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Date: Thu, 3 Nov 2011 01:21:32 +0000 (UTC)
From: "Hudson (Commented) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-2533) Remove needless synchronization on
 FSDataSet.getBlockFile
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    [ https://issues.apache.org/jira/browse/HDFS-2533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13142758#comment-13142758 ] 

Hudson commented on HDFS-2533:
------------------------------

Integrated in Hadoop-Common-0.23-Commit #139 (See [https://builds.apache.org/job/Hadoop-Common-0.23-Commit/139/])
    HDFS-2533. Remove needless synchronization on some FSDataSet methods. Contributed by Todd Lipcon.

todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1196901
Files : 
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/FSDataset.java

                
> 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.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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