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https://issues.apache.org/jira/browse/YARN-2749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14196461#comment-14196461
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Vinod Kumar Vavilapalli commented on YARN-2749:
-----------------------------------------------

Good to know this is a test only issue. But let's not try to put in sleeps like 
this, we need to make tests more deterministic, not less.

> Some testcases from TestLogAggregationService fails in trunk
> ------------------------------------------------------------
>
>                 Key: YARN-2749
>                 URL: https://issues.apache.org/jira/browse/YARN-2749
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Xuan Gong
>            Assignee: Xuan Gong
>         Attachments: YARN-2749.1.patch
>
>
> Some testcases from TestLogAggregationService fails in trunk. 
> Those can be reproduced in centos
> Stack Trace:
> java.lang.AssertionError: null
>       at org.junit.Assert.fail(Assert.java:86)
>       at org.junit.Assert.assertTrue(Assert.java:41)
>       at org.junit.Assert.assertTrue(Assert.java:52)
>       at 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.TestLogAggregationService.testLogAggregationService(TestLogAggregationService.java:1362)
>       at 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.TestLogAggregationService.testLogAggregationServiceWithRetention(TestLogAggregationService.java:1290)
> Stack Trace:
> java.lang.AssertionError: null
>       at org.junit.Assert.fail(Assert.java:86)
>       at org.junit.Assert.assertTrue(Assert.java:41)
>       at org.junit.Assert.assertTrue(Assert.java:52)
>       at 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.TestLogAggregationService.testLogAggregationService(TestLogAggregationService.java:1362)
>       at 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.TestLogAggregationService.testLogAggregationServiceWithRetention(TestLogAggregationService.java:1290)



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