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https://issues.apache.org/jira/browse/ACCUMULO-487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13432157#comment-13432157
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John Stoneham commented on ACCUMULO-487:
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Would it be possible to have this fix backported to 1.3.x for those of us whose 
systems haven't been upgraded to 1.4 yet? This leaks a lot of threads for our 
use case and eventually runs the process out of threads.
                
> Batch Scanner can get stuck when external thread closes scanner
> ---------------------------------------------------------------
>
>                 Key: ACCUMULO-487
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-487
>             Project: Accumulo
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 1.4.0, 1.3.5
>            Reporter: John Vines
>            Assignee: Keith Turner
>              Labels: newbie
>             Fix For: 1.5.0, 1.4.1
>
>
> Scenario- client is using batch scanner to run queries with complex server 
> side iterators. They run long. User has external thread which determines 
> thread is running long, so that thread calls close on the batch scanner. 
> Query threads exit nicely, but there is a thread which is constantly polling 
> an internal queue. It only breaks out of that loop if there is a next key or 
> an error thrown. If neither occur, it continues to poll. We should probably 
> have an exit condition get set on close() which is used in that query loop.

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