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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2214) Implement a Map-Reduce application which can be used to reliably launch speculative tasks
Date Tue, 25 Mar 2008 03:03:27 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2214?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Chansler updated HADOOP-2214:
------------------------------------

    Fix Version/s:     (was: 0.17.0)

> 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 Core
>          Issue Type: Test
>          Components: mapred, 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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