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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4676) Foreman.moveToState can block forever if called by the foreman thread while the query is still being setup
Date Tue, 17 May 2016 00:04:12 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15285689#comment-15285689
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ASF GitHub Bot commented on DRILL-4676:
---------------------------------------

Github user adeneche commented on the pull request:

    https://github.com/apache/drill/pull/503#issuecomment-219583987
  
    I made a quick change to address Sudheesh concern about deferring processing events when
the query is queued. This is a WIP to see if I am not missing anything obvious, will clean/rename/document
once we agree this is a correct fix


> Foreman.moveToState can block forever if called by the foreman thread while the query
is still being setup
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: DRILL-4676
>                 URL: https://issues.apache.org/jira/browse/DRILL-4676
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Flow
>    Affects Versions: 1.6.0
>            Reporter: Deneche A. Hakim
>            Assignee: Sudheesh Katkam
>             Fix For: 1.7.0
>
>
> When the query is being setup, foreman has a special CountDownLatch that blocks rpc threads
from delivering external events, this latch is unblocked at the end of the query setup.
> In some cases though, when the foreman is submitting remote fragments, a failure in RpcBus.send()
causes an exception to be thrown that is reported to 
> Foreman.FragmentSubmitListener and blocks in the CountDownLatch. This causes the foreman
thread to block forever, and can rpc threads to be blocked too.
> This seems to happen more frequently at a high concurrency load, and also can prevent
clients from connecting to the Drillbits.



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