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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3856) fork failure running hdfs unit tests trunk and branch-2
Date Mon, 27 Aug 2012 15:34:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13442470#comment-13442470
] 

Kihwal Lee commented on HDFS-3856:
----------------------------------

I've run into this problem before where a test is exiting prematurely, causing surefire to
report a fork failure. This is not really the failure of fork() system call. We get this when
a forked test process exits before the test harness has a chance to do it. For example, the
following will generate a fork failure.

{code}
  @Test
  public void TestBlowUp() throws InterruptedException {
    Thread.sleep(3000);
    System.exit(-1);

  }
{code}

If the exit code is set to zero in the above example, surefile will still error out, but it
won't be a fork failure.  On a related note, I have recently seen the MiniDFSCluster reporting
an exit exception in multiple test cases. 
                
> fork failure running hdfs unit tests trunk and branch-2
> -------------------------------------------------------
>
>                 Key: HDFS-3856
>                 URL: https://issues.apache.org/jira/browse/HDFS-3856
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 3.0.0, 2.2.0-alpha
>            Reporter: Thomas Graves
>            Priority: Blocker
>
> We have been seeing the hdfs tests on trunk and branch-2 error out with fork failures.
 I see the hadoop jenkins trunk build is also seeing these:
> https://builds.apache.org/view/Hadoop/job/Hadoop-trunk/lastCompletedBuild/console

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