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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6647) [performance regression] appendNoSync/HBASE-4528 doesn't take deferred log flush into account
Date Fri, 31 Aug 2012 05:11:08 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13445670#comment-13445670
] 

Lars Hofhansl commented on HBASE-6647:
--------------------------------------

Thanks J-D!
                
> [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
>            Assignee: Jean-Daniel Cryans
>             Fix For: 0.96.0, 0.94.2
>
>         Attachments: HBASE-6647-0.94.patch, HBASE-6647-0.94-v2.patch, HBASE-6647-0.94-v3.patch,
HBASE-6647.pach
>
>
> 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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