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Date: Thu, 18 Oct 2012 23:24:03 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-4075) Reduce recommissioning overhead
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    [ https://issues.apache.org/jira/browse/HDFS-4075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13479473#comment-13479473 ] 

Hadoop QA commented on HDFS-4075:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12549762/hdfs-4075.patch
  against trunk revision .

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

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {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/3366//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3366//console

This message is automatically generated.
                
> Reduce recommissioning overhead
> -------------------------------
>
>                 Key: HDFS-4075
>                 URL: https://issues.apache.org/jira/browse/HDFS-4075
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.23.4, 2.0.2-alpha
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>         Attachments: hdfs-4075.patch
>
>
> When datanodes are recommissioned, {BlockManager#processOverReplicatedBlocksOnReCommission()} is called for each rejoined node and excess blocks are added to the invalidate list. The problem is this is done while the namesystem write lock is held.

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