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https://issues.apache.org/jira/browse/BOOKKEEPER-538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13547816#comment-13547816
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Ivan Kelly commented on BOOKKEEPER-538:
---------------------------------------

awaitTermination doesn't force anything. It waits until any operations on the 
scheduler finish. #shutdownNow will force the operations to finish, but this 
patch doesn't use that. I'm making a few changes now, and will attach a new 
patch shortly.
                
> Race condition in BookKeeper#close
> ----------------------------------
>
>                 Key: BOOKKEEPER-538
>                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-538
>             Project: Bookkeeper
>          Issue Type: Bug
>            Reporter: Ivan Kelly
>            Assignee: Ivan Kelly
>             Fix For: 4.2.0
>
>         Attachments: 
> 0001-BOOKKEEPER-538-Race-condition-in-BookKeeper-close.patch
>
>
> I've seen this with BookieAutoRecoveryTest. Basically, we interrupt and join 
> the replicationworker thread, and then close the BookKeeper instance. This 
> can have caused a bookkeeper operation that never finished. The executor runs 
> it after #close has closed the BookieClient. The operation opens a connection 
> and therefore we get a hang on releaseExternalResources(). 
> Solution is pretty simple. We should shutdown all executors before closing 
> the bookieClient. I'll attach a patch which does this.

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