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https://issues.apache.org/jira/browse/MAPREDUCE-5234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13657672#comment-13657672
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Zhijie Shen commented on MAPREDUCE-5234:
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Vinod, I think unfortunately we need to change mapreduce.TaskReport, where 
TaskID getTaskId() gets inherited by mapred.TaskReport. However, in MR1, 
getTaskId() returns String. The return type cannot be overloaded. Like 
MAPREDUCE-5156, we have to choose one to break, either MR1 or early MR2 
versions.
                
> 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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