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Code Activity

MDEV-20715 : Implement system variable to disallow local GTIDs in Galera

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Added a new wsrep_mode feature DISALLOW_LOCAL_GTID for this.
Nodes can have GTIDs for local transactions in the following scenarios:

A DDL statement is executed with wsrep_OSU_method=RSU set.
A DML statement writes to a non-InnoDB table.
A DML statement writes to an InnoDB table with wsrep_on=OFF set.

If user has set wsrep_mode=DISALLOW_LOCAL_GTID these operations
produce a error ERROR HY000: Galera replication not supported
This commit is contained in:
Jan Lindström
2021-03-01 15:21:31 +02:00
parent b47304eb02
commit ebb2db5912
12 changed files with 429 additions and 11 deletions
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36
sql/sql_base.cc
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@ -4445,7 +4445,41 @@ restart:
error= TRUE;
goto error;
}
#endif
/* If user has issued wsrep_on = OFF and wsrep was on before
we need to check is local gtid feature disabled */
if (thd->wsrep_was_on &&
thd->variables.sql_log_bin == 1 &&
!WSREP(thd) &&
wsrep_check_mode(WSREP_MODE_DISALLOW_LOCAL_GTID))
{
enum_sql_command sql_command= thd->lex->sql_command;
bool is_dml_stmt= thd->get_command() != COM_STMT_PREPARE &&
(sql_command == SQLCOM_INSERT ||
sql_command == SQLCOM_INSERT_SELECT ||
sql_command == SQLCOM_REPLACE ||
sql_command == SQLCOM_REPLACE_SELECT ||
sql_command == SQLCOM_UPDATE ||
sql_command == SQLCOM_UPDATE_MULTI ||
sql_command == SQLCOM_LOAD ||
sql_command == SQLCOM_DELETE);
if (is_dml_stmt && !is_temporary_table(tables))
{
/* wsrep_mode = WSREP_MODE_DISALLOW_LOCAL_GTID, treat as error */
my_error(ER_GALERA_REPLICATION_NOT_SUPPORTED, MYF(0));
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
ER_OPTION_PREVENTS_STATEMENT,
"You can't execute statements that would generate local "
"GTIDs when wsrep_mode = DISALLOW_LOCAL_GTID is set. "
"Try disabling binary logging with SET sql_log_bin=0 "
"to execute this statement.");
error= TRUE;
goto error;
}
}
#endif /* WITH_WSREP */
}
error: