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Proper locking for mysql.gtid_slave_pos truncation

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Aim of this patch is to remove tdc_remove_table(TDC_RT_REMOVE_UNUSED),
which was mistakenly introduced by 055a3334a.

InnoDB allows only one open TABLE instance while performing table
truncation. To fulfill this requirement:
1. MDL_EXCLUSIVE has to be acquired to block concurrent threads from
   accessing given table
2. cached TABLE instances have to be flushed
3. another InnoDB requirement is such that TABLE_SHARE and remaining
   TABLE instance have to be invalidated and re-opened after truncation

This goes more or less inline with what regular TRUNCATE TABLE does.

Alternative solution would be handler::ha_delete_all_rows(), but InnoDB
doesn't implement it unfortunately.

Part of MDEV-17882 - Cleanup refresh version
This commit is contained in:
Sergey Vojtovich 2019-12-17 23:00:23 +04:00
parent bfdd30d3e9
commit 14e1385691
1 changed files with 2 additions and 1 deletions
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3
sql/rpl_gtid.cc
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@ -425,11 +425,12 @@ rpl_slave_state::truncate_state_table(THD *thd)
tlist.init_one_table(&MYSQL_SCHEMA_NAME, &rpl_gtid_slave_state_table_name,
NULL, TL_WRITE);
tlist.mdl_request.set_type(MDL_EXCLUSIVE);
if (!(err= open_and_lock_tables(thd, &tlist, FALSE,
MYSQL_OPEN_IGNORE_LOGGING_FORMAT)))
{
DBUG_ASSERT(!tlist.table->file->row_logging);
tdc_remove_table(thd, TDC_RT_REMOVE_UNUSED, "mysql",
tdc_remove_table(thd, TDC_RT_REMOVE_NOT_OWN, "mysql",
rpl_gtid_slave_state_table_name.str);
err= tlist.table->file->ha_truncate();