[jira] Commented: (HADOOP-4053) Schedulers need to know when a job has completed

["Vivek Ratan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-4053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12627573#action_12627573 ] 

Vivek Ratan commented on HADOOP-4053:
-------------------------------------

A job is marked complete in JobTracker.finalizeJob(). At this point, a JobInProgressListener listener should be notified of this change. I can see at least two options to do this: 
1. Call JobInProgressListener.jobUpdated() at this point. Ideally, this method should include two arguments/objects: one capturing the old state and one the new state, otherwise the listener has to figure out how the job has been updated. 
2. Add a new method to JobInProgressListener called jobCompleted(), and call that from finalizeJob(). 

The second is cleaner, IMO, as a job's completion is a distinct, well understood event in the system. 

> Schedulers need to know when a job has completed
> ------------------------------------------------
>
>                 Key: HADOOP-4053
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4053
>             Project: Hadoop Core
>          Issue Type: Improvement
>            Reporter: Vivek Ratan
>
> The JobInProgressListener interface is used by the framework to notify Schedulers of when jobs are added, removed, or updated. Right now, there is no way for the Scheduler to know that a job has completed. jobRemoved() is called when a job is retired, which can happen many hours after a job is actually completed. jobUpdated() is called when a job's priority is changed. We need to notify a listener when a job has completed (either successfully, or has failed or been killed). 

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