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https://issues.apache.org/jira/browse/HDFS-11742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15999087#comment-15999087
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Tsz Wo Nicholas Sze commented on HDFS-11742:
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> HDFS-8188 has problems. ...
BTW, the JIRA you referring to should be HDFS-8818, not HDFS-8188. You may
want to relax, claim down and then fix the typos.
> Improve balancer usability after HDFS-8188
> ------------------------------------------
>
> 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, HDFS-11742.branch-2.8.patch,
> HDFS-11742.branch-2.patch, HDFS-11742.trunk.patch, HDFS-11742.v2.trunk.patch
>
>
> 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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