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https://issues.apache.org/jira/browse/HDFS-8826?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo Nicholas Sze updated HDFS-8826:
--------------------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
Fix Version/s: 2.8.0
Status: Resolved (was: Patch Available)
Thanks Arpit for reviewing the patch.
I have committed this.
> Balancer may not move blocks efficiently in some cases
> ------------------------------------------------------
>
> Key: HDFS-8826
> URL: https://issues.apache.org/jira/browse/HDFS-8826
> 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
>
> Attachments: h8826_20150811.patch, h8826_20150816.patch,
> h8826_20150818.patch
>
>
> Balancer is inefficient in the following case:
> || Datanode || Utilization || Rack ||
> | D1 | 95% | A |
> | D2 | 30% | B |
> | D3, D4, D5 | 0% | B |
> The average utilization is 25% so that D2 is within 10% threshold. However,
> Balancer currently will first move blocks from D2 to D3, D4 and D5 since they
> are under the same rack. Then, it will move blocks from D1.
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