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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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5
mysql-test/main/flush.result
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@ -472,10 +472,7 @@ create table t1 (i int);
create table t2 (i int);
handler t1 open;
connection con1;
# Sending:
flush tables with read lock;
connection con2;
# Wait until FTWRL starts waiting for 't1' to be closed.
connection default;
# The below statement should not cause deadlock.
# Sending:
@ -483,8 +480,6 @@ insert into t2 values (1);
connection con2;
# Wait until INSERT starts to wait for FTWRL to go away.
connection con1;
# FTWRL should be able to continue now.
# Reap FTWRL.
unlock tables;
connection default;
# Reap INSERT.