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Date: Sat, 25 Feb 2012 01:31:49 +0000 (UTC)
From: "Hadoop QA (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HDFS-2966) TestNameNodeMetrics tests can fail
 under load
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    [ https://issues.apache.org/jira/browse/HDFS-2966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13216223#comment-13216223 ] 

Hadoop QA commented on HDFS-2966:
---------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12516000/HDFS-2966.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit warnings.

    +1 core tests.  The patch passed unit tests in .

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/1910//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/1910//console

This message is automatically generated.
                
> TestNameNodeMetrics tests can fail under load
> ---------------------------------------------
>
>                 Key: HDFS-2966
>                 URL: https://issues.apache.org/jira/browse/HDFS-2966
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 0.24.0
>         Environment: OS/X running intellij IDEA, firefox, winxp in a virtualbox.
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>             Fix For: 0.24.0, 0.23.2
>
>         Attachments: HDFS-2966.patch, HDFS-2966.patch, HDFS-2966.patch
>
>
> I've managed to recreate HDFS-540 and HDFS-2434 by the simple technique of running the HDFS tests on a desktop with out enough memory for all the programs trying to run. Things got swapped out and the tests failed as the DN heartbeats didn't come in on time.
> the tests both rely on {{waitForDeletion()}} to block the tests until the delete operation has completed, but all it does is sleep for the same number of seconds as there are datanodes. This is too brittle -it may work on a lightly-loaded system, but not on a system under heavy load where it is taking longer to replicate than expect.
> Immediate fix: double, triple, the sleep time?
> Better fix: have the thread block until all the DN heartbeats have finished.

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