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https://issues.apache.org/jira/browse/MAPREDUCE-798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12734804#action_12734804
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Aaron Kimball commented on MAPREDUCE-798:
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According to the comments in the ChainMapper source, it allows you to run jobs
of the form {{M+RM*}}. This is designed to test pipelines of the form
{{(MR)+}}. Can you elaborate a bit more on how you think ChainMapper /
ChainReducer fits here?
> MRUnit should be able to test a succession of MapReduce passes
> --------------------------------------------------------------
>
> Key: MAPREDUCE-798
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-798
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Reporter: Aaron Kimball
> Assignee: Aaron Kimball
> Attachments: MAPREDUCE-798.patch
>
>
> MRUnit can currently test that the inputs to a given (mapper, reducer) "job"
> produce certain outputs at the end of the reducer. It would be good to
> support more end-to-end tests of a series of MapReduce jobs that form a
> longer pipeline surrounding some data.
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