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https://issues.apache.org/jira/browse/HADOOP-4902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14068853#comment-14068853
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Allen Wittenauer commented on HADOOP-4902:
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Fairly certain this has been fixed, but I'll let one of y'all verify it.
> Support for a per-class cluster in ClusterMapReduceTestCase
> -----------------------------------------------------------
>
> Key: HADOOP-4902
> URL: https://issues.apache.org/jira/browse/HADOOP-4902
> Project: Hadoop Common
> Issue Type: Improvement
> Components: test
> Reporter: Tom White
> Assignee: Alex Loddengaard
>
> ClusterMapReduceTestCase currently creates a new mini cluster for each test
> case. For many tests this is unnecessary overhead as the test cases could run
> against the same cluster, one after another, without risking correctness. As
> a part of this issue we should change tests that subclass
> ClusterMapReduceTestCase to use a per-test cluster where appropriate.
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