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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5049) Jobs with 0 maps will never get removed from the default scheduler
Date Fri, 23 Jan 2009 00:43:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12666371#action_12666371

Owen O'Malley commented on HADOOP-5049:

I agree with Vivek. I think that changing the state of the job should always generate the
jobUpdated method.

That said, I think that we should not short-circuit maps with 0 jobs. Especially, now that
we have job initialization and clean up, it isn't the case that jobs with maps = 0 will have
no impact.

> Jobs with 0 maps will never get removed from the default scheduler
> ------------------------------------------------------------------
>                 Key: HADOOP-5049
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5049
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Amar Kamat
>            Assignee: Amar Kamat
>            Priority: Blocker
>             Fix For: 0.20.0
>         Attachments: HADOOP-5049-v1.1.patch
> Jobs' with 0 maps finish/succeed in the init phase i.e while the job is in the _PREP_
state. {{EagerTaskInitializationListener}} removes the job after initing but {{JobQueueJobInProgressListener}}
waits for a job-state change event to be raised and aonly then removes the job from the queue
and hence the job will stay forever with the {{JobQueueJobInProgressListener}}. Looks like
{{FairScheduler}} periodically scans the job list and removes completed jobs. {{CapacityScheduler}}
has a concept of waiting jobs and scans waiting queue for completed jobs and purges them.

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