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Posted to issues@hbase.apache.org by "Zhihong Ted Yu (JIRA)" <ji...@apache.org> on 2012/08/24 03:01:43 UTC
[jira] [Commented] (HBASE-6647) [performance regression]
appendNoSync/HBASE-4528 doesn't take deferred log flush into account
[ https://issues.apache.org/jira/browse/HBASE-6647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13440841#comment-13440841 ]
Zhihong Ted Yu commented on HBASE-6647:
---------------------------------------
Patch looks good.
> [performance regression] appendNoSync/HBASE-4528 doesn't take deferred log flush into account
> ---------------------------------------------------------------------------------------------
>
> Key: HBASE-6647
> URL: https://issues.apache.org/jira/browse/HBASE-6647
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.94.0
> Reporter: Jean-Daniel Cryans
> Fix For: 0.96.0, 0.94.2
>
> Attachments: HBASE-6647-0.94.patch
>
>
> Since we upgraded to 0.94.1 from 0.92 I saw that our ICVs are about twice as slow as they were. jstack'ing I saw that most of the time we are waiting on sync()... but those tables have deferred log flush turned on so they shouldn't even be calling it.
> HTD.isDeferredLogFlush is currently only called in the append() methods which are pretty much not in use anymore.
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