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https://issues.apache.org/jira/browse/MAPREDUCE-7542?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cheng Pan updated MAPREDUCE-7542:
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Fix Version/s: 3.6.0
> 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
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.6.0
>
> Original Estimate: 8h
> Remaining Estimate: 8h
>
> 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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