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https://issues.apache.org/jira/browse/HDFS-980?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dhruba borthakur resolved HDFS-980.
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Resolution: Duplicate
Duplicate of HDFS-1093
> 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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