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