Convert FSNamesystem lock to ReadWriteLock
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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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