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From "Peter Bacsko (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-7064) Flaky test TestTaskAttempt#testReducerCustomResourceTypes
Date Mon, 12 Mar 2018 14:22:00 GMT
Peter Bacsko created MAPREDUCE-7064:
---------------------------------------

             Summary: Flaky test TestTaskAttempt#testReducerCustomResourceTypes
                 Key: MAPREDUCE-7064
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7064
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: client, test
            Reporter: Peter Bacsko
            Assignee: Peter Bacsko


The test {{TestTaskAttempt#testReducerCustomResourceType}} can occasionally fail with the
following error:

{noformat}
org.apache.hadoop.yarn.exceptions.ResourceNotFoundException: Unknown resource 'a-custom-resource'.
Known resources are [name: memory-mb, units: Mi, type: COUNTABLE, value: 0, minimum allocation:
0, maximum allocation: 9223372036854775807, name: vcores, units: , type: COUNTABLE, value:
0, minimum allocation: 0, maximum allocation: 9223372036854775807]
	at org.apache.hadoop.mapreduce.v2.app.job.impl.TestTaskAttempt.createReduceTaskAttemptImplForTest(TestTaskAttempt.java:434)
	at org.apache.hadoop.mapreduce.v2.app.job.impl.TestTaskAttempt.testReducerCustomResourceTypes(TestTaskAttempt.java:1535)
{noformat}

The root cause seems to be an interference from previous tests that start instance(s) of {{FailingAttemptsMRApp}}
or {{FailingAttemptsDuringAssignedMRApp}}. When I disabled these tests, {{testReducerCustomResourceTypes}}
always passed.



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