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Posted to mapreduce-issues@hadoop.apache.org by "Zhengxi Li (Jira)" <ji...@apache.org> on 2020/11/29 23:12:00 UTC
[jira] [Created] (MAPREDUCE-7310) Fix flaky test
TestJobHistoryEventHandler.testSigTermedFunctionality
Zhengxi Li created MAPREDUCE-7310:
-------------------------------------
Summary: Fix flaky test TestJobHistoryEventHandler.testSigTermedFunctionality
Key: MAPREDUCE-7310
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7310
Project: Hadoop Map/Reduce
Issue Type: Bug
Reporter: Zhengxi Li
The test '{{org.apache.hadoop.mapreduce.jobhistory.TestJobHistoryEventHandler.testSigTermedFunctionality'}} is not idempotent and fails if run twice in the same JVM, because it pollutes state shared among tests. It may be good to clean this state pollution so that some other tests do not fail in the future due to the shared state polluted by this test.
h3. Details
Running `TestJobHistoryEventHandler.testSigTermedFunctionality` twice would result in the second run failing due to `NullPointerException`shown in the following:
{noformat}
java.lang.NullPointerException
at org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler.serviceStop(JobHistoryEventHandler.java:460)
at org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
at org.apache.hadoop.mapreduce.jobhistory.TestJobHistoryEventHandler.testSigTermedFunctionality(TestJobHistoryEventHandler.java:933)
{noformat}
The root cause of this is that running '{{TestJobHistoryEventHandler.testSigTermedFunctionality'}} results in some entries to be added to the static '{{JobHistoryEventHandler.fileMap'}}. The entries in the '{{fileMap'}} are not cleaned up when the test is done, resulting in a NullPointerException in the second run as the stale object(added in the first run) in the 'fileMap' is accessed.
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