MiniMRCluster should have an idempotent shutdown
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Key: HADOOP-3843
URL: https://issues.apache.org/jira/browse/HADOOP-3843
Project: Hadoop Core
Issue Type: Bug
Reporter: Steve Loughran
It looks on a quick skim-through that the
org.apache.hadoop.mapred.MiniMRCluster class has nothing to stop a caller
calling shutdown() more than once, with possible adverse consequences. This
will normally only show up if a test fails at precisely the wrong place.
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