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From "Robert Kanter (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6143) add configuration for mapreduce speculative execution in MR2
Date Wed, 28 Jan 2015 23:14:36 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14296026#comment-14296026
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Robert Kanter commented on MAPREDUCE-6143:
------------------------------------------

Can you check the findbugs warnings?

One last minor thing:
- I think we should mark {{SPECULATIVE_SLOWNODE_THRESHOLD}} and {{SPECULATIVECAP}} as {{@deprecated}}.
 There doesn't seem to be a lot precedent for this, but I did see a few {{@deprecated}} configs
in {{MRJobConfig}} and {{YarnConfiguration}}, so it looks like that's the appropriate thing
to do here.


> 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
>         Attachments: MAPREDUCE-6143.000.patch, MAPREDUCE-6143.001.patch
>
>
> add configuration for  mapreduce speculative execution in MR2.
> Currently mapreduce.job.speculative.speculativecap 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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