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From "Dick King (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2037) Capturing interim progress times, CPU usage, and memory usage, when tasks reach certain progress thresholds
Date Fri, 27 Aug 2010 21:05:54 GMT
Capturing interim progress times, CPU usage, and memory usage, when tasks reach certain progress
thresholds
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                 Key: MAPREDUCE-2037
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2037
             Project: Hadoop Map/Reduce
          Issue Type: New Feature
            Reporter: Dick King
            Assignee: Dick King
             Fix For: 0.22.0


We would like to capture the following information at certain progress thresholds as a task
runs:

   * Time taken so far
   * CPU load [either at the time the data are taken, or exponentially smoothed]
   * Memory load [also either at the time the data are taken, or exponentially smoothed]

This would be taken at intervals that depend on the task progress plateaus.  For example,
reducers have three progress ranges -- [0-1/3], (1/3-2/3], and (2/3-3/3] -- where fundamentally
different activities happen.  Mappers have different boundaries, I understand, that are not
symmetrically placed.  Data capture boundaries should coincide with activity boundaries. 
For the state information capture [CPU and memory] we should average over the covered interval.

This data would flow in with the heartbeats.  It would be placed in the job history as part
of the task attempt completion event, so it could be processed by rumen or some similar tool
and could drive a benchmark engine.

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