Andy, I do have innodb_flush_log_at_trx_commit=2 and sync_binlog=0. Yes I know it is … rather for other nodes joining cluster. Please note that effect broken group commit you will see rather on slow disks or RAID with… Fusion-io cards as in this case, the problem with group commit is not significant.
Comment: Benchmarking Galera replication overhead
October 14, 2011 By 12 Comments
…_xa? 3) What values of innodb_flush_log_at_trx_commit did you use? 4) You mentioned “main overhead may coming… every single transaction? Or does it use some sort of “group commit” for writing to write sets to disk? 5) I’m… than regular replication. When binlog & sync_bonlog are enabled, group commit is broken and performance can drop by over 90%. Since Galera doesn…
Post: How much overhead DRDB could cause ?
June 2, 2008 By 4 Comments
… in Innodb log to commit it and finally there is record in Binary log to commit transaction followed by commit transaction in Innodb… lot of synchronous writes which are fully serialized because group commit in Innodb was broken in 5.0 and it is still not… operations required – which we counted to be 4 per transaction commit, or could be more than 6 depending on how Filesystem…
Comment: Heikki Tuuri to answer your in depth Innodb questions
September 28, 2007 By 51 Comments
… the necessary patches. Also, What’s the deal with group commit being broken in 5.1.x? Is it possible to get the… support (which we don’t use) then you’ll get group commit again.
Post: When would you use SAN with MySQL ?
March 9, 2009 By 18 Comments
… binary log flushed on commit too. MySQL also has broken group commit (which we have partial fix for) meaning concurrent transaction commits will need to…
Comment: Jeremy Cole on MySQL Replication
June 14, 2006 By 12 Comments
…) UPDATE . . .. (modify some rows in the buffer pool (in memory) COMMIT–>write (a delta?) to innodb-log-file AND write statements… of a crash? Also, as you mentioned the issue of group commit being broken (see
Post: Announcing Percona Server 5.5.27-29.0
October 11, 2012 By Leave a Comment
… (George Ormond Lorch III). Option expire_logs_days was broken by group_commit patch introduced in Percona Server 5.5.18-23.0…
Comment: FlashCache: tpcc workload with FusionIO card as cache
June 11, 2010 By 20 Comments
… FusionIO as well? Do you use binlog? Group commit is reportedly to be still broken when binlog is enabled (http://kristiannielsen.livejournal.com…
Comment: How fast is FLUSH TABLES WITH READ LOCK?
April 25, 2010 By 30 Comments
Peter, We can port START TRANSACTION WITH CONSISTENT INNODB SNAPSHOT to Percona Server, and I also wait for Facebook’s fix of broken group commit. That will be really great combination.
Comment: Group commit and real fsync
November 20, 2007 By 9 Comments
[...] originally performed InnoDB scalability tests for MySQL 5.0 to show broken group commit [...]
