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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4351) Fix BlockPlacementPolicyDefault#chooseTarget when avoiding stale nodes
Date Thu, 03 Jan 2013 16:28:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13543037#comment-13543037
] 

Hadoop QA commented on HDFS-4351:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12563083/hdfs-4351-branch-1-1.patch
  against trunk revision .

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3717//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: 1.2.0, 3.0.0
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>         Attachments: hdfs-4351-2.patch, hdfs-4351-3.patch, hdfs-4351-4.patch, hdfs-4351-branch-1-1.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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