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https://issues.apache.org/jira/browse/MAPREDUCE-6440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14699739#comment-14699739
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zhihai xu commented on MAPREDUCE-6440:
--------------------------------------

It looks like app master web service url 
http://<am_ip>:<am_port>/ws/v1/mapreduce/jobs/{jobid}/tasks/{taskid}/attempts 
also has this issue. Yes, it will be an incompatible change to fix this issue. 
it will be better to fix it at 3.0.0.

> Duplicate Key in Json Output for Job details
> --------------------------------------------
>
>                 Key: MAPREDUCE-6440
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6440
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobhistoryserver
>            Reporter: Anushri
>            Assignee: Bibin A Chundatt
>            Priority: Minor
>
> Duplicate key in Json Output for Job details for the url : 
> http://<jhs_ip>:<jhs_port>/ws/v1/history/mapreduce/jobs/job_id/tasks/task_id/attempts
> If the task type is "REDUCE" the json output for this url contains duplicate 
> key for "type".



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