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https://issues.apache.org/jira/browse/YARN-5609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15503725#comment-15503725
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Jian He commented on YARN-5609:
-------------------------------

- Can you add comments in commitLastReInitialization that once committed, user 
will not be able to rollback.
- shouldn't set it to null?
{code}
      ContainerLaunchContext launchContext =
          reInitEvent.getReInitLaunchContext() == null ?
              container.launchContext : null;
{code}
- how about RestartResponse-> RestartContainerResponse, 
ReInitializationRequest-> ReInitializeContainerRequest ?

> Expose upgrade and restart API in ContainerManagementProtocol
> -------------------------------------------------------------
>
>                 Key: YARN-5609
>                 URL: https://issues.apache.org/jira/browse/YARN-5609
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Arun Suresh
>            Assignee: Arun Suresh
>         Attachments: YARN-5609.001.patch
>
>
> YARN-5620 and YARN-5637 allows an AM to explicitly *upgrade* a container with 
> a new launch context and subsequently *rollback* / *commit* the change on the 
> Container. This can also be used to simply *restart* the Container as well. 
> This JIRA proposes to extend the ContainerManagementProtocol with the 
> following API:
> * *upgradeContainer*
> * *rollbackLastUpgrade*
> * *commitLastUpgrade*
> * *restartContainer*



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