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72a2de92a1
buf_flush_page_cleaner_coordinator: In the first loop, use an appropriate termination condition, waiting for !recv_writer_thread_active. logs_empty_and_mark_files_at_shutdown(): Signal recv_sys->flush_start in case the recv_writer_thread was never started, or buf_flush_page_cleaner_coordinator failed to notice its termination. innobase_start_or_create_for_mysql(): Remove a redundant, unreachable condition, and properly release resources when aborting startup due to recv_sys->found_corrupt_log.
317 lines
10 KiB
C++
317 lines
10 KiB
C++
/*****************************************************************************
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Copyright (c) 1997, 2016, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2017, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/log0recv.h
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Recovery
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Created 9/20/1997 Heikki Tuuri
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*******************************************************/
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#ifndef log0recv_h
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#define log0recv_h
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#include "univ.i"
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#include "ut0byte.h"
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#include "buf0types.h"
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#include "hash0hash.h"
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#include "log0log.h"
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#include "mtr0types.h"
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#include "ut0new.h"
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#include <list>
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#include <vector>
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/** Is recv_writer_thread active? */
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extern bool recv_writer_thread_active;
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/** @return whether recovery is currently running. */
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#define recv_recovery_is_on() recv_recovery_on
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/** Find the latest checkpoint in the log header.
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@param[out] max_field LOG_CHECKPOINT_1 or LOG_CHECKPOINT_2
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@return error code or DB_SUCCESS */
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dberr_t
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recv_find_max_checkpoint(ulint* max_field)
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MY_ATTRIBUTE((nonnull, warn_unused_result));
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/** Apply the hashed log records to the page, if the page lsn is less than the
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lsn of a log record.
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@param just_read_in whether the page recently arrived to the I/O handler
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@param block the page in the buffer pool */
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void
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recv_recover_page(bool just_read_in, buf_block_t* block);
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/** Start recovering from a redo log checkpoint.
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@see recv_recovery_from_checkpoint_finish
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@param[in] flush_lsn FIL_PAGE_FILE_FLUSH_LSN
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of first system tablespace page
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@return error code or DB_SUCCESS */
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dberr_t
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recv_recovery_from_checkpoint_start(
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lsn_t flush_lsn);
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/** Complete recovery from a checkpoint. */
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void
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recv_recovery_from_checkpoint_finish(void);
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/********************************************************//**
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Initiates the rollback of active transactions. */
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void
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recv_recovery_rollback_active(void);
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/*===============================*/
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/******************************************************//**
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Resets the logs. The contents of log files will be lost! */
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void
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recv_reset_logs(
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/*============*/
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lsn_t lsn); /*!< in: reset to this lsn
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rounded up to be divisible by
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OS_FILE_LOG_BLOCK_SIZE, after
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which we add
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LOG_BLOCK_HDR_SIZE */
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/** Clean up after recv_sys_init() */
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void
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recv_sys_close();
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/** Initialize the redo log recovery subsystem. */
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void
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recv_sys_init();
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/********************************************************//**
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Frees the recovery system. */
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void
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recv_sys_debug_free(void);
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/*=====================*/
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/** Read a log segment to a buffer.
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@param[out] buf buffer
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@param[in] group redo log files
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@param[in] start_lsn read area start
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@param[in] end_lsn read area end
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@return valid end_lsn */
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lsn_t
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log_group_read_log_seg(
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byte* buf,
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const log_group_t* group,
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lsn_t start_lsn,
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lsn_t end_lsn);
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/********************************************************//**
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Reset the state of the recovery system variables. */
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void
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recv_sys_var_init(void);
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/*===================*/
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/** Apply the hash table of stored log records to persistent data pages.
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@param[in] last_batch whether the change buffer merge will be
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performed as part of the operation */
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void
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recv_apply_hashed_log_recs(bool last_batch);
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/** Block of log record data */
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struct recv_data_t{
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recv_data_t* next; /*!< pointer to the next block or NULL */
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/*!< the log record data is stored physically
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immediately after this struct, max amount
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RECV_DATA_BLOCK_SIZE bytes of it */
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};
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/** Stored log record struct */
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struct recv_t{
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mlog_id_t type; /*!< log record type */
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ulint len; /*!< log record body length in bytes */
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recv_data_t* data; /*!< chain of blocks containing the log record
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body */
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lsn_t start_lsn;/*!< start lsn of the log segment written by
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the mtr which generated this log record: NOTE
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that this is not necessarily the start lsn of
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this log record */
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lsn_t end_lsn;/*!< end lsn of the log segment written by
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the mtr which generated this log record: NOTE
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that this is not necessarily the end lsn of
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this log record */
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UT_LIST_NODE_T(recv_t)
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rec_list;/*!< list of log records for this page */
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};
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/** States of recv_addr_t */
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enum recv_addr_state {
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/** not yet processed */
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RECV_NOT_PROCESSED,
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/** page is being read */
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RECV_BEING_READ,
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/** log records are being applied on the page */
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RECV_BEING_PROCESSED,
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/** log records have been applied on the page */
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RECV_PROCESSED,
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/** log records have been discarded because the tablespace
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does not exist */
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RECV_DISCARDED
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};
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/** Hashed page file address struct */
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struct recv_addr_t{
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enum recv_addr_state state;
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/*!< recovery state of the page */
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unsigned space:32;/*!< space id */
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unsigned page_no:32;/*!< page number */
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UT_LIST_BASE_NODE_T(recv_t)
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rec_list;/*!< list of log records for this page */
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hash_node_t addr_hash;/*!< hash node in the hash bucket chain */
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};
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struct recv_dblwr_t {
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/** Add a page frame to the doublewrite recovery buffer. */
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void add(byte* page) {
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pages.push_back(page);
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}
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/** Find a doublewrite copy of a page.
