[jira] [Commented] (YARN-2487) Need to support timeout of AM When no containers are assigned to it for a defined period

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-2487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14118228#comment-14118228 ] 

Steve Loughran commented on YARN-2487:
--------------------------------------

link to YARN-624; gang scheduling problem

> Need to support timeout of AM When no containers are assigned to it for a defined period
> ----------------------------------------------------------------------------------------
>
>                 Key: YARN-2487
>                 URL: https://issues.apache.org/jira/browse/YARN-2487
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>            Reporter: Naganarasimha G R
>            Assignee: Naganarasimha G R
>
>  There are some scenarios where AM will not get containers and indefinitely waiting. We faced one such sceanrio which makes the applications to get hung : 
> Consider a cluster setup which has 2 NMS of each 8GB resource,
> And 2 applications(MR2) are launched in the default queue where in each AM is taking 2 GB each.
> Each AM is placed in each of the NM. Now each AM is requesting for container of 7Gb  mem resource .
> As in each NM only 6GB resource is available both the applications are hung forever.
> To avoid such scenarios i would like to propose 
> generic timeout feature for all AM's in yarn, such that if no containers are assigned for an application for a defined period than yarn can timeout the application attempt.
> Default can be set to 0 where in RM will not timeout the app attempt and user can set his own timeout when he submits the application



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