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From "Brandon Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2533) Remove needless synchronization on FSDataSet.getBlockFile
Date Wed, 25 Jul 2012 01:27:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421925#comment-13421925
] 

Brandon Li commented on HDFS-2533:
----------------------------------

I did teragen/terasort/teravalid with the branch-1 patch and noticed some performance gain
in terasort and teravalid, no noticeable performance gain with teragen.
                
> Remove needless synchronization on FSDataSet.getBlockFile
> ---------------------------------------------------------
>
>                 Key: HDFS-2533
>                 URL: https://issues.apache.org/jira/browse/HDFS-2533
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node, performance
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Minor
>             Fix For: 0.24.0, 0.23.1
>
>         Attachments: HDFS-2533.branch-1.patch, hdfs-2533.txt, hdfs-2533.txt
>
>
> HDFS-1148 discusses lock contention issues in FSDataset. It provides a more comprehensive
fix, converting it all to RWLocks, etc. This JIRA is for one very specific fix which gives
a decent performance improvement for TestParallelRead: getBlockFile() currently holds the
lock which is completely unnecessary.

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