_stats.os_log_written;
export_vars.innodb_os_log_fsyncs = fil_n_log_flushes;
export_vars.innodb_os_log_pending_fsyncs = fil_n_pending_log_flushes;
export_vars.innodb_os_log_pending_writes =
srv_stats.os_log_pending_writes;
export_vars.innodb_log_write_requests = srv_stats.log_write_requests;
export_vars.innodb_log_writes = srv_stats.log_writes;
export_vars.innodb_dblwr_pages_written =
srv_stats.dblwr_pages_written;
export_vars.innodb_dblwr_writes = srv_stats.dblwr_writes;
export_vars.innodb_pages_created = stat.n_pages_created;
export_vars.innodb_pages_read = stat.n_pages_read;
export_vars.innodb_page0_read = srv_stats.page0_read;
export_vars.innodb_pages_written = stat.n_pages_written;
export_vars.innodb_row_lock_waits = srv_stats.n_lock_wait_count;
export_vars.innodb_row_lock_current_waits =
srv_stats.n_lock_wait_current_count;
export_vars.innodb_row_lock_time = srv_stats.n_lock_wait_time / 1000;
if (srv_stats.n_lock_wait_count > 0) {
export_vars.innodb_row_lock_time_avg = (ulint)
(srv_stats.n_lock_wait_time
/ 1000 / srv_stats.n_lock_wait_count);
} else {
export_vars.innodb_row_lock_time_avg = 0;
}
export_vars.innodb_row_lock_time_max =
lock_sys->n_lock_max_wait_time / 1000;
export_vars.innodb_rows_read = srv_stats.n_rows_read;
export_vars.innodb_rows_inserted = srv_stats.n_rows_inserted;
export_vars.innodb_rows_updated = srv_stats.n_rows_updated;
export_vars.innodb_rows_deleted = srv_stats.n_rows_deleted;
export_vars.innodb_system_rows_read = srv_stats.n_system_rows_read;
export_vars.innodb_system_rows_inserted =
srv_stats.n_system_rows_inserted;
export_vars.innodb_system_rows_updated =
srv_stats.n_system_rows_updated;
export_vars.innodb_system_rows_deleted =
srv_stats.n_system_rows_deleted;
export_vars.innodb_num_open_files = fil_n_file_opened;
export_vars.innodb_truncated_status_writes =
srv_truncated_status_writes;
export_vars.innodb_available_undo_logs = srv_available_undo_logs;
export_vars.innodb_read_views_memory
= os_atomic_increment_ulint(&srv_read_views_memory, 0);
export_vars.innodb_descriptors_memory
= os_atomic_increment_ulint(&srv_descriptors_memory, 0);
export_vars.innodb_page_compression_saved = srv_stats.page_compression_saved;
export_vars.innodb_page_compression_trim_sect512 = srv_stats.page_compression_trim_sect512;
export_vars.innodb_page_compression_trim_sect4096 = srv_stats.page_compression_trim_sect4096;
export_vars.innodb_index_pages_written = srv_stats.index_pages_written;
export_vars.innodb_non_index_pages_written = srv_stats.non_index_pages_written;
export_vars.innodb_pages_page_compressed = srv_stats.pages_page_compressed;
export_vars.innodb_page_compressed_trim_op = srv_stats.page_compressed_trim_op;
export_vars.innodb_page_compressed_trim_op_saved = srv_stats.page_compressed_trim_op_saved;
export_vars.innodb_pages_page_decompressed = srv_stats.pages_page_decompressed;
export_vars.innodb_pages_page_compression_error = srv_stats.pages_page_compression_error;
export_vars.innodb_pages_decrypted = srv_stats.pages_decrypted;
export_vars.innodb_pages_encrypted = srv_stats.pages_encrypted;
export_vars.innodb_n_merge_blocks_encrypted = srv_stats.n_merge_blocks_encrypted;
export_vars.innodb_n_merge_blocks_decrypted = srv_stats.n_merge_blocks_decrypted;
export_vars.innodb_n_rowlog_blocks_encrypted = srv_stats.n_rowlog_blocks_encrypted;
export_vars.innodb_n_rowlog_blocks_decrypted = srv_stats.n_rowlog_blocks_decrypted;
export_vars.innodb_defragment_compression_failures =
btr_defragment_compression_failures;
export_vars.innodb_defragment_failures = btr_defragment_failures;
export_vars.innodb_defragment_count = btr_defragment_count;
export_vars.innodb_onlineddl_rowlog_rows = onlineddl_rowlog_rows;
export_vars.innodb_onlineddl_rowlog_pct_used = onlineddl_rowlog_pct_used;
export_vars.innodb_onlineddl_pct_progress = onlineddl_pct_progress;
#ifdef UNIV_DEBUG
rw_lock_s_lock(&purge_sys->latch);
trx_id_t done_trx_no = purge_sys->done.trx_no;
trx_id_t up_limit_id = purge_sys->view
? purge_sys->view->up_limit_id
: 0;
rw_lock_s_unlock(&purge_sys->latch);
mutex_enter(&trx_sys->mutex);
trx_id_t max_trx_id = trx_sys->rw_max_trx_id;
mutex_exit(&trx_sys->mutex);
if (!done_trx_no || max_trx_id < done_trx_no - 1) {
export_vars.innodb_purge_trx_id_age = 0;
} else {
export_vars.innodb_purge_trx_id_age =
(ulint) (max_trx_id - done_trx_no + 1);
}
if (!up_limit_id
|| max_trx_id < up_limit_id) {
export_vars.innodb_purge_view_trx_id_age = 0;
} else {
export_vars.innodb_purge_view_trx_id_age =
(ulint) (max_trx_id - up_limit_id);
}
#endif /* UNIV_DEBUG */
export_vars.innodb_sec_rec_cluster_reads =
srv_stats.n_sec_rec_cluster_reads;
export_vars.innodb_sec_rec_cluster_reads_avoided =
srv_stats.n_sec_rec_cluster_reads_avoided;
if (!srv_read_only_mode) {
export_vars.innodb_encryption_rotation_pages_read_from_cache =
crypt_stat.pages_read_from_cache;
export_vars.innodb_encryption_rotation_pages_read_from_disk =
crypt_stat.pages_read_from_disk;
export_vars.innodb_encryption_rotation_pages_modified =
crypt_stat.pages_modified;
export_vars.innodb_encryption_rotation_pages_flushed =
crypt_stat.pages_flushed;
export_vars.innodb_encryption_rotation_estimated_iops =
crypt_stat.estimated_iops;
export_vars.innodb_encryption_key_requests =
srv_stats.n_key_requests;
export_vars.innodb_key_rotation_list_length =
srv_stats.key_rotation_list_length;
export_vars.innodb_scrub_page_reorganizations =
scrub_stat.page_reorganizations;
export_vars.innodb_scrub_page_splits =
scrub_stat.page_splits;
export_vars.innodb_scrub_page_split_failures_underflow =
scrub_stat.page_split_failures_underflow;
export_vars.innodb_scrub_page_split_failures_out_of_filespace =
scrub_stat.page_split_failures_out_of_filespace;
export_vars.innodb_scrub_page_split_failures_missing_index =
scrub_stat.page_split_failures_missing_index;
export_vars.innodb_scrub_page_split_failures_unknown =
scrub_stat.page_split_failures_unknown;
}
export_vars.innodb_buffered_aio_submitted =
srv_stats.n_aio_submitted;
mutex_exit(&srv_innodb_monitor_mutex);
}
#ifndef DBUG_OFF
/** false before InnoDB monitor has been printed at least once, true
afterwards */
bool srv_debug_monitor_printed = false;
#endif
/*********************************************************************//**
A thread which prints the info output by various InnoDB monitors.
