Oleksandr Shevchenko created MAPREDUCE-7136:
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Summary: TestMRAppMetrics should shutdown DefaultMetricsSystem
after completion
Key: MAPREDUCE-7136
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7136
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: test
Reporter: Oleksandr Shevchenko
Attachments: image-2018-09-10-14-39-57-992.png
TestMRAppMetrics should invoke shutdown method in DefaultMetricsSystem after
completion. Since it can lead to failing other tests. For example,
TestRMContainerAllocator#testReportedAppProgress fails when run after
TestMRAppMetrics#testNames with the following error:
{noformat}
org.apache.hadoop.metrics2.MetricsException: Metrics source MRAppMetrics
already exists!
{noformat}
!image-2018-09-10-14-39-57-992.png!
We do not catch this on the trunk since the test
TestRMContainerAllocator#testUnsupportedMapContainerRequirement run first and
"DefaultMetricsSystem.shutdown();" invokes after completion. But since JUnit
does not guarantee the order of the tests we should fix it.
Also, this is affected by previous versions which run testReportedAppProgress
first (I faced it on 2.7.0 version).
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