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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-980) Convert FSNamesystem lock to ReadWriteLock
Date Tue, 16 Feb 2010 04:16:27 GMT
Convert FSNamesystem lock to ReadWriteLock

                 Key: HDFS-980
                 URL: https://issues.apache.org/jira/browse/HDFS-980
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: name-node
    Affects Versions: 0.22.0
            Reporter: Todd Lipcon

As Dhruba noted [here|https://issues.apache.org/jira/browse/HDFS-909?focusedCommentId=12834051&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12834051]
 there would be substantial benefits to converting the FSNamesystem lock over to a ReadWriteLock.
The first would be an ability to provide concurrent readers with a throughput increase, and
the second would be more safety for operations like in HDFS-909.

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