@return a dummy parameter */
extern "C" UNIV_INTERN
os_thread_ret_t
DECLARE_THREAD(srv_monitor_thread)(void*)
{
ib_int64_t sig_count;
double time_elapsed;
time_t current_time;
time_t last_table_monitor_time;
time_t last_tablespace_monitor_time;
time_t last_monitor_time;
ulint mutex_skipped;
ibool last_srv_print_monitor;
ut_ad(!srv_read_only_mode);
#ifdef UNIV_DEBUG_THREAD_CREATION
fprintf(stderr, "Lock timeout thread starts, id %lu\n",
os_thread_pf(os_thread_get_curr_id()));
#endif /* UNIV_DEBUG_THREAD_CREATION */
#ifdef UNIV_PFS_THREAD
pfs_register_thread(srv_monitor_thread_key);
#endif /* UNIV_PFS_THREAD */
srv_last_monitor_time = ut_time();
last_table_monitor_time = ut_time();
last_tablespace_monitor_time = ut_time();
last_monitor_time = ut_time();
mutex_skipped = 0;
last_srv_print_monitor = srv_print_innodb_monitor;
loop:
/* Wake up every 5 seconds to see if we need to print
monitor information or if signalled at shutdown. */
sig_count = os_event_reset(srv_monitor_event);
os_event_wait_time_low(srv_monitor_event, 5000000, sig_count);
current_time = ut_time();
time_elapsed = difftime(current_time, last_monitor_time);
if (time_elapsed > 15) {
last_monitor_time = ut_time();
if (srv_print_innodb_monitor) {
/* Reset mutex_skipped counter everytime
srv_print_innodb_monitor changes. This is to
ensure we will not be blocked by lock_sys->mutex
for short duration information printing,
such as requested by sync_array_print_long_waits() */
if (!last_srv_print_monitor) {
mutex_skipped = 0;
last_srv_print_monitor = TRUE;
}
if (!srv_printf_innodb_monitor(stderr,
MUTEX_NOWAIT(mutex_skipped),
NULL, NULL)) {
mutex_skipped++;
} else {
/* Reset the counter */
mutex_skipped = 0;
}
} else {
last_srv_print_monitor = FALSE;
}
/* We don't create the temp files or associated
mutexes in read-only-mode */
if (!srv_read_only_mode && srv_innodb_status) {
mutex_enter(&srv_monitor_file_mutex);
rewind(srv_monitor_file);
if (!srv_printf_innodb_monitor(srv_monitor_file,
MUTEX_NOWAIT(mutex_skipped),
NULL, NULL)) {
mutex_skipped++;
} else {
mutex_skipped = 0;
}
os_file_set_eof(srv_monitor_file);
mutex_exit(&srv_monitor_file_mutex);
}
if (srv_print_innodb_tablespace_monitor
&& difftime(current_time,
last_tablespace_monitor_time) > 60) {
last_tablespace_monitor_time = ut_time();
fputs("========================"
"========================\n",
stderr);
ut_print_timestamp(stderr);
fputs(" INNODB TABLESPACE MONITOR OUTPUT\n"
"========================"
"========================\n",
stderr);
fsp_print(0);
fputs("Validating tablespace\n", stderr);
fsp_validate(0);
fputs("Validation ok\n"
"---------------------------------------\n"
"END OF INNODB TABLESPACE MONITOR OUTPUT\n"
"=======================================\n",
stderr);
}
if (srv_print_innodb_table_monitor
&& difftime(current_time, last_table_monitor_time) > 60) {
last_table_monitor_time = ut_time();
fprintf(stderr, "Warning: %s\n",
DEPRECATED_MSG_INNODB_TABLE_MONITOR);
fputs("===========================================\n",
stderr);
ut_print_timestamp(stderr);
fputs(" INNODB TABLE MONITOR OUTPUT\n"
"===========================================\n",
stderr);
dict_print();
fputs("-----------------------------------\n"
"END OF INNODB TABLE MONITOR OUTPUT\n"
"==================================\n",
stderr);
fprintf(stderr, "Warning: %s\n",
DEPRECATED_MSG_INNODB_TABLE_MONITOR);
}
}
if (srv_shutdown_state != SRV_SHUTDOWN_NONE) {
goto exit_func;
}
if (srv_print_innodb_monitor
|| srv_print_innodb_lock_monitor
|| srv_print_innodb_tablespace_monitor
|| srv_print_innodb_table_monitor) {
goto loop;
}
goto loop;
exit_func:
srv_monitor_active = false;
/* We count the number of threads in os_thread_exit(). A created
thread should always use that to exit and not use return() to exit. */
os_thread_exit(NULL);
OS_THREAD_DUMMY_RETURN;
}
/*********************************************************************//**
A thread which prints warnings about semaphore waits which have lasted
too long. These can be used to track bugs which cause hangs.
Note: In order to make sync_arr_wake_threads_if_sema_free work as expected,
we should avoid waiting any mutexes in this function!
