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https://issues.apache.org/jira/browse/HADOOP-9517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13662009#comment-13662009
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Steve Loughran commented on HADOOP-9517:
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And: {-test artifacts}:
hadoop and its sub-projects often build publish test JAR files with the suffix
{{-test}}.
These are test artifacts written for testing the Hadoop components themselves;
the publishing to a repository is merely a way of allowing later hadoop modules
to pick up the test libraries compatible with the same version of the Hadoop
public artifacts.
While any downstream project is free to use these artifacts in their own test
routines, be aware that these artifacts are considered private and unstable.
Their contents may change between any release, major or minor.
If a component in the test libraries proves to be widely reused, it may be
extracted and published as its own module -this is exactly what has been done
for the hadoop miniclusters. We can only do this if we know which classes in
the {{-test}} JARs are being used. If you find that you need to use some of our
internal-use-only classes in these libraries, please file a JIRA issue
requesting that the classes be stabilised and moved into a production library.
> Define Hadoop Compatibility
> ---------------------------
>
> Key: HADOOP-9517
> URL: https://issues.apache.org/jira/browse/HADOOP-9517
> Project: Hadoop Common
> Issue Type: Bug
> Components: documentation
> Reporter: Arun C Murthy
> Assignee: Karthik Kambatla
> Attachments: hadoop-9517.patch, hadoop-9517.patch, hadoop-9517.patch,
> hadoop-9517.patch
>
>
> As we get ready to call hadoop-2 stable we need to better define 'Hadoop
> Compatibility'.
> http://wiki.apache.org/hadoop/Compatibility is a start, let's document
> requirements clearly and completely.
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