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https://issues.apache.org/jira/browse/HADOOP-6640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851085#action_12851085
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Hairong Kuang commented on HADOOP-6640:
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Then this means every future RPC call of DFSClient requires a check if a
DFSClient has been initialized or not.
> FileSystem.get() does RPC retries within a static synchronized block
> --------------------------------------------------------------------
>
> Key: HADOOP-6640
> URL: https://issues.apache.org/jira/browse/HADOOP-6640
> Project: Hadoop Common
> Issue Type: Bug
> Environment: all
> Reporter: Alejandro Abdelnur
> Assignee: Hairong Kuang
> Priority: Critical
>
> If using FileSystem.get() in a multithreaded environment, and one get() locks
> because the NN URI is too slow or not responding and retries are in progress,
> all other get() (for the diffferent users, NN) are blocked.
> the synchronized block in in the static instance of Cache inner class.
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