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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 18:08:12 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15287144#comment-15287144
] 

ASF GitHub Bot commented on DRILL-4676:
---------------------------------------

Github user sudheeshkatkam commented on a diff in the pull request:

    https://github.com/apache/drill/pull/503#discussion_r63574135
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/work/foreman/Foreman.java
---
    @@ -1191,7 +1195,7 @@ public void failed(final RpcException ex) {
           } else {
             // since this won't be waited on, we can wait to deliver this event once the
Foreman is ready
             logger.debug("Failure while sending fragment.  Stopping query.", ex);
    -        stateListener.moveToState(QueryState.FAILED, ex);
    --- End diff --
    
    Please add a note about deferring this.


> 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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