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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15527) Sometimes daemons keep running even after "kill -9" from daemon-stop script
Date Thu, 14 Jun 2018 13:23:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16512458#comment-16512458
] 

Steve Loughran commented on HADOOP-15527:
-----------------------------------------

normal {{kill}} calls can hang if something blocks in shutdown, including HDFS. If you implement
your entry point atop {{org.apache.hadoop.service.launcher}}, you'll see its interrupt handler,
{{InterruptEscalator}} will (a) add a timeout to shutdown and call JVM exit if it takes too
long, and (b) treat a second kill as a request to exit hard, not retry a clean shutdown. It
should be picked up as the entry point.

> Sometimes daemons keep running even after "kill -9" from daemon-stop script
> ---------------------------------------------------------------------------
>
>                 Key: HADOOP-15527
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15527
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Vinod Kumar Vavilapalli
>            Priority: Major
>             Fix For: 3.2.0, 3.1.1
>
>         Attachments: HADOOP-15527.1.txt, HADOOP-15527.2.txt, HADOOP-15527.txt
>
>
> I'm seeing that sometimes daemons keep running for a little while even after "kill -9"
from daemon-stop scripts.
> Debugging more, I see several instances of "ERROR: Unable to kill ${pid}".
> Saw this specifically with ResourceManager & NodeManager -  {{yarn --daemon stop
nodemanager}}. Though it is possible that other daemons may run into this too.
> Saw this on both Centos as well as Ubuntu.



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