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https://issues.apache.org/jira/browse/HDFS-11742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16096326#comment-16096326
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Hudson commented on HDFS-11742:
-------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #12043 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/12043/])
HDFS-11742. Improve balancer usability after HDFS-8818. Contributed by (kihwal:
rev 8e3a992eccff26a7344c3f0e719898fa97706b8c)
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Dispatcher.java
> Improve balancer usability after HDFS-8818
> ------------------------------------------
>
> Key: HDFS-11742
> URL: https://issues.apache.org/jira/browse/HDFS-11742
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Priority: Blocker
> Labels: release-blocker
> Attachments: balancer2.8.png, balancer_fix.png,
> HDFS-11742.branch-2.8.patch, HDFS-11742.branch-2.patch,
> HDFS-11742.trunk.patch, HDFS-11742.v2.trunk.patch, replaceBlockNumOps-8w.jpg
>
>
> We ran 2.8 balancer with HDFS-8818 on a 280-node and a 2,400-node cluster. In
> both cases, it would hang forever after two iterations. The two iterations
> were also moving things at a significantly lower rate. The hang itself is
> fixed by HDFS-11377, but the design limitation remains, so the balancer
> throughput ends up actually lower.
> Instead of reverting HDFS-8188 as originally suggested, I am making a small
> change to make it less error prone and more usable.
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