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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1493) Schedulers don't recognize apps separately from app-attempts
Date Mon, 16 Dec 2013 20:17:08 GMT

    [ https://issues.apache.org/jira/browse/YARN-1493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13849676#comment-13849676
] 

Jian He commented on YARN-1493:
-------------------------------

bq. Before this, could the scheduler ever be running two attempts from the same application
at the same time?
we supposedly should not have two attempts for the same application running, YARN-1210 was
fixing this.

> Schedulers don't recognize apps separately from app-attempts
> ------------------------------------------------------------
>
>                 Key: YARN-1493
>                 URL: https://issues.apache.org/jira/browse/YARN-1493
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Jian He
>            Assignee: Jian He
>         Attachments: YARN-1493.1.patch
>
>
> Today, scheduler is tied to attempt only.
> We need to separate app-level handling logic in scheduler. We can add new app-level events
to the scheduler and separate the app-level logic out. This is good for work-preserving AM
restart, RM restart, and also needed for differentiating app-level metrics and attempt-level
metrics.



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