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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2966) TestNameNodeMetrics tests can fail under load
Date Thu, 16 Aug 2012 20:53:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13436301#comment-13436301
] 

Aaron T. Myers commented on HDFS-2966:
--------------------------------------

Hey Trevor, please open a new issue for it. Thanks a lot.
                
> 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: 2.0.0-alpha
>         Environment: OS/X running intellij IDEA, firefox, winxp in a virtualbox.
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>             Fix For: 2.2.0-alpha
>
>         Attachments: HDFS-2966.patch, 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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