sandflee commented on YARN-3328:

Is there any necessary to keep containers info in NMClientAsync?  YARN-3327 
also caused by this.

> There's no way to rebuild containers Managed by NMClientAsync If AM restart
> ---------------------------------------------------------------------------
>                 Key: YARN-3328
>                 URL: https://issues.apache.org/jira/browse/YARN-3328
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: api, applications, client
>    Affects Versions: 2.6.0
>            Reporter: sandflee
> If work preserving is enabled and AM restart, AM could't stop containers  
> launched by pre-am, because there's no corresponding container in 
> NMClientAsync.containers.
>  Thereā€˜s no way to rebuild NMClientAsync.containers.

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