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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5937) stop-yarn.sh is not able to gracefully stop node managers
Date Tue, 03 Jan 2017 06:14:58 GMT

    [ https://issues.apache.org/jira/browse/YARN-5937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15794274#comment-15794274
] 

Weiwei Yang commented on YARN-5937:
-----------------------------------

Hello [~Naganarasimha]

Do you have any suggestions to the fix I proposed? Would you like to review this patch? Thanks
a lot.

> stop-yarn.sh is not able to gracefully stop node managers
> ---------------------------------------------------------
>
>                 Key: YARN-5937
>                 URL: https://issues.apache.org/jira/browse/YARN-5937
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Weiwei Yang
>            Assignee: Weiwei Yang
>              Labels: script
>         Attachments: YARN-5937.01.patch, nm_shutdown.log
>
>
> stop-yarn.sh always gives following output
> {code}
> ./sbin/stop-yarn.sh
> Stopping resourcemanager
> Stopping nodemanagers
> <NM_HOST>: WARNING: nodemanager did not stop gracefully after 5 seconds: Trying
to kill with kill -9
> <NM_HOST>: ERROR: Unable to kill 18097
> {code}
> this was because resource manager is stopped before node managers, when the shutdown
hook manager tries to gracefully stop NM services, NM needs to unregister with RM, and it
gets timeout as NM could not connect to RM (already stopped). See log (stop RM then run kill
<nm_pid>)
> {code}
> 16/11/28 08:26:43 ERROR nodemanager.NodeManager: RECEIVED SIGNAL 15: SIGTERM
> ...
> 16/11/28 08:26:53 WARN util.ShutdownHookManager: ShutdownHook 'CompositeServiceShutdownHook'
timeout, java.util.concurrent.TimeoutException
> java.util.concurrent.TimeoutException
> 	at java.util.concurrent.FutureTask.get(FutureTask.java:205)
> 	at org.apache.hadoop.util.ShutdownHookManager$1.run(ShutdownHookManager.java:67)
> ...
> 	at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.unRegisterNM(NodeStatusUpdaterImpl.java:291)
> ...
> 16/11/28 08:27:13 ERROR util.ShutdownHookManager: ShutdownHookManger shutdown forcefully.
> {code}
> the shutdown hooker has a default of 10s timeout, so if RM is stopped before NMs, they
always took more than 10s to stop (in java code). However stop-yarn.sh only gives 5s timeout,
so NM is always killed instead of stopped.
> It would make sense to stop NMs before RMs in this script, in a graceful way.



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