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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2533) Remove needless synchronization on FSDataSet.getBlockFile
Date Wed, 02 Nov 2011 20:45:32 GMT
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
    Affects Versions: 0.23.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Minor


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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