[jira] [Created] (MAPREDUCE-7359) Clean shared state pollution to avoid flaky test testMR

["Yang Chen (Jira)" <ji...@apache.org>]

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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