@return a dummy parameter */
extern "C" UNIV_INTERN
os_thread_ret_t
DECLARE_THREAD(srv_error_monitor_thread)(void*)
{
/* number of successive fatal timeouts observed */
ulint fatal_cnt = 0;
lsn_t old_lsn;
lsn_t new_lsn;
ib_int64_t sig_count;
/* longest waiting thread for a semaphore */
os_thread_id_t waiter = os_thread_get_curr_id();
os_thread_id_t old_waiter = waiter;
/* the semaphore that is being waited for */
const void* sema = NULL;
const void* old_sema = NULL;
ut_ad(!srv_read_only_mode);
old_lsn = srv_start_lsn;
#ifdef UNIV_DEBUG_THREAD_CREATION
fprintf(stderr, "Error monitor thread starts, id %lu\n",
os_thread_pf(os_thread_get_curr_id()));
#endif /* UNIV_DEBUG_THREAD_CREATION */
#ifdef UNIV_PFS_THREAD
pfs_register_thread(srv_error_monitor_thread_key);
#endif /* UNIV_PFS_THREAD */
loop:
/* Try to track a strange bug reported by Harald Fuchs and others,
where the lsn seems to decrease at times */
if (log_peek_lsn(&new_lsn)) {
if (new_lsn < old_lsn) {
ut_print_timestamp(stderr);
fprintf(stderr,
" InnoDB: Error: old log sequence number " LSN_PF
" was greater\n"
"InnoDB: than the new log sequence number " LSN_PF "!\n"
"InnoDB: Please submit a bug report"
" to https://jira.mariadb.org\n",
old_lsn, new_lsn);
ut_ad(0);
}
old_lsn = new_lsn;
}
if (difftime(time(NULL), srv_last_monitor_time) > 60) {
/* We referesh InnoDB Monitor values so that averages are
printed from at most 60 last seconds */
srv_refresh_innodb_monitor_stats();
}
/* Update the statistics collected for deciding LRU
eviction policy. */
buf_LRU_stat_update();
/* In case mutex_exit is not a memory barrier, it is
theoretically possible some threads are left waiting though
the semaphore is already released. Wake up those threads: */
sync_arr_wake_threads_if_sema_free();
if (sync_array_print_long_waits(&waiter, &sema)
&& sema == old_sema && os_thread_eq(waiter, old_waiter)) {
#if defined(WITH_WSREP) && defined(WITH_INNODB_DISALLOW_WRITES)
if (srv_allow_writes_event->is_set()) {
#endif /* WITH_WSREP */
fatal_cnt++;
#if defined(WITH_WSREP) && defined(WITH_INNODB_DISALLOW_WRITES)
} else {
fprintf(stderr,
"WSREP: avoiding InnoDB self crash due to long "
"semaphore wait of > %lu seconds\n"
"Server is processing SST donor operation, "
"fatal_cnt now: %lu",
(ulong) srv_fatal_semaphore_wait_threshold, fatal_cnt);
}
#endif /* WITH_WSREP */
if (fatal_cnt > 10) {
fprintf(stderr,
"InnoDB: Error: semaphore wait has lasted"
" > %lu seconds\n"
"InnoDB: We intentionally crash the server,"
" because it appears to be hung.\n",
(ulong) srv_fatal_semaphore_wait_threshold);
ut_error;
}
} else {
fatal_cnt = 0;
old_waiter = waiter;
old_sema = sema;
}
/* Flush stderr so that a database user gets the output
to possible MySQL error file */
fflush(stderr);
sig_count = os_event_reset(srv_error_event);
os_event_wait_time_low(srv_error_event, 1000000, sig_count);
if (srv_shutdown_state == SRV_SHUTDOWN_NONE) {
goto loop;
}
srv_error_monitor_active = false;
/* We count the number of threads in os_thread_exit(). A created
thread should always use that to exit and not use return() to exit. */
os_thread_exit(NULL);
OS_THREAD_DUMMY_RETURN;
}
/******************************************************************//**
Increment the server activity count. */
UNIV_INTERN
void
srv_inc_activity_count(
/*===================*/
bool ibuf_merge_activity) /*!< whether this activity bump
is caused by the background
change buffer merge */
{
srv_sys.activity_count.inc();
if (ibuf_merge_activity)
srv_sys.ibuf_merge_activity_count.inc();
}
/**********************************************************************//**
Check whether any background thread is active. If so return the thread
type.
@return SRV_NONE if all are suspended or have exited, thread
type if any are still active. */
UNIV_INTERN
srv_thread_type
srv_get_active_thread_type(void)
/*============================*/
{
srv_thread_type ret = SRV_NONE;
if (srv_read_only_mode || srv_apply_log_only) {
return(SRV_NONE);
}
srv_sys_mutex_enter();
for (ulint i = SRV_WORKER; i <= SRV_MASTER; ++i) {
if (srv_sys.n_threads_active[i] != 0) {
ret = static_cast<srv_thread_type>(i);
break;
}
}
srv_sys_mutex_exit();
/* Check only on shutdown. */
if (ret == SRV_NONE
&& srv_shutdown_state != SRV_SHUTDOWN_NONE
&& trx_purge_state() != PURGE_STATE_DISABLED
&& trx_purge_state() != PURGE_STATE_EXIT) {
ret = SRV_PURGE;
}
return(ret);
}
/******************************************************************//**
A thread which follows the redo log and outputs the changed page bitmap.
@return a dummy value */
extern "C" UNIV_INTERN
os_thread_ret_t
DECLARE_THREAD(srv_redo_log_follow_thread)(
/*=======================================*/
void* arg MY_ATTRIBUTE((unused))) /*!< in: a dummy parameter
required by
os_thread_create */
{
ut_ad(!srv_read_only_mode);
#ifdef UNIV_DEBUG_THREAD_CREATION
fprintf(stderr, "Redo log follower thread starts, id %lu\n",
os_thread_pf(os_thread_get_curr_id()));
#endif
#ifdef UNIV_PFS_THREAD
pfs_register_thread(srv_log_tracking_thread_key);
#endif
my_thread_init();
srv_redo_log_thread_started = true;
do {
os_event_wait(srv_checkpoint_completed_event);
os_event_reset(srv_checkpoint_completed_event);
if (srv_track_changed_pages
&& srv_shutdown_state < SRV_SHUTDOWN_LAST_PHASE) {
if (!log_online_follow_redo_log()) {
/* TODO: sync with I_S log tracking status? */
ib_logf(IB_LOG_LEVEL_ERROR,
"log tracking bitmap write failed, "
"stopping log tracking thread!");
break;
}
os_event_set(srv_redo_log_tracked_event);
}
} while (srv_shutdown_state < SRV_SHUTDOWN_LAST_PHASE);
log_online_read_shutdown();
os_event_set(srv_redo_log_tracked_event);
my_thread_end();
os_thread_exit(NULL);
OS_THREAD_DUMMY_RETURN;
}
/*************************************************************//**
Removes old archived transaction log files.
