Yang Chen created MAPREDUCE-7359:
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Summary: Clean shared state pollution to avoid flaky test testMR
Key: MAPREDUCE-7359
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7359
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}
{code}
{{org.apache.hadoop.mapred.TestClusterMRNotification.testMR}}
h2. Why the test failed
The root cause for the failure is that this test does not clean
{{NotificationServlet.counter}} 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}
NotificationTestCase.testMR:174 expected:<2> but was:<8>{code}
{{}}
h1. Fix
Clear the value of {{NotificationServlet.counter}} at the end of the test.
Link to PR:
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