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https://issues.apache.org/jira/browse/MAPREDUCE-479?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Douglas updated MAPREDUCE-479:
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    Status: Open  (was: Patch Available)

bq. That would be suboptimal... it's not actually a parameter in the request 
and maintaining it as a necessary side-effect requires future versions to 
preserve it.

I remain opposed to adding a string to the query to be logged on the remote 
side. If you want to make the case for _replacing_ the partition with the 
attempt ID- and extracting the partition from it on the TaskTracker side- I 
would be +0 on that approach.

> Add reduce ID to shuffle clienttrace
> ------------------------------------
>
>                 Key: MAPREDUCE-479
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-479
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 0.21.0
>            Reporter: Jiaqi Tan
>            Assignee: Jiaqi Tan
>            Priority: Minor
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-6013.patch, MAPREDUCE-479-1.patch, 
> MAPREDUCE-479-2.patch, MAPREDUCE-479-3.patch, MAPREDUCE-479.patch
>
>
> Current clienttrace messages from shuffles note only the destination map ID 
> but not the source reduce ID. Having both source and destination ID of each 
> shuffle enables full tracing of execution. 

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