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https://issues.apache.org/jira/browse/MAPREDUCE-379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13812241#comment-13812241
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Augusto Souza commented on MAPREDUCE-379:
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Hello, is this still relevant? I would like to help with it, can someone point
me to a starting point?
> Implement a Map-Reduce application which can be used to reliably launch
> speculative tasks
> -----------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-379
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-379
> Project: Hadoop Map/Reduce
> Issue Type: Test
> Reporter: Arun C Murthy
>
> 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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