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https://issues.apache.org/jira/browse/HDFS-8824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14698295#comment-14698295
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Hudson commented on HDFS-8824:
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FAILURE: Integrated in Hadoop-Hdfs-trunk-Java8 #277 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk-Java8/277/])
HDFS-8824. Do not use small blocks for balancing the cluster. (szetszwo: rev
2bc0a4f299fbd8035e29f62ce9cd22e209a62805)
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Dispatcher.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/balancer/TestBalancer.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java
> Do not use small blocks for balancing the cluster
> -------------------------------------------------
>
> Key: HDFS-8824
> URL: https://issues.apache.org/jira/browse/HDFS-8824
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: balancer & mover
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Fix For: 2.8.0
>
> Attachments: h8824_20150727b.patch, h8824_20150811b.patch
>
>
> Balancer gets datanode block lists from NN and then move the blocks in order
> to balance the cluster. It should not use the blocks with small size since
> moving the small blocks generates a lot of overhead and the small blocks do
> not help balancing the cluster much.
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