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https://issues.apache.org/jira/browse/MAPREDUCE-482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13410034#comment-13410034
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Harsh J commented on MAPREDUCE-482:
-----------------------------------

I wonder if this makes sense to do in the ShuffleHandler today in MR2, or if it 
is already done. It would fit in with the event/transition model used in other 
places and does sound like a good idea.
                
> Each shuffle should proceed as a DFA
> ------------------------------------
>
>                 Key: MAPREDUCE-482
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-482
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Devaraj Das
>            Priority: Minor
>
> The shuffle code (for fetching map outputs) should proceed as a DFA. The 
> states (as Owen had mentioned on HADOOP-1183) are (INITIAL, LOCATED, 
> FETCHING, DONE, FAILED). This is to ensure correctness of map output fetching.

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