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https://issues.apache.org/jira/browse/HDFS-8824?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhe Zhang updated HDFS-8824:
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Fix Version/s: 2.7.4
Thanks Nicholas for the work. I think this is a good improvement for branch-2.7
and just backported. Verified {{TestBalancer}}.
> 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, 2.7.4, 3.0.0-alpha1
>
> 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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