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https://issues.apache.org/jira/browse/MAPREDUCE-5234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13657704#comment-13657704
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Karthik Kambatla commented on MAPREDUCE-5234:
---------------------------------------------

In cases where hadoop-1 and hadoop-0.23 are incompatible, in the long term, it 
might be better to break the one with fewer users. It is kind of unfortunate, 
but seems like the lesser of the two evils.
                
> Signature changes for getTaskId of TaskReport in mapred
> -------------------------------------------------------
>
>                 Key: MAPREDUCE-5234
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5234
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>            Reporter: Zhijie Shen
>            Assignee: Mayank Bansal
>         Attachments: MAPREDUCE-5234-trunk-1.patch
>
>
> TaskReport in mapred of MR2 extends TaskReport in mapreduce, and inherits 
> getTaskId, which return TaskID object. in MR1, this function returns String.

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