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https://issues.apache.org/jira/browse/HDFS-9524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15056466#comment-15056466
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Bob Hansen commented on HDFS-9524:
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Oh!  You are correct; that failure was masked by HDFS-9523.  New patch attached.

> libhdfs++ deadlocks in Filesystem::New if NN conneciton fails
> -------------------------------------------------------------
>
>                 Key: HDFS-9524
>                 URL: https://issues.apache.org/jira/browse/HDFS-9524
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: Bob Hansen
>            Assignee: Bob Hansen
>         Attachments: HDFS-9524.HDFS-8707.000.patch
>
>
> FileSystem::New attempts to free the new FileSystem if the connection fails.  
> Unfortunately, it's in the middle of a callback from the filesystem's 
> threadpool, and attempts to join the worker thread while running the worker 
> thread.



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