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Date: Fri, 31 Aug 2012 11:25:08 +1100 (NCT)
From: "Lars Hofhansl (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <591401934.19538.1346372708712.JavaMail.jiratomcat@arcas>
In-Reply-To: <814781729.7951.1345761162669.JavaMail.jiratomcat@arcas>
Subject: [jira] [Assigned] (HBASE-6647) [performance regression]
 appendNoSync/HBASE-4528 doesn't take deferred log flush into account
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     [ https://issues.apache.org/jira/browse/HBASE-6647?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl reassigned HBASE-6647:
------------------------------------

    Assignee: Jean-Daniel Cryans
    
> [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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