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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4351) Fix BlockPlacementPolicyDefault#chooseTarget when avoiding stale nodes
Date Wed, 02 Jan 2013 23:26:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13542543#comment-13542543

Hadoop QA commented on HDFS-4351:

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-hdfs-project/hadoop-hdfs.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/3711//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3711//console

This message is automatically generated.
> Fix BlockPlacementPolicyDefault#chooseTarget when avoiding stale nodes
> ----------------------------------------------------------------------
>                 Key: HDFS-4351
>                 URL: https://issues.apache.org/jira/browse/HDFS-4351
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 3.0.0
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>         Attachments: hdfs-4351-2.patch, hdfs-4351-3.patch, hdfs-4351-4.patch, hdfs-4351.patch
> There's a bug in {{BlockPlacementPolicyDefault#chooseTarget}} with stale node avoidance
enabled (HDFS-3912). If a NotEnoughReplicasException is thrown in the call to {{chooseRandom()}},
{{numOfReplicas}} is not updated together with the partial result in {{result}} since it is
pass by value. The retry call to {{chooseTarget}} then uses this incorrect value.
> This can be seen if you enable stale node detection for {{TestReplicationPolicy#testChooseTargetWithMoreThanAvaiableNodes()}}.

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