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https://issues.apache.org/jira/browse/MAPREDUCE-7064?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Peter Bacsko updated MAPREDUCE-7064:
------------------------------------
    Status: Patch Available  (was: Open)

> 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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