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https://issues.apache.org/jira/browse/MAPREDUCE-7359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yang Chen updated MAPREDUCE-7359:
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Summary: Clean shared state pollution to avoid flaky tests in testCombiner
(was: Clean shared state pollution to avoid flaky test testMR)
> Clean shared state pollution to avoid flaky tests in testCombiner
> -----------------------------------------------------------------
>
> Key: MAPREDUCE-7359
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7359
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: test
> Reporter: Yang Chen
> Priority: Minor
>
> 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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