Jun Gong commented on YARN-3809:

Thanks [~rohithsharma], [~devaraj.k] and [~kasha] for comments and review. 
Thanks [~jlowe] for suggestions, review and committing the patch.

> Failed to launch new attempts because ApplicationMasterLauncher's threads all 
> hang
> ----------------------------------------------------------------------------------
>                 Key: YARN-3809
>                 URL: https://issues.apache.org/jira/browse/YARN-3809
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>            Reporter: Jun Gong
>            Assignee: Jun Gong
>             Fix For: 2.7.1
>         Attachments: YARN-3809.01.patch, YARN-3809.02.patch, 
> YARN-3809.03.patch
> ApplicationMasterLauncher create a thread pool whose size is 10 to deal with 
> AMLauncherEventType(LAUNCH and CLEANUP).
> In our cluster, there was many NM with 10+ AM running on it, and one shut 
> down for some reason. After RM found the NM LOST, it cleaned up AMs running 
> on it. Then ApplicationMasterLauncher need handle these 10+ CLEANUP event. 
> ApplicationMasterLauncher's thread pool would be filled up, and they all hang 
> in the code containerMgrProxy.stopContainers(stopRequest) because NM was 
> down, the default RPC time out is 15 mins. It means that in 15 mins 
> ApplicationMasterLauncher could not handle new event such as LAUNCH, then new 
> attempts will fails to launch because of time out.

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