Both parameters couldn't be provided at the same time */
dberr_t
purge_archived_logs(
time_t before_date, /*!< in: all files modified
before timestamp should be removed */
lsn_t before_no) /*!< in: files with this number in name
and earler should be removed */
{
log_group_t* group = UT_LIST_GET_FIRST(log_sys->log_groups);
os_file_dir_t dir;
os_file_stat_t fileinfo;
char archived_log_filename[OS_FILE_MAX_PATH];
char namegen[OS_FILE_MAX_PATH];
ulint dirnamelen;
if (srv_arch_dir) {
dir = os_file_opendir(srv_arch_dir, FALSE);
if (!dir) {
ib_logf(IB_LOG_LEVEL_WARN,
"opening archived log directory %s failed. "
"Purge archived logs are not available",
srv_arch_dir);
/* failed to open directory */
return(DB_ERROR);
}
} else {
/* log archive directory is not specified */
return(DB_ERROR);
}
dirnamelen = strlen(srv_arch_dir);
memcpy(archived_log_filename, srv_arch_dir, dirnamelen);
if (dirnamelen &&
archived_log_filename[dirnamelen - 1] != SRV_PATH_SEPARATOR) {
archived_log_filename[dirnamelen++] = SRV_PATH_SEPARATOR;
}
memset(&fileinfo, 0, sizeof(fileinfo));
while(!os_file_readdir_next_file(srv_arch_dir, dir,
&fileinfo) ) {
if (strncmp(fileinfo.name,
IB_ARCHIVED_LOGS_PREFIX, IB_ARCHIVED_LOGS_PREFIX_LEN)) {
continue;
}
if (dirnamelen + strlen(fileinfo.name) + 2 > OS_FILE_MAX_PATH)
continue;
snprintf(archived_log_filename + dirnamelen,
OS_FILE_MAX_PATH - dirnamelen - 1,
"%s", fileinfo.name);
if (before_no) {
ib_uint64_t log_file_no = strtoull(fileinfo.name +
IB_ARCHIVED_LOGS_PREFIX_LEN,
NULL, 10);
if (log_file_no == 0 || before_no <= log_file_no) {
continue;
}
} else {
fileinfo.mtime = 0;
if (os_file_get_status(archived_log_filename,
&fileinfo, false) != DB_SUCCESS ||
fileinfo.mtime == 0) {
continue;
}
if (before_date == 0 || fileinfo.mtime > before_date) {
continue;
}
}
/* We are going to delete archived file. Acquire log_sys->mutex
to make sure that we are the only who try to delete file. This
also prevents log system from using this file. Do not delete
file if it is currently in progress of writting or have
pending IO. This is enforced by checking:
1. fil_space_contains_node.
2. group->archived_offset % group->file_size != 0, i.e.
there is archive in progress and we are going to delete it.
This covers 3 cases:
a. Usual case when we have one archive in progress,
both 1 and 2 are TRUE
b. When we have more then 1 archive in fil_space,
this can happen when flushed LSN range crosses file
boundary
c. When we have empty fil_space, but existing file will be
opened once archiving operation is requested. This usually
happens on startup.
*/
mutex_enter(&log_sys->mutex);
log_archived_file_name_gen(namegen, sizeof(namegen),
group->id, group->archived_file_no);
if (fil_space_contains_node(group->archive_space_id,
archived_log_filename) ||
(group->archived_offset % group->file_size != 0 &&
strcmp(namegen, archived_log_filename) == 0)) {
mutex_exit(&log_sys->mutex);
continue;
}
if (!os_file_delete_if_exists(innodb_file_data_key,
archived_log_filename)) {
ib_logf(IB_LOG_LEVEL_WARN,
"can't delete archived log file %s.",
archived_log_filename);
mutex_exit(&log_sys->mutex);
os_file_closedir(dir);
return(DB_ERROR);
}
mutex_exit(&log_sys->mutex);
}
os_file_closedir(dir);
return(DB_SUCCESS);
}
/*******************************************************************//**
Tells the InnoDB server that there has been activity in the database
and wakes up the master thread if it is suspended (not sleeping). Used
in the MySQL interface. Note that there is a small chance that the master
thread stays suspended (we do not protect our operation with the
srv_sys_t->mutex, for performance reasons). */
UNIV_INTERN
void
srv_active_wake_master_thread(void)
/*===============================*/
{
if (srv_read_only_mode) {
return;
}
ut_ad(!srv_sys_mutex_own());
srv_inc_activity_count();
if (srv_sys.n_threads_active[SRV_MASTER] == 0) {
srv_slot_t* slot;
srv_sys_mutex_enter();
slot = &srv_sys.sys_threads[SRV_MASTER_SLOT];
/* Only if the master thread has been started. */
if (slot->in_use) {
ut_a(srv_slot_get_type(slot) == SRV_MASTER);
os_event_set(slot->event);
}
srv_sys_mutex_exit();
}
}
/*******************************************************************//**
Tells the purge thread that there has been activity in the database
and wakes up the purge thread if it is suspended (not sleeping). Note
that there is a small chance that the purge thread stays suspended
(we do not protect our check with the srv_sys_t:mutex and the
purge_sys->latch, for performance reasons). */
UNIV_INTERN
void
srv_wake_purge_thread_if_not_active(void)
/*=====================================*/
{
ut_ad(!srv_sys_mutex_own());
if (purge_sys->state == PURGE_STATE_RUN
&& srv_sys.n_threads_active[SRV_PURGE] == 0) {
srv_release_threads(SRV_PURGE, 1);
}
}
/*******************************************************************//**
Wakes up the master thread if it is suspended or being suspended. */
UNIV_INTERN
void
srv_wake_master_thread(void)
/*========================*/
{
ut_ad(!srv_sys_mutex_own());
srv_inc_activity_count();
srv_release_threads(SRV_MASTER, 1);
}
/*******************************************************************//**
Get current server activity count. We don't hold srv_sys::mutex while
reading this value as it is only used in heuristics.
@return activity count. */
UNIV_INTERN
ulint
srv_get_activity_count(void)
/*========================*/
{
return(srv_sys.activity_count);
}
/** Get current server ibuf merge activity count.
@return ibuf merge activity count */
static
ulint
srv_get_ibuf_merge_activity_count(void)
{
return(srv_sys.ibuf_merge_activity_count);
}
/*******************************************************************//**
Check if there has been any activity. Considers background change buffer
merge as regular server activity unless a non-default
old_ibuf_merge_activity_count value is passed, in which case the merge will be
treated as keeping server idle.
@return FALSE if no change in activity counter. */
UNIV_INTERN
ibool
srv_check_activity(
/*===============*/
ulint old_activity_count, /*!< in: old activity count */
/*!< old change buffer merge
activity count, or
ULINT_UNDEFINED */
ulint old_ibuf_merge_activity_count)
{
ulint new_activity_count = srv_sys.activity_count;
if (old_ibuf_merge_activity_count == ULINT_UNDEFINED)
return(new_activity_count != old_activity_count);
/* If we care about ibuf merge activity, then the server is considered
idle if all activity, if any, was due to ibuf merge. */
ulint new_ibuf_merge_activity_count
= srv_sys.ibuf_merge_activity_count;
ut_ad(new_ibuf_merge_activity_count <= new_activity_count);
ut_ad(new_ibuf_merge_activity_count >= old_ibuf_merge_activity_count);
ut_ad(new_activity_count >= old_activity_count);
ulint ibuf_merge_activity_delta =
new_ibuf_merge_activity_count - old_ibuf_merge_activity_count;
ulint activity_delta = new_activity_count - old_activity_count;
return (activity_delta > ibuf_merge_activity_delta);
}
/********************************************************************//**
The master thread is tasked to ensure that flush of log file happens
once every second in the background. This is to ensure that not more
than one second of trxs are lost in case of crash when
innodb_flush_logs_at_trx_commit != 1 */
static
void
srv_sync_log_buffer_in_background(void)
/*===================================*/
{
time_t current_time = time(NULL);
srv_main_thread_op_info = "flushing log";
if (difftime(current_time, srv_last_log_flush_time)
>= srv_flush_log_at_timeout) {
log_buffer_sync_in_background(TRUE);
srv_last_log_flush_time = current_time;
srv_log_writes_and_flush++;
}
}
/********************************************************************//**
Make room in the table cache by evicting an unused table.
