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https://issues.apache.org/jira/browse/HDFS-16973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17709111#comment-17709111
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ASF GitHub Bot commented on HDFS-16973:
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goiri merged PR #5533:
URL: https://github.com/apache/hadoop/pull/5533
> RBF: MountTableResolver cache size lookup should take read lock
> ---------------------------------------------------------------
>
> Key: HDFS-16973
> URL: https://issues.apache.org/jira/browse/HDFS-16973
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Viraj Jasani
> Assignee: Viraj Jasani
> Priority: Major
> Labels: pull-request-available
>
> Mount table resolver location cache gets invalidated by taking write lock as
> part of addEntry/removeEntry/refreshEntries calls. Since the write lock
> exclusively updates the cache, getDestinationForPath already takes read lock
> before accessing the cache. Similarly, retrieval of the cache size should
> also take the read lock.
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