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https://issues.apache.org/jira/browse/HADOOP-5049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12666418#action_12666418
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Amar Kamat commented on HADOOP-5049:
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Owen, with 0 maps we never initialize the setup/cleanup tasks and hence there
is not setup/cleanup done for the jobs with 0 maps. So as of today jobs with 0
maps dont have any impact, right? Also we need to take care of the case where
_jip.initTasks()_ throws an exception. I think both the cases are similar. Can
we have a common/generic solution to both the problems?
> 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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