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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13375) o.a.h.security.TestGroupsCaching.testBackgroundRefreshCounters seems flaky
Date Thu, 01 Sep 2016 08:56:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15454814#comment-15454814

Weiwei Yang commented on HADOOP-13375:

Hello [~liuml07]

Sorry I missed your 1st comment :( earlier. Regarding to your concern, it doesn't bother me
too much because

* The only method used in multiple threads is {{latch.await()}}, this doesn't change latch's
* {{FakeGroupMapping.resume()}} changes the state but it is only called in main thread. 

So I don't think there will be any thread safety issues.  I agree to add {{volatile}} that
makes sense, so I added it in v7 patch so I am good for either ways. Appreciate your thoroughly

> o.a.h.security.TestGroupsCaching.testBackgroundRefreshCounters seems flaky
> --------------------------------------------------------------------------
>                 Key: HADOOP-13375
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13375
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security, test
>    Affects Versions: 2.8.0
>            Reporter: Mingliang Liu
>            Assignee: Weiwei Yang
>         Attachments: HADOOP-13375.001.patch, HADOOP-13375.002.patch, HADOOP-13375.003.patch,
HADOOP-13375.004.patch, HADOOP-13375.005.patch, HADOOP-13375.006.patch, HADOOP-13375.007.patch
> h5. Error Message
> bq. expected:<1> but was:<0>
> h5. Stacktrace
> {quote}
> java.lang.AssertionError: expected:<1> but was:<0>
> 	at org.junit.Assert.fail(Assert.java:88)
> 	at org.junit.Assert.failNotEquals(Assert.java:743)
> 	at org.junit.Assert.assertEquals(Assert.java:118)
> 	at org.junit.Assert.assertEquals(Assert.java:555)
> 	at org.junit.Assert.assertEquals(Assert.java:542)
> 	at org.apache.hadoop.security.TestGroupsCaching.testBackgroundRefreshCounters(TestGroupsCaching.java:638)
> {quote}

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