Jose Luis López created MAPREDUCE-7542:
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Summary: Shut down leaked mini-cluster instances
Key: MAPREDUCE-7542
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7542
Project: Hadoop Map/Reduce
Issue Type: Test
Components: test
Reporter: Jose Luis López
Part of the mini-cluster leak scan recorded in HDFS-17957, I came across with
two leaks in the MAPREDUCE project:
* TestNNBench#testNNBenchCrossCluster shuts its dfsCluster down only on the
happy path, so the cluster leaks exactly when the test fails.
* TestDelegationToken holds a cluster in a field with no teardown in the class
or its ancestors.
Impact: a leaked cluster keeps threads, heap and ports alive under the
remaining tests of the class, and a failure on the happy-path-only pattern can
cascade into bogus failures of later tests in the same class.
The fixes are mechanical - shutdown in a finally block, and a teardown method.
Test-scope only; no production code is touched.
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