Implement a Map-Reduce application which can be used to reliably launch
speculative tasks
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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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