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https://issues.apache.org/jira/browse/TWILL-70?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13966021#comment-13966021
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Andreas Neumann commented on TWILL-70:
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I published a review for this: https://reviews.apache.org/r/20241/

> A an option to debug runnables
> ------------------------------
>
>                 Key: TWILL-70
>                 URL: https://issues.apache.org/jira/browse/TWILL-70
>             Project: Apache Twill
>          Issue Type: New Feature
>          Components: yarn
>            Reporter: Andreas Neumann
>            Assignee: Andreas Neumann
>
> Trouble-shooting distributed apps is hard. One of the challenges is to see 
> what is going on inside a runnable. This will add the ability to attach a 
> remote debugger to a Twill runnable.: An option to start some or all 
> runnables with the debugging port open. The port cannot be fixed because that 
> could cause conflicts between multiple runnables. Therefore the runnable 
> detects a free port and uses that, and communicates that port back to the 
> client via the run resources call of the controller.



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