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https://issues.apache.org/jira/browse/HADOOP-4901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12716277#action_12716277
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Steve Loughran commented on HADOOP-4901:
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a lot of the tests are a bit weak on releasing the miniMR clusters on failure.
As long as everything works, nobody notices, but when a test fails, the
clusters hang around.
It's that cluster setup/teardown that causes a lot of the tests to be slow -if
teardown could be asynchronous, maybe even with queued creation of
MiniMRClusters, things could be faster.
> Upgrade to JUnit 4
> ------------------
>
> Key: HADOOP-4901
> URL: https://issues.apache.org/jira/browse/HADOOP-4901
> Project: Hadoop Core
> Issue Type: Improvement
> Components: test
> Reporter: Tom White
> Assignee: Alex Loddengaard
>
> Amongst other things, JUnit 4 has better support for class-wide set up and
> tear down (via @BeforeClass and @AfterClass annotations), and more flexible
> assertions (http://junit.sourceforge.net/doc/ReleaseNotes4.4.html). It would
> be nice to be able to take advantage of these features in tests we write.
> JUnit 4 can run tests written for JUnit 3.8.1 without any changes.
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