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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4053) Schedulers need to know when a job has completed
Date Thu, 25 Sep 2008 11:53:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12634452#action_12634452
] 

Hemanth Yamijala commented on HADOOP-4053:
------------------------------------------

bq. 1. I'd expect jobCompleted() to be a no-op, and have jobRemoved() get called when the
job is removed.

I can only speak from the {{CapacityTaskScheduler}}'s perspective. It cares about jobCompleted,
and doesn't care about jobRemoved. Actually, I would have thought jobCompleted is the more
important event for a scheduler. While the number of implementations is still small (only
four right now), I would still advocate an abstract method and leave the schedulers to actually
deal with the implementation.

> 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
>    Affects Versions: 0.19.0
>            Reporter: Vivek Ratan
>            Assignee: Amar Kamat
>             Fix For: 0.19.0
>
>         Attachments: HADOOP-4053-v1.patch
>
>
> 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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