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https://issues.apache.org/jira/browse/HDFS-13745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16588924#comment-16588924
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Anatoli Shein commented on HDFS-13745:
--------------------------------------

Also, can we submit another CI run for this? Looks like the previous one didn't 
run for some reason.

> libhdfs++: Fix race in FileSystem destructor
> --------------------------------------------
>
>                 Key: HDFS-13745
>                 URL: https://issues.apache.org/jira/browse/HDFS-13745
>             Project: Hadoop HDFS
>          Issue Type: Task
>          Components: native
>            Reporter: James Clampffer
>            Assignee: James Clampffer
>            Priority: Major
>         Attachments: HDFS-13745.000.patch
>
>
> Whatever happens to have the last shared_ptr to the IoService will run 
> ~IoService when the shared_ptr goes out of scope.  IoService's destructor is 
> responsible for joining all worker threads in the pool.  Most callbacks now 
> own weak_ptr<IoService> that can be promoted to a shared_ptr in order to post 
> new async tasks.  If a callback object is the last thing holding the 
> IoService shared_ptr it's going to try to join the thread pool inside of one 
> of the thread pool's threads.



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