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https://issues.apache.org/jira/browse/HADOOP-4421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12640051#action_12640051
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Amareshwari Sriramadasu commented on HADOOP-4421:
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+1 for separate map, reduce, cleanup and setup TIPs.
Now the cleanup and setup tips occupy map/reduce slot whichever is free. I
think we should have separate slot for cleanup and setup tasks sothat they can
be launched asap.
> Rework job-setup and job-cleanup tasks
> --------------------------------------
>
> Key: HADOOP-4421
> URL: https://issues.apache.org/jira/browse/HADOOP-4421
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.19.0
> Reporter: Arun C Murthy
> Fix For: 0.20.0
>
>
> Currently we have a notion of map-{setup|cleanup} TIP and
> reduce-{setup|cleanup} TIP of which only 1 setup and cleanup tasks are picked
> by the JobInProgress. Also a lot of state-maintenence of these TIPs are done
> by the JobInProgress itself, outside of the more logical place i.e.
> TaskInProgress.
> We really should rework this to have a single setup and cleanup task which
> isn't associated with a map or reduce task i.e. into separate task _types_.
> What we have currently is quite ungainly and hard to maintain.
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