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https://issues.apache.org/jira/browse/HDFS-5958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14643750#comment-14643750
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Tsz Wo Nicholas Sze commented on HDFS-5958:
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> ... in my case I had a 20% utilized box, a few 80-90% utilized ones and that
> huge 4% utilized machine, ...
In this case, Balancer should move blocks from the 80-90% utilized machines to
the other machines. No?
> One very large node in a cluster prevents balancer from balancing data
> ----------------------------------------------------------------------
>
> Key: HDFS-5958
> URL: https://issues.apache.org/jira/browse/HDFS-5958
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer & mover
> Affects Versions: 2.2.0
> Environment: Hadoop cluster with 4 nodes: 3 with 500Gb drives and one
> with 4Tb drive.
> Reporter: Alexey Kovyrin
>
> In a cluster with a set of small nodes and one much larger node balancer
> always selects the large node as the target even though it already has a copy
> of each block in the cluster.
> This causes the balancer to enter an infinite loop and stop balancing other
> nodes because each balancing iteration selects the same target and then could
> not find a single block to move.
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