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https://issues.apache.org/jira/browse/HADOOP-12523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14977828#comment-14977828
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Tsz Wo Nicholas Sze commented on HADOOP-12523:
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I suggest that the closeAll methods (1) acquire the lock, (2) generate a list
of target FileSystem objects and remove them from the cache, (3) release the
lock, and (4) close the FileSystem objects in the list.
> In FileSystem.Cache, the closeAll methods should not synchronize on the Cache
> object
> ------------------------------------------------------------------------------------
>
> Key: HADOOP-12523
> URL: https://issues.apache.org/jira/browse/HADOOP-12523
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
>
> All the closeAll methods holds the Cache lock so that when one of the three
> closeAll methods is being called, a new FileSystem object has to wait for the
> Cache lock. The wait time can possible be long since closing a FileSystem
> can be slow.
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