Junping Du commented on YARN-1362:

Thanks for the patch, [~jlowe]! I just start to work on rolling upgrade so need 
to understand the preserving work in NM restart.
One question here: do we expect all shutdown ops on NM will hint it will get 
restart soon? If not, the work will be preserved as isDecommssioned is set to 
false by default. Is that the behavior we expect? 

> Distinguish between nodemanager shutdown for decommission vs shutdown for 
> restart
> ---------------------------------------------------------------------------------
>                 Key: YARN-1362
>                 URL: https://issues.apache.org/jira/browse/YARN-1362
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager
>    Affects Versions: 2.3.0
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>         Attachments: YARN-1362.patch
> When a nodemanager shuts down it needs to determine if it is likely to be 
> restarted.  If a restart is likely then it needs to preserve container 
> directories, logs, distributed cache entries, etc.  If it is being shutdown 
> more permanently (e.g.: like a decommission) then the nodemanager should 
> cleanup directories and logs.

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