@return number of tables evicted. */
static
ulint
srv_master_evict_from_table_cache(
/*==============================*/
ulint pct_check) /*!< in: max percent to check */
{
ulint n_tables_evicted = 0;
rw_lock_x_lock(&dict_operation_lock);
dict_mutex_enter_for_mysql();
n_tables_evicted = dict_make_room_in_cache(
innobase_get_table_cache_size(), pct_check);
dict_mutex_exit_for_mysql();
rw_lock_x_unlock(&dict_operation_lock);
return(n_tables_evicted);
}
/*********************************************************************//**
This function prints progress message every 60 seconds during server
shutdown, for any activities that master thread is pending on. */
static
void
srv_shutdown_print_master_pending(
/*==============================*/
ib_time_t* last_print_time, /*!< last time the function
print the message */
ulint n_tables_to_drop, /*!< number of tables to
be dropped */
ulint n_bytes_merged) /*!< number of change buffer
just merged */
{
ib_time_t current_time;
double time_elapsed;
current_time = ut_time();
time_elapsed = ut_difftime(current_time, *last_print_time);
if (time_elapsed > 60) {
*last_print_time = current_time;
if (n_tables_to_drop) {
ut_print_timestamp(stderr);
fprintf(stderr, " InnoDB: Waiting for "
"%lu table(s) to be dropped\n",
(ulong) n_tables_to_drop);
}
/* Check change buffer merge, we only wait for change buffer
merge if it is a slow shutdown */
if (!srv_fast_shutdown && n_bytes_merged) {
ut_print_timestamp(stderr);
fprintf(stderr, " InnoDB: Waiting for change "
"buffer merge to complete\n"
" InnoDB: number of bytes of change buffer "
"just merged: %lu\n",
n_bytes_merged);
}
}
}
/*********************************************************************//**
Perform the tasks that the master thread is supposed to do when the
server is active. There are two types of tasks. The first category is
of such tasks which are performed at each inovcation of this function.
We assume that this function is called roughly every second when the
server is active. The second category is of such tasks which are
performed at some interval e.g.: purge, dict_LRU cleanup etc. */
static
void
srv_master_do_active_tasks(void)
/*============================*/
{
ib_time_t cur_time = ut_time();
ullint counter_time = ut_time_us(NULL);
ulint n_evicted = 0;
/* First do the tasks that we are suppose to do at each
invocation of this function. */
++srv_main_active_loops;
MONITOR_INC(MONITOR_MASTER_ACTIVE_LOOPS);
/* ALTER TABLE in MySQL requires on Unix that the table handler
can drop tables lazily after there no longer are SELECT
queries to them. */
srv_main_thread_op_info = "doing background drop tables";
row_drop_tables_for_mysql_in_background();
MONITOR_INC_TIME_IN_MICRO_SECS(
MONITOR_SRV_BACKGROUND_DROP_TABLE_MICROSECOND, counter_time);
if (srv_shutdown_state != SRV_SHUTDOWN_NONE) {
return;
}
/* make sure that there is enough reusable space in the redo
log files */
srv_main_thread_op_info = "checking free log space";
log_free_check();
/* Do an ibuf merge */
srv_main_thread_op_info = "doing insert buffer merge";
counter_time = ut_time_us(NULL);
ibuf_merge_in_background(false);
MONITOR_INC_TIME_IN_MICRO_SECS(
MONITOR_SRV_IBUF_MERGE_MICROSECOND, counter_time);
/* Flush logs if needed */
srv_main_thread_op_info = "flushing log";
srv_sync_log_buffer_in_background();
MONITOR_INC_TIME_IN_MICRO_SECS(
MONITOR_SRV_LOG_FLUSH_MICROSECOND, counter_time);
/* Now see if various tasks that are performed at defined
intervals need to be performed. */
#ifdef MEM_PERIODIC_CHECK
/* Check magic numbers of every allocated mem block once in
SRV_MASTER_MEM_VALIDATE_INTERVAL seconds */
if (cur_time % SRV_MASTER_MEM_VALIDATE_INTERVAL == 0) {
mem_validate_all_blocks();
MONITOR_INC_TIME_IN_MICRO_SECS(
MONITOR_SRV_MEM_VALIDATE_MICROSECOND, counter_time);
}
#endif
if (srv_shutdown_state != SRV_SHUTDOWN_NONE) {
return;
}
if (cur_time % SRV_MASTER_DICT_LRU_INTERVAL == 0) {
srv_main_thread_op_info = "enforcing dict cache limit";
n_evicted = srv_master_evict_from_table_cache(50);
MONITOR_INC_VALUE(
MONITOR_SRV_DICT_LRU_EVICT_COUNT_ACTIVE, n_evicted);
MONITOR_INC_TIME_IN_MICRO_SECS(
MONITOR_SRV_DICT_LRU_MICROSECOND, counter_time);
}
if (srv_shutdown_state != SRV_SHUTDOWN_NONE) {
return;
}
/* Make a new checkpoint */
if (cur_time % SRV_MASTER_CHECKPOINT_INTERVAL == 0) {
srv_main_thread_op_info = "making checkpoint";
log_checkpoint(TRUE, FALSE, TRUE);
MONITOR_INC_TIME_IN_MICRO_SECS(
MONITOR_SRV_CHECKPOINT_MICROSECOND, counter_time);
}
}
/*********************************************************************//**
Perform the tasks that the master thread is supposed to do whenever the
server is idle. We do check for the server state during this function
and if the server has entered the shutdown phase we may return from
the function without completing the required tasks.
