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https://issues.apache.org/jira/browse/YARN-1493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13849629#comment-13849629
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Jian He commented on YARN-1493:
-------------------------------
New patch changes:
- Make schedulers send the App_accepted/App_rejected event to the RMApp instead
of RMAppAttempt.
- Create two new events AppAddedSchedulerEvent and AppRemovedSchedulerEvent for
adding and removing apps in the schedulers.
- Change the state transition to start a new attempt until the app is accepted
by the scheduler.
- Create a new SchedulerApplicationWrapper (will rename this to
SchedulerApplication, and rename the current SchedulerApplication to
SchedulerApplicationAttempt ). This object is created and kept in scheduler
when scheduler receive the Add_App event from RMApp and removed when receive
the Remove_app event.
> 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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