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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2124) Add job counters for measuring time spent in three different phases in reducers
Date Wed, 03 Nov 2010 05:08:32 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12927739#action_12927739
] 

Amar Kamat commented on MAPREDUCE-2124:
---------------------------------------

Scott,
If I understand correctly, you intend to display/store the amount of time spent by the reducer
during shuffle, sort and reduce phase in the task/attempt counter for completed tasks. Currently,
once the task is done, shuffle and sort times are stored in the job history (via {{TaskStatus}}).
Why can't you simply use this, instead of counters, to display shuffle and sort times for
reducers on the webui (and store it in {{TaskReport}})?

> Add job counters for measuring time spent in three different phases in reducers
> -------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2124
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2124
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobtracker
>    Affects Versions: 0.22.0
>            Reporter: Scott Chen
>            Assignee: Scott Chen
>            Priority: Minor
>             Fix For: 0.22.0
>
>         Attachments: MAPREDUCE-2124-v2.txt, MAPREDUCE-2124.txt, test-result.txt
>
>
> We currently have SLOTS_MILLIS_REDUCES which measures the total slot time of reducer.
> It will be useful if we have
> {code}
> SLOTS_MILLIS_REDUCES_COPY
> SLOTS_MILLIS_REDUCES_SORT
> SLOTS_MILLIS_REDUCES_REDUCE
> {code}
> which measures three different phases of a reducer.
> This will help us identify the bottleneck of the reducers.

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