Note that the server can move to active state when we are executing this
function but we don't check for that as we are suppose to perform more
or less same tasks when server is active. */
static
void
srv_master_do_idle_tasks(void)
/*==========================*/
{
ullint counter_time;
ulint n_evicted = 0;
++srv_main_idle_loops;
MONITOR_INC(MONITOR_MASTER_IDLE_LOOPS);
/* ALTER TABLE in MySQL requires on Unix that the table handler
can drop tables lazily after there no longer are SELECT
queries to them. */
counter_time = ut_time_us(NULL);
srv_main_thread_op_info = "doing background drop tables";
row_drop_tables_for_mysql_in_background();
MONITOR_INC_TIME_IN_MICRO_SECS(
MONITOR_SRV_BACKGROUND_DROP_TABLE_MICROSECOND,
counter_time);
if (srv_shutdown_state != SRV_SHUTDOWN_NONE) {
return;
}
/* make sure that there is enough reusable space in the redo
log files */
srv_main_thread_op_info = "checking free log space";
log_free_check();
/* Do an ibuf merge */
counter_time = ut_time_us(NULL);
srv_main_thread_op_info = "doing insert buffer merge";
ibuf_merge_in_background(true);
MONITOR_INC_TIME_IN_MICRO_SECS(
MONITOR_SRV_IBUF_MERGE_MICROSECOND, counter_time);
if (srv_shutdown_state != SRV_SHUTDOWN_NONE) {
return;
}
srv_main_thread_op_info = "enforcing dict cache limit";
n_evicted = srv_master_evict_from_table_cache(100);
MONITOR_INC_VALUE(
MONITOR_SRV_DICT_LRU_EVICT_COUNT_IDLE, n_evicted);
MONITOR_INC_TIME_IN_MICRO_SECS(
MONITOR_SRV_DICT_LRU_MICROSECOND, counter_time);
/* Flush logs if needed */
srv_sync_log_buffer_in_background();
MONITOR_INC_TIME_IN_MICRO_SECS(
MONITOR_SRV_LOG_FLUSH_MICROSECOND, counter_time);
if (srv_shutdown_state != SRV_SHUTDOWN_NONE) {
return;
}
/* Make a new checkpoint */
srv_main_thread_op_info = "making checkpoint";
log_checkpoint(TRUE, FALSE, TRUE);
MONITOR_INC_TIME_IN_MICRO_SECS(MONITOR_SRV_CHECKPOINT_MICROSECOND,
counter_time);
if (srv_shutdown_state > 0) {
return;
}
if (srv_log_arch_expire_sec) {
srv_main_thread_op_info = "purging archived logs";
purge_archived_logs(ut_time() - srv_log_arch_expire_sec,
0);
}
}
/** Perform shutdown tasks.
@param[in] ibuf_merge whether to complete the change buffer merge */
static
void
srv_shutdown(bool ibuf_merge)
{
ulint n_bytes_merged = 0;
ulint n_tables_to_drop;
ib_time_t now = ut_time();
do {
ut_ad(!srv_read_only_mode);
ut_ad(srv_shutdown_state == SRV_SHUTDOWN_CLEANUP);
++srv_main_shutdown_loops;
/* FIXME: Remove the background DROP TABLE queue; it is not
crash-safe and breaks ACID. */
srv_main_thread_op_info = "doing background drop tables";
n_tables_to_drop = row_drop_tables_for_mysql_in_background();
if (ibuf_merge) {
srv_main_thread_op_info = "checking free log space";
log_free_check();
srv_main_thread_op_info = "doing insert buffer merge";
n_bytes_merged = ibuf_merge_in_background(true);
/* Flush logs if needed */
srv_sync_log_buffer_in_background();
}
/* Print progress message every 60 seconds during shutdown */
if (srv_print_verbose_log) {
srv_shutdown_print_master_pending(
&now, n_tables_to_drop, n_bytes_merged);
}
} while (n_bytes_merged || n_tables_to_drop);
}
/*********************************************************************//**
Puts master thread to sleep. At this point we are using polling to
service various activities. Master thread sleeps for one second before
checking the state of the server again */
static
void
srv_master_sleep(void)
/*==================*/
{
srv_main_thread_op_info = "sleeping";
os_thread_sleep(1000000);
srv_main_thread_op_info = "";
}
/*********************************************************************//**
The master thread controlling the server.
@return a dummy parameter */
extern "C" UNIV_INTERN
os_thread_ret_t
DECLARE_THREAD(srv_master_thread)(
/*==============================*/
void* arg MY_ATTRIBUTE((unused)))
/*!< in: a dummy parameter required by
os_thread_create */
{
my_thread_init();
srv_slot_t* slot;
ulint old_activity_count = srv_get_activity_count();
ulint old_ibuf_merge_activity_count
= srv_get_ibuf_merge_activity_count();
ut_ad(!srv_read_only_mode);
srv_master_tid = os_thread_get_tid();
os_thread_set_priority(srv_master_tid, srv_sched_priority_master);
#ifdef UNIV_DEBUG_THREAD_CREATION
fprintf(stderr, "Master thread starts, id %lu\n",
os_thread_pf(os_thread_get_curr_id()));
#endif /* UNIV_DEBUG_THREAD_CREATION */
#ifdef UNIV_PFS_THREAD
pfs_register_thread(srv_master_thread_key);
#endif /* UNIV_PFS_THREAD */
srv_main_thread_process_no = os_proc_get_number();
srv_main_thread_id = os_thread_pf(os_thread_get_curr_id());
slot = srv_reserve_slot(SRV_MASTER);
ut_a(slot == srv_sys.sys_threads);
loop:
if (srv_force_recovery >= SRV_FORCE_NO_BACKGROUND) {
goto suspend_thread;
}
while (srv_shutdown_state == SRV_SHUTDOWN_NONE) {
srv_master_sleep();
MONITOR_INC(MONITOR_MASTER_THREAD_SLEEP);
srv_current_thread_priority = srv_master_thread_priority;
if (srv_check_activity(old_activity_count,
old_ibuf_merge_activity_count)) {
old_activity_count = srv_get_activity_count();
old_ibuf_merge_activity_count
= srv_get_ibuf_merge_activity_count();
srv_master_do_active_tasks();
} else {
srv_master_do_idle_tasks();
}
}
suspend_thread:
switch (srv_shutdown_state) {
case SRV_SHUTDOWN_NONE:
break;
case SRV_SHUTDOWN_FLUSH_PHASE:
case SRV_SHUTDOWN_LAST_PHASE:
ut_ad(0);
/* fall through */
case SRV_SHUTDOWN_EXIT_THREADS:
/* srv_init_abort() must have been invoked */
case SRV_SHUTDOWN_CLEANUP:
if (srv_shutdown_state == SRV_SHUTDOWN_CLEANUP
&& srv_fast_shutdown < 2) {
srv_shutdown(srv_fast_shutdown == 0);
}
srv_suspend_thread(slot);
my_thread_end();
os_thread_exit(NULL);
}
srv_main_thread_op_info = "suspending";
srv_suspend_thread(slot);
/* DO NOT CHANGE THIS STRING. innobase_start_or_create_for_mysql()
waits for database activity to die down when converting < 4.1.x
databases, and relies on this string being exactly as it is. InnoDB
manual also mentions this string in several places. */
srv_main_thread_op_info = "waiting for server activity";
srv_resume_thread(slot);
goto loop;
}
/** Check if purge should stop.
@param[in] n_purged pages purged in the last batch
@return whether purge should exit */
static
bool
srv_purge_should_exit(ulint n_purged)
{
ut_ad(srv_shutdown_state == SRV_SHUTDOWN_NONE
|| srv_shutdown_state == SRV_SHUTDOWN_CLEANUP);
if (srv_undo_sources) {
return(false);
}
if (srv_fast_shutdown) {
return(true);
}
/* Slow shutdown was requested. */
if (n_purged) {
#if defined HAVE_SYSTEMD && !defined EMBEDDED_LIBRARY
static ib_time_t progress_time;
ib_time_t time = ut_time();
if (time - progress_time >= 15) {
progress_time = time;
service_manager_extend_timeout(
INNODB_EXTEND_TIMEOUT_INTERVAL,
"InnoDB: to purge " ULINTPF " transactions",
trx_sys->rseg_history_len);
}
#endif
/* The previous round still did some work. */
return(false);
}
/* Exit if there are no active transactions to roll back. */
return(trx_sys_any_active_transactions() == 0);
}
/*********************************************************************//**
Fetch and execute a task from the work queue.
