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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4278) TestDatanodeDeath failed occasionally
Date Wed, 15 Oct 2008 18:30:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12639923#action_12639923

dhruba borthakur commented on HADOOP-4278:

@Sameer: I agree that out test is triggering a known issue that is more likely to occur when
the Blockreceiver thread dies but the PacketResponder thread is still able to communicate
a response to the upstream datanode (or client). This case typically does not occur in real
life, because when a datanode dies all its threads cannot communicate with other datanodes
in the pipeline. I am saying that this is not likely to be a blocker for 0.19; but on the
other hand, if it is occuring frequently whiel running unit tests it is better to fix it quickly.
I am thinking of changing the way the unit test kills a datanode. BTW, do you ever see this
scenario being triggered in real-life cases, e.g. GridMix and or perforamance benchmarks?

@Raghu: I was thinking that both this one and HADOOP-3416 is refers to the fact that the method
employed by the unit test to kill datanodes is not very deterministic and that is the reason
why this JIRA is related to 3416. Fixing one issue probably fixes the other one too. Let me
do some investigation on how to fix it.

> TestDatanodeDeath failed occasionally
> -------------------------------------
>                 Key: HADOOP-4278
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4278
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: dhruba borthakur
>            Priority: Blocker
>             Fix For: 0.19.0
> TestDatanodeDeath keeps failing occasionally.  For example, see
> http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3365/testReport/

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