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https://issues.apache.org/jira/browse/HDFS-2415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13154107#comment-13154107
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Steve Loughran commented on HDFS-2415:
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# if the test jar includes log4j.properties it causes problems downstream
# putting it in the main jar formalises its existence as a stable tool for
external use. Which I think it should be, though you may disagree.
The key point is that these mini clusters are ideal for downstream testing, as
well as in-Hadoop.
> Move MiniDFS out of test JAR and into the main hadoop-hdfs JAR
> --------------------------------------------------------------
>
> Key: HDFS-2415
> URL: https://issues.apache.org/jira/browse/HDFS-2415
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: test
> Reporter: Steve Loughran
> Priority: Minor
>
> This is just an idea: move the MiniDFS cluster out of the Hadoop test JAR and
> into the main redistributable.
> This would make it easier for people downstream to use it. It is the easiest
> way to bring up a DFS cluster in a single JVM, and with the MiniMR cluster is
> a common way to test MR jobs in the IDE against small datasets.
> Moving the file while keeping the package name should not cause any problems;
> all it will do is make applying outstanding patches to it slightly harder.
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