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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5518) MRUnit unit test library
Date Tue, 29 Sep 2009 19:35:07 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5518?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Robert Chansler updated HADOOP-5518:

    Release Note: New contribution MRUnit helps authors of map-reduce programs write unit
tests with JUnit.  (was: MRUnit is a tool to help authors of MapReduce programs write unit
tests. It allows easy testing of Mapper and Reducer implementations using JUnit.)

Editorial pass over all release notes prior to publication of 0.21.

> MRUnit unit test library
> ------------------------
>                 Key: HADOOP-5518
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5518
>             Project: Hadoop Common
>          Issue Type: New Feature
>            Reporter: Aaron Kimball
>            Assignee: Aaron Kimball
>             Fix For: 0.21.0
>         Attachments: HADOOP-5518-2.patch, HADOOP-5518-3.patch, HADOOP-5518-branch18.patch,
mrunit.patch, overview.html
> MRUnit is a tool to help authors of MapReduce programs write unit tests.
> Testing map() and reduce() methods requires some repeated work to mock the inputs and
outputs of a Mapper or Reducer class, and ensure that the correct values are emitted to the
OutputCollector based on inputs. Also, testing a mapper and reducer together requires running
them with the sorted ordering guarantees made by the shuffle process.
> This library provides the above functionality to authors of maps and reduces; it allows
you to test maps, reduces, and map-reduce pairs without needing to perform all the setup and
teardown work associated with running a job.
> I believe this tool may be useful to the broader Hadoop community, so I have cleaned
it up and would like to see it become a "contrib" module. My current environment is based
on Hadoop 0.18, so this is the format it expects to use. It does not have support for the
new Context-based interfaces for mappers/reducers.
> I have attached the overview.html file for its javadoc, which provides more synopsis
and an example of usage; I am also providing the current source code so that you can evaluate
its structure.
> Ideally with some feedback from the community this will move toward supporting the current
trunk interface soon.
> This currently works with JUnit 4; the supplied patch changes Ivy's libraries.properties
file to use JUnit 4.5. I'm marking HADOOP-4901 as a dependency for this reason.

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