[jira] Updated: (HADOOP-5518) MRUnit unit test library

["Aaron Kimball (JIRA)" <ji...@apache.org>]

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

Aaron Kimball updated HADOOP-5518:
----------------------------------

    Attachment: mrunit.patch
                overview.html

Initial upload of MRUnit source

> MRUnit unit test library
> ------------------------
>
>                 Key: HADOOP-5518
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5518
>             Project: Hadoop Core
>          Issue Type: New Feature
>            Reporter: Aaron Kimball
>         Attachments: 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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