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https://issues.apache.org/jira/browse/HDFS-11742?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brahma Reddy Battula updated HDFS-11742:
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Labels: (was: release-blocker)
> 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
> Fix For: 2.9.0, 2.7.4, 3.0.0-beta1, 2.8.3
>
> 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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