@return true if a task was executed */
static
bool
srv_task_execute(void)
/*==================*/
{
que_thr_t* thr = NULL;
ut_ad(!srv_read_only_mode);
ut_a(srv_force_recovery < SRV_FORCE_NO_BACKGROUND);
mutex_enter(&srv_sys.tasks_mutex);
if (UT_LIST_GET_LEN(srv_sys.tasks) > 0) {
thr = UT_LIST_GET_FIRST(srv_sys.tasks);
ut_a(que_node_get_type(thr->child) == QUE_NODE_PURGE);
UT_LIST_REMOVE(queue, srv_sys.tasks, thr);
}
mutex_exit(&srv_sys.tasks_mutex);
if (thr != NULL) {
que_run_threads(thr);
os_atomic_inc_ulint(
&purge_sys->bh_mutex, &purge_sys->n_completed, 1);
srv_inc_activity_count();
}
return(thr != NULL);
}
static ulint purge_tid_i = 0;
/*********************************************************************//**
Worker thread that reads tasks from the work queue and executes them.
@return a dummy parameter */
extern "C" UNIV_INTERN
os_thread_ret_t
DECLARE_THREAD(srv_worker_thread)(
/*==============================*/
void* arg MY_ATTRIBUTE((unused))) /*!< in: a dummy parameter
required by os_thread_create */
{
my_thread_init();
srv_slot_t* slot;
ulint tid_i = os_atomic_increment_ulint(&purge_tid_i, 1);
ut_ad(tid_i < srv_n_purge_threads);
ut_ad(!srv_read_only_mode);
ut_a(srv_force_recovery < SRV_FORCE_NO_BACKGROUND);
srv_purge_tids[tid_i] = os_thread_get_tid();
os_thread_set_priority(srv_purge_tids[tid_i],
srv_sched_priority_purge);
#ifdef UNIV_DEBUG_THREAD_CREATION
ut_print_timestamp(stderr);
fprintf(stderr, " InnoDB: worker thread starting, id %lu\n",
os_thread_pf(os_thread_get_curr_id()));
#endif /* UNIV_DEBUG_THREAD_CREATION */
slot = srv_reserve_slot(SRV_WORKER);
ut_a(srv_n_purge_threads > 1);
srv_sys_mutex_enter();
ut_a(srv_sys.n_threads_active[SRV_WORKER] < srv_n_purge_threads);
srv_sys_mutex_exit();
/* We need to ensure that the worker threads exit after the
purge coordinator thread. Otherwise the purge coordinaor can
end up waiting forever in trx_purge_wait_for_workers_to_complete() */
do {
srv_suspend_thread(slot);
srv_resume_thread(slot);
srv_current_thread_priority = srv_purge_thread_priority;
if (srv_task_execute()) {
/* If there are tasks in the queue, wakeup
the purge coordinator thread. */
srv_wake_purge_thread_if_not_active();
}
/* Note: we are checking the state without holding the
purge_sys->latch here. */
} while (purge_sys->state != PURGE_STATE_EXIT);
srv_free_slot(slot);
rw_lock_x_lock(&purge_sys->latch);
ut_a(!purge_sys->running);
ut_a(purge_sys->state == PURGE_STATE_EXIT);
ut_a(srv_shutdown_state > SRV_SHUTDOWN_NONE);
rw_lock_x_unlock(&purge_sys->latch);
#ifdef UNIV_DEBUG_THREAD_CREATION
ut_print_timestamp(stderr);
fprintf(stderr, " InnoDB: Purge worker thread exiting, id %lu\n",
os_thread_pf(os_thread_get_curr_id()));
#endif /* UNIV_DEBUG_THREAD_CREATION */
my_thread_end();
/* We count the number of threads in os_thread_exit(). A created
thread should always use that to exit and not use return() to exit. */
os_thread_exit(NULL);
OS_THREAD_DUMMY_RETURN; /* Not reached, avoid compiler warning */
}
/*********************************************************************//**
Do the actual purge operation.
@return length of history list before the last purge batch. */
static
ulint
srv_do_purge(
/*=========*/
ulint n_threads, /*!< in: number of threads to use */
ulint* n_total_purged) /*!< in/out: total pages purged */
{
ulint n_pages_purged;
static ulint count = 0;
static ulint n_use_threads = 0;
static ulint rseg_history_len = 0;
ulint old_activity_count = srv_get_activity_count();
ut_a(n_threads > 0);
ut_ad(!srv_read_only_mode);
/* Purge until there are no more records to purge and there is
no change in configuration or server state. If the user has
configured more than one purge thread then we treat that as a
pool of threads and only use the extra threads if purge can't
keep up with updates. */
if (n_use_threads == 0) {
n_use_threads = n_threads;
}
do {
srv_current_thread_priority = srv_purge_thread_priority;
if (trx_sys->rseg_history_len > rseg_history_len
|| (srv_max_purge_lag > 0
&& rseg_history_len > srv_max_purge_lag)) {
/* History length is now longer than what it was
when we took the last snapshot. Use more threads. */
if (n_use_threads < n_threads) {
++n_use_threads;
}
} else if (srv_check_activity(old_activity_count)
&& n_use_threads > 1) {
/* History length same or smaller since last snapshot,
use fewer threads. */
--n_use_threads;
old_activity_count = srv_get_activity_count();
}
/* Ensure that the purge threads are less than what
was configured. */
ut_a(n_use_threads > 0);
ut_a(n_use_threads <= n_threads);
/* Take a snapshot of the history list before purge. */
if ((rseg_history_len = trx_sys->rseg_history_len) == 0) {
break;
}
n_pages_purged = trx_purge(
n_use_threads, srv_purge_batch_size,
(++count % TRX_SYS_N_RSEGS) == 0);
*n_total_purged += n_pages_purged;
} while (!srv_purge_should_exit(n_pages_purged)
&& n_pages_purged > 0
&& purge_sys->state == PURGE_STATE_RUN);
return(rseg_history_len);
}
/*********************************************************************//**
Suspend the purge coordinator thread. */
static
void
srv_purge_coordinator_suspend(
/*==========================*/
srv_slot_t* slot, /*!< in/out: Purge coordinator
thread slot */
ulint rseg_history_len) /*!< in: history list length
before last purge */
{
ut_ad(!srv_read_only_mode);
ut_a(slot->type == SRV_PURGE);
bool stop = false;
/** Maximum wait time on the purge event, in micro-seconds. */
static const ulint SRV_PURGE_MAX_TIMEOUT = 10000;
ib_int64_t sig_count = srv_suspend_thread(slot);
do {
rw_lock_x_lock(&purge_sys->latch);
purge_sys->running = false;
rw_lock_x_unlock(&purge_sys->latch);
/* We don't wait right away on the the non-timed wait because
we want to signal the thread that wants to suspend purge. */
const bool wait = stop
|| rseg_history_len <= trx_sys->rseg_history_len;
const bool timeout = srv_resume_thread(
slot, sig_count, wait,
stop ? 0 : SRV_PURGE_MAX_TIMEOUT);
sig_count = srv_suspend_thread(slot);
rw_lock_x_lock(&purge_sys->latch);
stop = (srv_shutdown_state == SRV_SHUTDOWN_NONE
&& purge_sys->state == PURGE_STATE_STOP);
if (!stop) {
ut_a(purge_sys->n_stop == 0);
purge_sys->running = true;
if (timeout
&& rseg_history_len == trx_sys->rseg_history_len
&& trx_sys->rseg_history_len < 5000) {
/* No new records were added since the
wait started. Simply wait for new
records. The magic number 5000 is an
approximation for the case where we
have cached UNDO log records which
prevent truncate of the UNDO
segments. */
stop = true;
}
} else {
ut_a(purge_sys->n_stop > 0);
/* Signal that we are suspended. */
os_event_set(purge_sys->event);
}
rw_lock_x_unlock(&purge_sys->latch);
} while (stop && srv_undo_sources);
srv_resume_thread(slot, 0, false);
}
/*********************************************************************//**
Purge coordinator thread that schedules the purge tasks.
