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https://issues.apache.org/jira/browse/MAPREDUCE-725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728532#action_12728532
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Vinod K V commented on MAPREDUCE-725:
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bq. the number of speculative tasks is very dynamic(depends on progress of
other tasks, overall job progress etc.).
Not just that, as we've found out while working on MAPREDUCE-722, speculative
tasks is also dependant on the TaskTracker in question - for e.g. a task can
have a speculative attempt w.r.t one TT and none w.r.t another if it has
already run on the later TT.
> CapacityScheduler.TaskSchedulingMgr.hasSpeculativeTask bypasses HADOOP-2141
> ---------------------------------------------------------------------------
>
> Key: MAPREDUCE-725
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-725
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: contrib/capacity-sched
> Reporter: Arun C Murthy
> Priority: Critical
>
> CapacityScheduler.TaskSchedulingMgr.hasSpeculativeTask has a duplicate of the
> old speculation code (pre HADOOP-2141) which needs to be fixed in-order for
> speculation to work correctly.
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