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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3809) Failed to launch new attempts because ApplicationMasterLauncher's threads all hang
Date Wed, 17 Jun 2015 23:34:01 GMT

    [ https://issues.apache.org/jira/browse/YARN-3809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14590849#comment-14590849
] 

Karthik Kambatla commented on YARN-3809:
----------------------------------------

Shouldn't the number of threads in the pool be at least as big as the maximum number of apps
that could run on a node? By making it configurable, how do we expect the admins to pick this
number? Just pick an arbitrarily high value? 

> 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: Improvement
>          Components: resourcemanager
>            Reporter: Jun Gong
>            Assignee: Jun Gong
>         Attachments: YARN-3809.01.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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