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https://issues.apache.org/jira/browse/SLIDER-476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14157205#comment-14157205
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Steve Loughran commented on SLIDER-476:
---------------------------------------

needs two threads, as #1 is the thread that takes from the scheduled queue and 
pushes to the immediate queue

> make AM queue executor non-reentrant
> ------------------------------------
>
>                 Key: SLIDER-476
>                 URL: https://issues.apache.org/jira/browse/SLIDER-476
>             Project: Slider
>          Issue Type: Improvement
>          Components: appmaster
>    Affects Versions: Slider 0.50
>            Reporter: Steve Loughran
>             Fix For: Slider 0.60
>
>   Original Estimate: 0.25h
>  Remaining Estimate: 0.25h
>
> Make the thread executor single thread, not parallel, so there's no need to 
> worry about simultaneous handling events coming in.



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