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https://issues.apache.org/jira/browse/MAPREDUCE-34?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J resolved MAPREDUCE-34.
------------------------------

    Resolution: Not A Problem

This was probably fixed. DFSClient recovery works as intended in current 
releases - stable or trunk.
                
> Reduce step hangs while recovering a block from bad datanode
> ------------------------------------------------------------
>
>                 Key: MAPREDUCE-34
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-34
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Ramya Sunil
>
> The reduce step hangs infinitely when its trying to recover a block from a 
> bad datanode. The node from which the block is being retrieved is alive and 
> TT and DN are up and running.

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