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66d624b7d6
Problem: Uninstallation of semi sync plugin causes replication to
break.
Analysis: A semisync enabled replication is mutual agreement between
Master and Slave when the connection (I/O thread) is established.
Once I/O thread is started and if semisync is enabled on both
master and slave, master appends special magic header to events
using semisync plugin functions and sends it to slave. And slave
expects that each event will have that special magic header format
and reads those bytes using semisync plugin functions.
When semi sync replication is in use if users execute
uninstallation of the plugin on master, slave gets confused while
interpreting that event's content because it expects special
magic header at the beginning of the event. Slave SQL thread will
be stopped with "Missing magic number in the header" error.
Similar problem will happen if uninstallation of the plugin happens
on slave when semi sync replication is in in use. Master sends
the events with magic header and slave does not know about the
added magic header and thinks that it received a corrupted event.
Hence slave SQL thread stops with "Found corrupted event" error.
Fix: Uninstallation of semisync plugin will be blocked when semisync
replication is in use and will throw 'ER_UNKNOWN_ERROR' error.
To detect that semisync replication is in use, this patch uses
semisync status variable values.
> On Master, it checks for 'Rpl_semi_sync_master_status' to be OFF
before allowing the uninstallation of rpl_semi_sync_master plugin.
>> Rpl_semi_sync_master_status is OFF when
>>> there is no dump thread running
>>> there are no semisync slaves
> On Slave, it checks for 'Rpl_semi_sync_slave_status' to be OFF
before allowing the uninstallation of rpl_semi_sync_slave plugin.
>> Rpl_semi_sync_slave_status is OFF when
>>> there is no I/O thread running
>>> replication is asynchronous replication.
137 lines
5.6 KiB
C++
137 lines
5.6 KiB
C++
/* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifndef SQL_SHOW_H
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#define SQL_SHOW_H
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#include "sql_list.h" /* List */
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#include "handler.h" /* enum_schema_tables */
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#include "table.h" /* enum_schema_table_state */
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/* Forward declarations */
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class JOIN;
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class String;
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class THD;
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class sp_name;
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struct TABLE_LIST;
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struct st_ha_create_information;
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typedef class st_select_lex SELECT_LEX;
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typedef st_ha_create_information HA_CREATE_INFO;
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struct LEX;
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typedef struct st_mysql_show_var SHOW_VAR;
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typedef struct st_schema_table ST_SCHEMA_TABLE;
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struct TABLE;
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typedef struct system_status_var STATUS_VAR;
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enum find_files_result {
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FIND_FILES_OK,
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FIND_FILES_OOM,
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FIND_FILES_DIR
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};
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/* Used by handlers to store things in schema tables */
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#define IS_FILES_FILE_ID 0
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#define IS_FILES_FILE_NAME 1
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#define IS_FILES_FILE_TYPE 2
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#define IS_FILES_TABLESPACE_NAME 3
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#define IS_FILES_TABLE_CATALOG 4
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#define IS_FILES_TABLE_SCHEMA 5
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#define IS_FILES_TABLE_NAME 6
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#define IS_FILES_LOGFILE_GROUP_NAME 7
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#define IS_FILES_LOGFILE_GROUP_NUMBER 8
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#define IS_FILES_ENGINE 9
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#define IS_FILES_FULLTEXT_KEYS 10
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#define IS_FILES_DELETED_ROWS 11
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#define IS_FILES_UPDATE_COUNT 12
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#define IS_FILES_FREE_EXTENTS 13
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#define IS_FILES_TOTAL_EXTENTS 14
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#define IS_FILES_EXTENT_SIZE 15
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#define IS_FILES_INITIAL_SIZE 16
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#define IS_FILES_MAXIMUM_SIZE 17
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#define IS_FILES_AUTOEXTEND_SIZE 18
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#define IS_FILES_CREATION_TIME 19
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#define IS_FILES_LAST_UPDATE_TIME 20
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#define IS_FILES_LAST_ACCESS_TIME 21
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#define IS_FILES_RECOVER_TIME 22
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#define IS_FILES_TRANSACTION_COUNTER 23
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#define IS_FILES_VERSION 24
