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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2124) Add counters for measuring time spent in three different phases in reducers
Date Mon, 11 Oct 2010 18:03:32 GMT
Add counters for measuring time spent in three different phases in reducers
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                 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


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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