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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4421) Rework job-setup and job-cleanup tasks
Date Wed, 15 Oct 2008 22:18:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12639991#action_12639991
] 

Arun C Murthy commented on HADOOP-4421:
---------------------------------------

I propose we bite the bullet and introduce an enum TaskType {MAP, REDUCE, SETUP, CLEANUP}
while we fix this... 

> 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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