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From "Ranjit Mathew (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2105) Simulate Load Incrementally and Adaptively in GridMix3
Date Mon, 04 Oct 2010 11:28:32 GMT
Simulate Load Incrementally and Adaptively in GridMix3
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                 Key: MAPREDUCE-2105
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2105
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: contrib/gridmix
    Affects Versions: 0.22.0
            Reporter: Ranjit Mathew


Tasks launched by GridMix3 should incrementally and adaptively simulate load (I/O, CPU, memory,
etc.) rather than doing
everything upfront and then sleeping. This helps in evening out the load when fine-grained
information from the original
Task is not available and greater accuracy when it is.

By "incremental" I mean having several iterations corresponding to appropriate phases/time-slices.
By "adaptive" I mean
taking the existing load into account before inflicting additional load to meet a target load
(we are unlikely to achieve
100% fidelity as we overshoot or undershoot with each iteration).

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