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A pre-requisite patch for the fix for Bug#52044.

Browse Source 
This patch also fixes Bug#55452 "SET PASSWORD is
replicated twice in RBR mode".

The goal of this patch is to remove the release of 
metadata locks from close_thread_tables().
This is necessary to not mistakenly release
the locks in the course of a multi-step
operation that involves multiple close_thread_tables()
or close_tables_for_reopen().

On the same token, move statement commit outside 
close_thread_tables().

Other cleanups:
Cleanup COM_FIELD_LIST.
Don't call close_thread_tables() in COM_SHUTDOWN -- there
are no open tables there that can be closed (we leave
the locked tables mode in THD destructor, and this
close_thread_tables() won't leave it anyway).

Make open_and_lock_tables() and open_and_lock_tables_derived()
call close_thread_tables() upon failure.
Remove the calls to close_thread_tables() that are now
unnecessary.

Simplify the back off condition in Open_table_context.

Streamline metadata lock handling in LOCK TABLES 
implementation.

Add asserts to ensure correct life cycle of 
statement transaction in a session.

Remove a piece of dead code that has also become redundant
after the fix for Bug 37521.
This commit is contained in:
Konstantin Osipov
2010-07-27 14:25:53 +04:00
parent c67cf159e9
commit ec2c3bf2c1
42 changed files with 590 additions and 468 deletions
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14
sql/events.cc
View File

@@ -16,7 +16,7 @@
#include "sql_priv.h"
#include "unireg.h"
#include "sql_parse.h" // check_access
#include "sql_base.h" // close_thread_tables
#include "sql_base.h" // close_mysql_tables
#include "sql_show.h" // append_definer
#include "events.h"
#include "sql_db.h" // check_db_dir_existence
@@ -754,7 +754,6 @@ Events::fill_schema_events(THD *thd, TABLE_LIST *tables, COND * /* cond */)
{
char *db= NULL;
int ret;
Open_tables_backup open_tables_backup;
DBUG_ENTER("Events::fill_schema_events");
if (check_if_system_tables_error())
@@ -773,15 +772,7 @@ Events::fill_schema_events(THD *thd, TABLE_LIST *tables, COND * /* cond */)
DBUG_RETURN(1);
db= thd->lex->select_lex.db;
}
/*
Reset and backup of the currently open tables in this thread
is a way to allow SELECTs from INFORMATION_SCHEMA.events under
LOCK TABLES and in pre-locked mode. See also
Events::show_create_event for additional comments.
*/
thd->reset_n_backup_open_tables_state(&open_tables_backup);
ret= db_repository->fill_schema_events(thd, tables, db);
thd->restore_backup_open_tables_state(&open_tables_backup);
DBUG_RETURN(ret);
}
@@ -1161,8 +1152,7 @@ Events::load_events_from_db(THD *thd)
end:
end_read_record(&read_record_info);
close_thread_tables(thd);
close_mysql_tables(thd);
DBUG_RETURN(ret);
}