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@param[in] space_id tablespace identifier
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@param[in] page_no page number
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@return page frame
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@retval NULL if no page was found */
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const byte* find_page(ulint space_id, ulint page_no);
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typedef std::list<byte*, ut_allocator<byte*> > list;
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/** Recovered doublewrite buffer page frames */
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list pages;
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};
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/** Recovery system data structure */
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struct recv_sys_t{
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ib_mutex_t mutex; /*!< mutex protecting the fields apply_log_recs,
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n_addrs, and the state field in each recv_addr
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struct */
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ib_mutex_t writer_mutex;/*!< mutex coordinating
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flushing between recv_writer_thread and
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the recovery thread. */
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os_event_t flush_start;/*!< event to acticate
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page cleaner threads */
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os_event_t flush_end;/*!< event to signal that the page
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cleaner has finished the request */
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buf_flush_t flush_type;/*!< type of the flush request.
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BUF_FLUSH_LRU: flush end of LRU, keeping free blocks.
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BUF_FLUSH_LIST: flush all of blocks. */
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ibool apply_log_recs;
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/*!< this is TRUE when log rec application to
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pages is allowed; this flag tells the
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i/o-handler if it should do log record
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application */
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ibool apply_batch_on;
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/*!< this is TRUE when a log rec application
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batch is running */
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byte* buf; /*!< buffer for parsing log records */
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ulint len; /*!< amount of data in buf */
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lsn_t parse_start_lsn;
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/*!< this is the lsn from which we were able to
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start parsing log records and adding them to
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the hash table; zero if a suitable
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start point not found yet */
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lsn_t scanned_lsn;
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/*!< the log data has been scanned up to this
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lsn */
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ulint scanned_checkpoint_no;
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/*!< the log data has been scanned up to this
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checkpoint number (lowest 4 bytes) */
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ulint recovered_offset;
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/*!< start offset of non-parsed log records in
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buf */
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lsn_t recovered_lsn;
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/*!< the log records have been parsed up to
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this lsn */
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bool found_corrupt_log;
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/*!< set when finding a corrupt log
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block or record, or there is a log
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parsing buffer overflow */
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bool found_corrupt_fs;
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/*!< set when an inconsistency with
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the file system contents is detected
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during log scan or apply */
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lsn_t mlog_checkpoint_lsn;
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/*!< the LSN of a MLOG_CHECKPOINT
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record, or 0 if none was parsed */
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/** the time when progress was last reported */
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ib_time_t progress_time;
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mem_heap_t* heap; /*!< memory heap of log records and file
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addresses*/
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hash_table_t* addr_hash;/*!< hash table of file addresses of pages */
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ulint n_addrs;/*!< number of not processed hashed file
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addresses in the hash table */
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recv_dblwr_t dblwr;
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/** Determine whether redo log recovery progress should be reported.
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@param[in] time the current time
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@return whether progress should be reported
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(the last report was at least 15 seconds ago) */
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bool report(ib_time_t time)
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{
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if (time - progress_time < 15) {
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return false;
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}
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progress_time = time;
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return true;
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}
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};
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/** The recovery system */
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extern recv_sys_t* recv_sys;
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/** TRUE when applying redo log records during crash recovery; FALSE
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otherwise. Note that this is FALSE while a background thread is
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rolling back incomplete transactions. */
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extern volatile bool recv_recovery_on;
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/** If the following is TRUE, the buffer pool file pages must be invalidated
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after recovery and no ibuf operations are allowed; this becomes TRUE if
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the log record hash table becomes too full, and log records must be merged
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to file pages already before the recovery is finished: in this case no
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ibuf operations are allowed, as they could modify the pages read in the
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buffer pool before the pages have been recovered to the up-to-date state.
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TRUE means that recovery is running and no operations on the log files
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are allowed yet: the variable name is misleading. */
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extern bool recv_no_ibuf_operations;
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/** TRUE when recv_init_crash_recovery() has been called. */
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extern bool recv_needed_recovery;
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#ifdef UNIV_DEBUG
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/** TRUE if writing to the redo log (mtr_commit) is forbidden.
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Protected by log_sys->mutex. */
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extern bool recv_no_log_write;
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#endif /* UNIV_DEBUG */
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/** TRUE if buf_page_is_corrupted() should check if the log sequence
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number (FIL_PAGE_LSN) is in the future. Initially FALSE, and set by
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recv_recovery_from_checkpoint_start(). */
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extern bool recv_lsn_checks_on;
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/** Size of the parsing buffer; it must accommodate RECV_SCAN_SIZE many
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times! */
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#define RECV_PARSING_BUF_SIZE (2 * 1024 * 1024)
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/** Size of block reads when the log groups are scanned forward to do a
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roll-forward */
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#define RECV_SCAN_SIZE (4 * UNIV_PAGE_SIZE)
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/** This many frames must be left free in the buffer pool when we scan
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the log and store the scanned log records in the buffer pool: we will
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use these free frames to read in pages when we start applying the
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log records to the database. */
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extern ulint recv_n_pool_free_frames;
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#endif
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