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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15614) TestGroupsCaching.testExceptionOnBackgroundRefreshHandled reliably fails
Date Tue, 17 Jul 2018 17:32:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16546917#comment-16546917
] 

Jason Lowe commented on HADOOP-15614:
-------------------------------------

It fails reliably when run in isolation on this line:
{noformat}
    assertEquals(startingRequestCount, FakeGroupMapping.getRequestCount());
{noformat}

but it also sporadically fails on this last code line below when run with the other tests:
{noformat}
    // Now sleep for a short time and re-check the request count. It should have
    // increased, but the exception means the cache will not have updated
    Thread.sleep(50);
    FakeGroupMapping.setThrowException(false);
    assertEquals(startingRequestCount + 1, FakeGroupMapping.getRequestCount());
    assertEquals(groups.getGroups("me").size(), 2);
{noformat}

The 50msec sleep screams racy test to me.


> TestGroupsCaching.testExceptionOnBackgroundRefreshHandled reliably fails
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-15614
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15614
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>            Priority: Major
>
> When {{testExceptionOnBackgroundRefreshHandled}} is run individually, it reliably fails.
It seems like a fundamental bug in the test or groups caching.
> A similar issue was dealt with in HADOOP-13375. [~cheersyang], do you have any insight
into this?
> This test case was added in HADOOP-13263.



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