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| author | Monty <monty@mariadb.org> | 2018-10-09 18:55:18 +0300 |
|---|---|---|
| committer | Monty <monty@mariadb.org> | 2018-12-09 22:12:25 +0200 |
| commit | 163b34fe25919b25ff83860f30f2440b44c8b53b (patch) | |
| tree | 7d21575247bdba318889ad4bc650028e59549781 /sql/table_cache.h | |
| parent | 306b7a2243eb3c3e8dcc567ef6d4e7e50dca21a4 (diff) | |
| download | mariadb-git-163b34fe25919b25ff83860f30f2440b44c8b53b.tar.gz | |
Optimize flush tables with read lock (FTWRL) to not wait for select's
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
Diffstat (limited to 'sql/table_cache.h')
| -rw-r--r-- | sql/table_cache.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sql/table_cache.h b/sql/table_cache.h index b41665258c9..148edc84223 100644 --- a/sql/table_cache.h +++ b/sql/table_cache.h @@ -88,7 +88,6 @@ extern bool tdc_remove_table(THD *thd, enum_tdc_remove_table_type remove_type, const char *db, const char *table_name, bool kill_delayed_threads); - extern int tdc_wait_for_old_version(THD *thd, const char *db, const char *table_name, ulong wait_timeout, uint deadlock_weight, @@ -102,6 +101,7 @@ extern uint tc_records(void); extern void tc_purge(bool mark_flushed= false); extern void tc_add_table(THD *thd, TABLE *table); extern void tc_release_table(TABLE *table); +extern TABLE *tc_acquire_table(THD *thd, TDC_element *element); /** Create a table cache key for non-temporary table. |