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https://issues.apache.org/jira/browse/HDFS-4075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492314#comment-13492314
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Hudson commented on HDFS-4075:
------------------------------
Integrated in Hadoop-Hdfs-trunk #1219 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1219/])
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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