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https://issues.apache.org/jira/browse/HDFS-16973?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Íñigo Goiri resolved HDFS-16973.
--------------------------------
    Fix Version/s: 3.4.0
     Hadoop Flags: Reviewed
       Resolution: Fixed

> 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
>             Fix For: 3.4.0
>
>
> 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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