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https://issues.apache.org/jira/browse/HADOOP-2214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12543141
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Doug Cutting commented on HADOOP-2214:
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+1 This would be great to have. It would be nice to have a simple version that
runs in tens of seconds that could be run as a unit test too.
> Implement a Map-Reduce application which can be used to reliably launch
> speculative tasks
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-2214
> URL: https://issues.apache.org/jira/browse/HADOOP-2214
> Project: Hadoop
> Issue Type: Test
> Components: test
> Reporter: Arun C Murthy
> Fix For: 0.16.0
>
>
> It would be very useful to have a reliable test case to help launch
> speculative tasks (maps and/or reduces) to help debug problems or fine-tune
> strategies for speculative execution.
> I propose we implement some along the lines of the SmallJobsBenchmark and put
> it in the hadoop-test.jar. I imagine it could be used like:
> {noformat}
> $ bin/hadoop jar hadoop-${version}-test.jar speculativejob -nMaps 1000
> -nReduces 50 -specMaps 10 -specReduces 5
> {noformat}
> The application should be minutely aware of the _current_ strategies for
> launching speculative tasks, and throttle requisite no. of maps/reduces to
> ensure that the speculative tasks are launched in a reliable and repeatable
> manner.
> Thoughts?
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