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Optimize flush tables with read lock (FTWRL) to not wait for select's

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Part of MDEV-5336 Implement LOCK FOR BACKUP

The idea is that instead of waiting in close_cached_tables() for all
tables to be closed, we instead call flush_tables() that does:
- Flush not used objects in table cache to free memory
- Collect all tables that are open
- Call HA_EXTRA_FLUSH on the objects, to get them into "closed state"
- Added HA_EXTRA_FLUSH support to archive and CSV
- Added multi-user protection to HA_EXTRA_FLUSH in MyISAM and Aria

The benefit compared to old code is:
- FTWRL doesn't have to wait for long running read operations or
  open HANDLER's
This commit is contained in:
Monty
2018-10-09 18:55:18 +03:00
parent 306b7a2243
commit 163b34fe25
35 changed files with 456 additions and 81 deletions
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sql/sql_handler.h
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@@ -73,6 +73,7 @@ bool mysql_ha_read(THD *, TABLE_LIST *,enum enum_ha_read_modes, const char *,
void mysql_ha_flush(THD *thd);
void mysql_ha_flush_tables(THD *thd, TABLE_LIST *all_tables);
void mysql_ha_rm_tables(THD *thd, TABLE_LIST *tables);
void mysql_ha_cleanup_no_free(THD *thd);
void mysql_ha_cleanup(THD *thd);
void mysql_ha_set_explicit_lock_duration(THD *thd);
void mysql_ha_rm_temporary_tables(THD *thd);