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Code Activity

Honor lock_wait_timeout when updating stats tables

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- Call delete_statistics_tables() after lock_table_names in drop tables.
  This avoids a deadlock issue with FTWRL and future backup locks.
- Added some missing clear_error()
- Ensure we don't clear error caused by the caller
- Updated function comments
This commit is contained in:
Monty
2018-11-27 16:59:29 +02:00
parent e54643a063
commit f386b70beb
3 changed files with 51 additions and 34 deletions
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11
sql/sql_base.cc
View File

@ -8885,7 +8885,6 @@ open_system_tables_for_read(THD *thd, TABLE_LIST *table_list,
{
Query_tables_list query_tables_list_backup;
LEX *lex= thd->lex;
DBUG_ENTER("open_system_tables_for_read");
/*
@ -8899,9 +8898,15 @@ open_system_tables_for_read(THD *thd, TABLE_LIST *table_list,
thd->reset_n_backup_open_tables_state(backup);
thd->lex->sql_command= SQLCOM_SELECT;
/*
Only use MYSQL_LOCK_IGNORE_TIMEOUT for tables opened for read.
This is to ensure that lock_wait_timeout is honored when trying
to update stats tables.
*/
if (open_and_lock_tables(thd, table_list, FALSE,
MYSQL_OPEN_IGNORE_FLUSH |
MYSQL_LOCK_IGNORE_TIMEOUT))
(MYSQL_OPEN_IGNORE_FLUSH |
(table_list->lock_type < TL_WRITE_ALLOW_WRITE ?
MYSQL_LOCK_IGNORE_TIMEOUT : 0))))
{
lex->restore_backup_query_tables_list(&query_tables_list_backup);
thd->restore_backup_open_tables_state(backup);

