Yang Chen created MAPREDUCE-7357:
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Summary: Clean shared state pollution to avoid flaky tests in
class TestAppController
Key: MAPREDUCE-7357
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7357
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: test
Reporter: Yang Chen
h2. What is the purpose of this change
This issue is to fix a non-idempotent test
{code:java}
org.apache.hadoop.mapreduce.v2.app.webapp.TestAppController.testAttempt{code}
h2. Why the test failed
The root cause for the failure is that this test does not remove the value of
key AMParams.ATTEMPT_STATE, 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 failures for 2 times.
h2. Actual result
Get failures:
{code:java}
[ERROR] Failures:
[ERROR] TestAppController.testAttempts:315 expected:<[Bad request:
missing attempt-state.]> but was:<[State MAP attempts in job_01_01]>{code}
h2. Fix
Remove this key-value pair by
{code:java}
appController.getProperty().remove(AMParams.ATTEMPT_STATE){code}
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