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Posted to mapreduce-issues@hadoop.apache.org by "Yang Chen (Jira)" <ji...@apache.org> on 2021/08/09 12:16:00 UTC
[jira] [Created] (MAPREDUCE-7360) Clean shared state pollution to
avoid flaky tests in class TestMRAppMaster
Yang Chen created MAPREDUCE-7360:
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Summary: Clean shared state pollution to avoid flaky tests in class TestMRAppMaster
Key: MAPREDUCE-7360
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7360
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: test
Reporter: Yang Chen
h2. What is the purpose of this change
This PR is to fix a non-idempotent test {{}}
{code:java}
org.apache.hadoop.mapreduce.v2.app.TestMRAppMaster.testMRAppMasterShutDownJob{code}
{{}}
h2. Why the test failed
The root cause for the failure is that this test does not reset FirstExitException at the end, which pollutes the shared state. It may be better to clean state pollutions so that some other tests won't fail in the future due to the shared state polluted by this test.
h2. Reproduce test failure
Run the test twice in the same JVM.
h2. Expected result
The test should pass without any failure 2 times.
h2. Actual result
Get failures:
{code:java}
[ERROR] Failures: [ERROR] TestMRAppMaster.testMRAppMasterShutDownJob:530 Expected shutDownJob to exit with status code of 0. expected:<0> but was:<1>{code}
{{}}
h2. Fix
Reset FirstExitException at the end of the test.
Link to PR:
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