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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7052) RM SchedulingMonitor gives no indication why the spawned thread crashed.
Date Fri, 25 Aug 2017 20:59:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16142187#comment-16142187

Hudson commented on YARN-7052:

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #12244 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/12244/])
YARN-7052. RM SchedulingMonitor gives no indication why the spawned (jlowe: rev 39a9dc8e4a6e1d13658867ad756878d3dd6352b0)
* (edit) hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/monitor/SchedulingMonitor.java

> RM SchedulingMonitor gives no indication why the spawned thread crashed.
> ------------------------------------------------------------------------
>                 Key: YARN-7052
>                 URL: https://issues.apache.org/jira/browse/YARN-7052
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: yarn
>            Reporter: Eric Payne
>            Assignee: Eric Payne
>            Priority: Critical
>             Fix For: 2.9.0, 3.0.0-beta1, 2.8.2
>         Attachments: YARN-7052.001.patch
> In YARN-7051, we ran into a case where the preemption monitor thread hung with no indication
of why.
> The preemption monitor is started by the {{SchedulingExecutorService}} from {{SchedulingMonitor#serviceStart}}.
Once an uncaught throwable happens, nothing ever gets the result of the future, the thread
running the preemption monitor never dies, and it never gets rescheduled.
> If {{HadoopExecutor}} were used, it would at least provide a {{HadoopScheduledThreadPoolExecutor}}
that logs the exception if one happens.

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