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https://issues.apache.org/jira/browse/YARN-41?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14543929#comment-14543929
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Devaraj K commented on YARN-41:
-------------------------------
|| NM Graceful Shutdown||NM Recovery
Enabled\\yarn.nodemanager.recovery.enabled=true||NM is Running Under
Supervision\\yarn.nodemanager.recovery.supervised=true||*NM Unregister*||
|Y |N | Y || *Y* ||
|Y |N | N || *Y* ||
|Y |Y | Y || *N* ||
|Y |Y | N || *N* ||
|N |Y/N | Y/N || *N* ||
\\
\\
* If the NM shutdown is graceful and NM recovery is not enabled then NM
unregisters with RM. Here, irrespective of NM is under supervision or not if
the NM recovery is not enabled then NM will unregister with RM.
* If the NM shutdown is graceful and NM recovery is enabled then NM will not
unregister with RM.
* If the NM gets killed abruptly(using kill -9 nm-pid) then NM will not
unregister with RM as the process itself will not be available to notify
anything.
As per my understanding I assumed here that NM is under supervision enabled
only when the NM recovery is enabled. Please correct me If I am wrong.
Please give your comments, I will update the patch accordingly if there are no
issues on this.
> The RM should handle the graceful shutdown of the NM.
> -----------------------------------------------------
>
> Key: YARN-41
> URL: https://issues.apache.org/jira/browse/YARN-41
> Project: Hadoop YARN
> Issue Type: New Feature
> Components: nodemanager, resourcemanager
> Reporter: Ravi Teja Ch N V
> Assignee: Devaraj K
> Labels: BB2015-05-TBR
> Attachments: MAPREDUCE-3494.1.patch, MAPREDUCE-3494.2.patch,
> MAPREDUCE-3494.patch, YARN-41-1.patch, YARN-41-2.patch, YARN-41-3.patch,
> YARN-41-4.patch, YARN-41.patch
>
>
> Instead of waiting for the NM expiry, RM should remove and handle the NM,
> which is shutdown gracefully.
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