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From Dan Filimon <>
Subject Re: Presentation on Hadoop Testing at the Chicago HUG
Date Tue, 20 Nov 2012 18:44:03 GMT
Great work! :)

Just one question – on the slide about the limitation of MRUnit, you
mentioned "multiple lines of input for a mapper".
Are you referring to having a mapper that can get multiple key-value pairs?
If so, this has been fixed in trunk and the corresponding JIRA issue is [1].


On Tue, Nov 20, 2012 at 7:27 PM, Tom Wheeler <> wrote:
> I gave a talk [1] about testing MapReduce code at the Chicago Hadoop
> User Group meeting last Monday night.  This was a shorter, and more
> developer focused of a session I did a month ago at Strata + Hadoop
> World in NYC.  Although I discuss a few testing techniques, I covered
> MRUnit pretty extensively and thought it might therefore be of
> interest to some here.
> There were several demos and the source code to those is also
> available [2]. The README.txt in the root of the ZIP file should give
> a reasonable overview of what each demo does.
> It seems that MRUNIT-53 (Create Tutorial and Guide) is still open and
> work on it appears stalled.  If there's interest, I'd be happy to  use
> the code and explanations from my talk to develop a more comprehensive
> tutorial for the site.
> Tom Wheeler
> [1]
> [2]

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