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From "zhihai xu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-6143) add configuration for mapreduce speculative execution in MR2
Date Thu, 30 Oct 2014 04:21:34 GMT
zhihai xu created MAPREDUCE-6143:
------------------------------------

             Summary: add configuration for  mapreduce speculative execution in MR2
                 Key: MAPREDUCE-6143
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6143
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: mrv2
    Affects Versions: 2.5.1
            Reporter: zhihai xu
            Assignee: zhihai xu


add configuration for  mapreduce speculative execution in MR2.
Currently mapreduce.job.speculative.speculativecap, mapreduce.job.speculative.slowtaskthreshold
and mapreduce.job.speculative.slownodethreshold are not used for MR2 mapreduce speculative
execution any more.

We should make the following hardcode constants in DefaultSpeculator configurable for MR2
Map Reduce speculative execution:

private static final long SOONEST_RETRY_AFTER_NO_SPECULATE = 1000L * 1L;
private static final long SOONEST_RETRY_AFTER_SPECULATE = 1000L * 15L;
private static final double PROPORTION_RUNNING_TASKS_SPECULATABLE = 0.1;
private static final double PROPORTION_TOTAL_TASKS_SPECULATABLE = 0.01;
private static final int MINIMUM_ALLOWED_SPECULATIVE_TASKS = 10;



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