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#define IS_FILES_ROW_FORMAT 25
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#define IS_FILES_TABLE_ROWS 26
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#define IS_FILES_AVG_ROW_LENGTH 27
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#define IS_FILES_DATA_LENGTH 28
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#define IS_FILES_MAX_DATA_LENGTH 29
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#define IS_FILES_INDEX_LENGTH 30
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#define IS_FILES_DATA_FREE 31
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#define IS_FILES_CREATE_TIME 32
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#define IS_FILES_UPDATE_TIME 33
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#define IS_FILES_CHECK_TIME 34
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#define IS_FILES_CHECKSUM 35
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#define IS_FILES_STATUS 36
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#define IS_FILES_EXTRA 37
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find_files_result find_files(THD *thd, List<LEX_STRING> *files, const char *db,
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const char *path, const char *wild, bool dir);
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int store_create_info(THD *thd, TABLE_LIST *table_list, String *packet,
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HA_CREATE_INFO *create_info_arg, bool show_database);
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int view_store_create_info(THD *thd, TABLE_LIST *table, String *buff);
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int copy_event_to_schema_table(THD *thd, TABLE *sch_table, TABLE *event_table);
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int get_quote_char_for_identifier(THD *thd, const char *name, uint length);
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void append_identifier(THD *thd, String *packet, const char *name,
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uint length);
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void mysqld_list_fields(THD *thd,TABLE_LIST *table, const char *wild);
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int mysqld_dump_create_info(THD *thd, TABLE_LIST *table_list, int fd);
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bool mysqld_show_create(THD *thd, TABLE_LIST *table_list);
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bool mysqld_show_create_db(THD *thd, char *dbname, HA_CREATE_INFO *create);
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void mysqld_list_processes(THD *thd,const char *user,bool verbose);
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int mysqld_show_status(THD *thd);
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int mysqld_show_variables(THD *thd,const char *wild);
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bool mysqld_show_storage_engines(THD *thd);
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bool mysqld_show_authors(THD *thd);
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bool mysqld_show_contributors(THD *thd);
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bool mysqld_show_privileges(THD *thd);
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char *make_backup_log_name(char *buff, const char *name, const char* log_ext);
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void calc_sum_of_all_status(STATUS_VAR *to);
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void append_definer(THD *thd, String *buffer, const LEX_STRING *definer_user,
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const LEX_STRING *definer_host);
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int add_status_vars(SHOW_VAR *list);
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void remove_status_vars(SHOW_VAR *list);
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void init_status_vars();
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void free_status_vars();
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bool get_status_var(THD* thd, SHOW_VAR *list, const char *name, char * const buff);
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void reset_status_vars();
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bool show_create_trigger(THD *thd, const sp_name *trg_name);
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void view_store_options(THD *thd, TABLE_LIST *table, String *buff);
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void init_fill_schema_files_row(TABLE* table);
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bool schema_table_store_record(THD *thd, TABLE *table);
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void initialize_information_schema_acl();
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ST_SCHEMA_TABLE *find_schema_table(THD *thd, const char* table_name);
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ST_SCHEMA_TABLE *get_schema_table(enum enum_schema_tables schema_table_idx);
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int make_schema_select(THD *thd, SELECT_LEX *sel,
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enum enum_schema_tables schema_table_idx);
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int mysql_schema_table(THD *thd, LEX *lex, TABLE_LIST *table_list);
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bool get_schema_tables_result(JOIN *join,
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enum enum_schema_table_state executed_place);
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enum enum_schema_tables get_schema_table_idx(ST_SCHEMA_TABLE *schema_table);
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/* These functions were under INNODB_COMPATIBILITY_HOOKS */
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int get_quote_char_for_identifier(THD *thd, const char *name, uint length);
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#endif /* SQL_SHOW_H */
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