49
sql/sql_statistics.cc
View File

@ -3253,7 +3253,7 @@ int read_statistics_for_tables_if_needed(THD *thd, TABLE_LIST *tables)
{
TABLE_LIST stat_tables[STATISTICS_TABLES];
Open_tables_backup open_tables_backup;
bool has_error_active= thd->is_error();
DBUG_ENTER("read_statistics_for_tables_if_needed");
DEBUG_SYNC(thd, "statistics_read_start");
@ -3263,7 +3263,8 @@ int read_statistics_for_tables_if_needed(THD *thd, TABLE_LIST *tables)
if (open_stat_tables(thd, stat_tables, &open_tables_backup, FALSE))
{
thd->clear_error();
if (!has_error_active)
thd->clear_error();
DBUG_RETURN(1);
}
@ -3317,7 +3318,7 @@ int read_statistics_for_tables_if_needed(THD *thd, TABLE_LIST *tables)
'db' from all statistical tables: table_stats, column_stats, index_stats.
@retval
0 If all deletions are successful
0 If all deletions are successful or we couldn't open statistics table
@retval
1 Otherwise
@ -3325,7 +3326,8 @@ int read_statistics_for_tables_if_needed(THD *thd, TABLE_LIST *tables)
The function is called when executing the statement DROP TABLE 'tab'.
*/
int delete_statistics_for_table(THD *thd, const LEX_CSTRING *db, const LEX_CSTRING *tab)
int delete_statistics_for_table(THD *thd, const LEX_CSTRING *db,
const LEX_CSTRING *tab)
{
int err;
enum_binlog_format save_binlog_format;
@ -3333,11 +3335,15 @@ int delete_statistics_for_table(THD *thd, const LEX_CSTRING *db, const LEX_CSTRI
TABLE_LIST tables[STATISTICS_TABLES];
Open_tables_backup open_tables_backup;
int rc= 0;
bool has_error_active= thd->is_error();
DBUG_ENTER("delete_statistics_for_table");
if (open_stat_tables(thd, tables, &open_tables_backup, TRUE))
DBUG_RETURN(rc);
{
if (!has_error_active)
thd->clear_error();
DBUG_RETURN(0);
}
save_binlog_format= thd->set_current_stmt_binlog_format_stmt();
@ -3402,7 +3408,7 @@ int delete_statistics_for_table(THD *thd, const LEX_CSTRING *db, const LEX_CSTRI
'tab' from the statistical table column_stats.
@retval
0 If the deletion is successful
0 If all deletions are successful or we couldn't open statistics table
@retval
1 Otherwise
@ -3419,14 +3425,15 @@ int delete_statistics_for_column(THD *thd, TABLE *tab, Field *col)
TABLE_LIST tables;
Open_tables_backup open_tables_backup;
int rc= 0;
bool has_error_active= thd->is_error();
DBUG_ENTER("delete_statistics_for_column");
if (open_single_stat_table(thd, &tables, &stat_table_name[1],
&open_tables_backup, TRUE))
{
thd->clear_error();
DBUG_RETURN(rc);
if (!has_error_active)
thd->clear_error();
DBUG_RETURN(0);
}
save_binlog_format= thd->set_current_stmt_binlog_format_stmt();
@ -3468,7 +3475,7 @@ int delete_statistics_for_column(THD *thd, TABLE *tab, Field *col)
defined on the table 'tab' from the statistical table index_stats.
@retval
0 If the deletion is successful
0 If all deletions are successful or we couldn't open statistics table
@retval
1 Otherwise
@ -3486,14 +3493,15 @@ int delete_statistics_for_index(THD *thd, TABLE *tab, KEY *key_info,
TABLE_LIST tables;
Open_tables_backup open_tables_backup;
int rc= 0;
bool has_error_active= thd->is_error();
DBUG_ENTER("delete_statistics_for_index");
if (open_single_stat_table(thd, &tables, &stat_table_name[2],
&open_tables_backup, TRUE))
{
thd->clear_error();
DBUG_RETURN(rc);
if (!has_error_active)
thd->clear_error();
DBUG_RETURN(0);
}
save_binlog_format= thd->set_current_stmt_binlog_format_stmt();
@ -3563,8 +3571,10 @@ int delete_statistics_for_index(THD *thd, TABLE *tab, KEY *key_info,
The function is called when executing any statement that renames a table
*/
int rename_table_in_stat_tables(THD *thd, const LEX_CSTRING *db, const LEX_CSTRING *tab,
const LEX_CSTRING *new_db, const LEX_CSTRING *new_tab)
int rename_table_in_stat_tables(THD *thd, const LEX_CSTRING *db,
const LEX_CSTRING *tab,
const LEX_CSTRING *new_db,
const LEX_CSTRING *new_tab)
{
int err;
enum_binlog_format save_binlog_format;
@ -3575,7 +3585,9 @@ int rename_table_in_stat_tables(THD *thd, const LEX_CSTRING *db, const LEX_CSTRI
DBUG_ENTER("rename_table_in_stat_tables");
if (open_stat_tables(thd, tables, &open_tables_backup, TRUE))
{
DBUG_RETURN(0); // not an error
}
save_binlog_format= thd->set_current_stmt_binlog_format_stmt();
@ -3667,7 +3679,7 @@ int rename_column_in_stat_tables(THD *thd, TABLE *tab, Field *col,
TABLE_LIST tables;
Open_tables_backup open_tables_backup;
int rc= 0;
bool has_error_active= thd->is_error();
DBUG_ENTER("rename_column_in_stat_tables");
if (tab->s->tmp_table != NO_TMP_TABLE)
@ -3676,7 +3688,8 @@ int rename_column_in_stat_tables(THD *thd, TABLE *tab, Field *col,
if (open_single_stat_table(thd, &tables, &stat_table_name[1],
&open_tables_backup, TRUE))
{
thd->clear_error();
if (!has_error_active)
thd->clear_error();
DBUG_RETURN(rc);
}

25
sql/sql_table.cc
View File

@ -2040,18 +2040,6 @@ bool mysql_rm_table(THD *thd,TABLE_LIST *tables, bool if_exists,
if (!drop_temporary)
{
if (!in_bootstrap)
{
for (table= tables; table; table= table->next_local)
{
LEX_CSTRING db_name= table->db;
LEX_CSTRING table_name= table->table_name;
if (table->open_type == OT_BASE_ONLY ||
!thd->find_temporary_table(table))
(void) delete_statistics_for_table(thd, &db_name, &table_name);
}
}
if (!thd->locked_tables_mode)
{
if (drop_sequence)
@ -2115,6 +2103,18 @@ bool mysql_rm_table(THD *thd,TABLE_LIST *tables, bool if_exists,
}
}
}
/* We remove statistics for table last, after we have the DDL lock */
if (!in_bootstrap)
{
for (table= tables; table; table= table->next_local)
{
LEX_CSTRING db_name= table->db;
LEX_CSTRING table_name= table->table_name;
if (table->open_type == OT_BASE_ONLY ||
!thd->find_temporary_table(table))
(void) delete_statistics_for_table(thd, &db_name, &table_name);
}
}
}
/* mark for close and remove all cached entries */
@ -2127,7 +2127,6 @@ bool mysql_rm_table(THD *thd,TABLE_LIST *tables, bool if_exists,
DBUG_RETURN(TRUE);
my_ok(thd);
DBUG_RETURN(FALSE);
}