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https://issues.apache.org/jira/browse/MAPREDUCE-7064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16395520#comment-16395520
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Peter Bacsko commented on MAPREDUCE-7064:
-----------------------------------------
[~jlowe] [~haibochen] could you guys please review this patch? After these
changes, the test no longer fails. The test failure is consistently
reproducible on my machine without it.
> 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
> Priority: Major
> Attachments: MAPREDUCE-7064-001.patch
>
>
> 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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