database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-08-08 11:22:35 +03:00
Code Activity

MDEV-33668: More precise dependency tracking of XA XID in parallel replication

Browse Source 
Keep track of each recently active XID, recording which worker it was queued
on. If an XID might still be active, choose the same worker to queue event
groups that refer to the same XID to avoid conflicts.

Otherwise, schedule the XID freely in the next round-robin slot.

This way, XA PREPARE can normally be scheduled without restrictions (unless
duplicate XID transactions come close together). This improves scheduling
and parallelism over the old method, where the worker thread to schedule XA
PREPARE on was fixed based on a hash value of the XID.

XA COMMIT will normally be scheduled on the same worker as XA PREPARE, but
can be a different one if the XA PREPARE is far back in the event history.

Testcase and code for trimming dynamic array due to Andrei.

Reviewed-by: Andrei Elkin <andrei.elkin@mariadb.com>
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>
This commit is contained in:
Kristian Nielsen
2024-02-27 19:08:20 +01:00
committed by Andrei
parent f9ecaa87ce
commit d90a2b44ad
5 changed files with 391 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
mysql-test/suite/rpl/r/rpl_parallel_multi_domain_xa.result Normal file
View File

@@ -0,0 +1,55 @@
include/master-slave.inc
[connection master]
call mtr.add_suppression("Deadlock found when trying to get lock; try restarting transaction");
call mtr.add_suppression("WSREP: handlerton rollback failed");
connection master;
ALTER TABLE mysql.gtid_slave_pos ENGINE=InnoDB;
connection slave;
include/stop_slave.inc
SET @old_parallel_threads = @@GLOBAL.slave_parallel_threads;
SET @old_slave_domain_parallel_threads = @@GLOBAL.slave_domain_parallel_threads;
SET @@global.slave_parallel_threads = 5;
SET @@global.slave_domain_parallel_threads = 3;
SET @old_parallel_mode = @@GLOBAL.slave_parallel_mode;
CHANGE MASTER TO master_use_gtid=slave_pos;
connection master;
CREATE TABLE t1 (a int PRIMARY KEY, b INT) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1, 0);
include/save_master_gtid.inc
connection slave;
include/start_slave.inc
include/sync_with_master_gtid.inc
include/stop_slave.inc
SET @@global.slave_parallel_mode ='optimistic';
connection master;
include/save_master_gtid.inc
connection slave;
include/start_slave.inc
include/sync_with_master_gtid.inc
include/stop_slave.inc
connection master;
include/save_master_gtid.inc
connection slave;
SET @@global.slave_parallel_mode ='conservative';
include/start_slave.inc
include/sync_with_master_gtid.inc
include/stop_slave.inc
include/save_master_gtid.inc
connection slave;
SET @@global.slave_parallel_mode = 'optimistic';
include/start_slave.inc
include/sync_with_master_gtid.inc
include/diff_tables.inc [master:t1, slave:t1]
connection slave;
include/stop_slave.inc
SET @@global.slave_parallel_mode = @old_parallel_mode;
SET @@global.slave_parallel_threads = @old_parallel_threads;
SET @@global.slave_domain_parallel_threads = @old_slave_domain_parallel_threads;
include/start_slave.inc
connection master;
DROP TABLE t1;
include/save_master_gtid.inc
connection slave;
include/sync_with_master_gtid.inc
connection master;
include/rpl_end.inc