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https://issues.apache.org/jira/browse/MAPREDUCE-6143?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhihai xu updated MAPREDUCE-6143:
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Attachment: MAPREDUCE-6143.001.patch
> 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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