@return a dummy parameter */
extern "C" UNIV_INTERN
os_thread_ret_t
DECLARE_THREAD(srv_purge_coordinator_thread)(
/*=========================================*/
void* arg MY_ATTRIBUTE((unused))) /*!< in: a dummy parameter
required by os_thread_create */
{
my_thread_init();
srv_slot_t* slot;
ulint n_total_purged = ULINT_UNDEFINED;
ut_ad(!srv_read_only_mode);
ut_a(srv_n_purge_threads >= 1);
ut_a(trx_purge_state() == PURGE_STATE_INIT);
ut_a(srv_force_recovery < SRV_FORCE_NO_BACKGROUND);
srv_purge_tids[0] = os_thread_get_tid();
os_thread_set_priority(srv_purge_tids[0], srv_sched_priority_purge);
rw_lock_x_lock(&purge_sys->latch);
purge_sys->running = true;
purge_sys->state = PURGE_STATE_RUN;
rw_lock_x_unlock(&purge_sys->latch);
#ifdef UNIV_PFS_THREAD
pfs_register_thread(srv_purge_thread_key);
#endif /* UNIV_PFS_THREAD */
#ifdef UNIV_DEBUG_THREAD_CREATION
ut_print_timestamp(stderr);
fprintf(stderr, " InnoDB: Purge coordinator thread created, id %lu\n",
os_thread_pf(os_thread_get_curr_id()));
#endif /* UNIV_DEBUG_THREAD_CREATION */
slot = srv_reserve_slot(SRV_PURGE);
ulint rseg_history_len = trx_sys->rseg_history_len;
do {
/* If there are no records to purge or the last
purge didn't purge any records then wait for activity. */
if (srv_shutdown_state == SRV_SHUTDOWN_NONE
&& srv_undo_sources
&& (purge_sys->state == PURGE_STATE_STOP
|| n_total_purged == 0)) {
srv_purge_coordinator_suspend(slot, rseg_history_len);
}
ut_ad(!slot->suspended);
if (srv_purge_should_exit(n_total_purged)) {
break;
}
n_total_purged = 0;
srv_current_thread_priority = srv_purge_thread_priority;
rseg_history_len = srv_do_purge(
srv_n_purge_threads, &n_total_purged);
srv_inc_activity_count();
} while (!srv_purge_should_exit(n_total_purged));
/* The task queue should always be empty, independent of fast
shutdown state. */
ut_a(srv_get_task_queue_length() == 0);
srv_free_slot(slot);
/* Note that we are shutting down. */
rw_lock_x_lock(&purge_sys->latch);
purge_sys->state = PURGE_STATE_EXIT;
purge_sys->running = false;
rw_lock_x_unlock(&purge_sys->latch);
#ifdef UNIV_DEBUG_THREAD_CREATION
ut_print_timestamp(stderr);
fprintf(stderr, " InnoDB: Purge coordinator exiting, id %lu\n",
os_thread_pf(os_thread_get_curr_id()));
#endif /* UNIV_DEBUG_THREAD_CREATION */
/* Ensure that all the worker threads quit. */
if (srv_n_purge_threads > 1) {
srv_release_threads(SRV_WORKER, srv_n_purge_threads - 1);
}
my_thread_end();
/* We count the number of threads in os_thread_exit(). A created
thread should always use that to exit and not use return() to exit. */
os_thread_exit(NULL);
OS_THREAD_DUMMY_RETURN; /* Not reached, avoid compiler warning */
}
/**********************************************************************//**
Enqueues a task to server task queue and releases a worker thread, if there
is a suspended one. */
UNIV_INTERN
void
srv_que_task_enqueue_low(
/*=====================*/
que_thr_t* thr) /*!< in: query thread */
{
ut_ad(!srv_read_only_mode);
mutex_enter(&srv_sys.tasks_mutex);
UT_LIST_ADD_LAST(queue, srv_sys.tasks, thr);
mutex_exit(&srv_sys.tasks_mutex);
srv_release_threads(SRV_WORKER, 1);
}
/**********************************************************************//**
Get count of tasks in the queue.
@return number of tasks in queue */
UNIV_INTERN
ulint
srv_get_task_queue_length(void)
/*===========================*/
{
ulint n_tasks;
ut_ad(!srv_read_only_mode);
mutex_enter(&srv_sys.tasks_mutex);
n_tasks = UT_LIST_GET_LEN(srv_sys.tasks);
mutex_exit(&srv_sys.tasks_mutex);
return(n_tasks);
}
/** Wake up the purge threads. */
UNIV_INTERN
void
srv_purge_wakeup()
{
ut_ad(!srv_read_only_mode);
if (srv_force_recovery < SRV_FORCE_NO_BACKGROUND) {
srv_release_threads(SRV_PURGE, 1);
if (srv_n_purge_threads > 1) {
ulint n_workers = srv_n_purge_threads - 1;
srv_release_threads(SRV_WORKER, n_workers);
}
}
}
/** Check whether given space id is undo tablespace id
@param[in] space_id space id to check
@return true if it is undo tablespace else false. */
bool
srv_is_undo_tablespace(
ulint space_id)
{
if (srv_undo_space_id_start == 0) {
return (false);
}
return(space_id >= srv_undo_space_id_start
&& space_id < (srv_undo_space_id_start
+ srv_undo_tablespaces_open));
}
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