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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4075) Reduce recommissioning overhead
Date Wed, 07 Nov 2012 10:47:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492253#comment-13492253
] 

Hudson commented on HDFS-4075:
------------------------------

Integrated in Hadoop-Yarn-trunk #29 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/29/])
    HDFS-4075. Reduce recommissioning overhead (Kihwal Lee via daryn) (Revision 1406278)

     Result = SUCCESS
daryn : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1406278
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java

                
> 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
>             Fix For: 3.0.0, 2.0.3-alpha, 0.23.5
>
>         Attachments: hdfs-4075.patch, hdfs-4075.patch, 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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