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https://issues.apache.org/jira/browse/HDFS-8549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Shvachko updated HDFS-8549:
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Labels: release-blocker (was: )
Target Version/s: 2.8.0, 2.7.4 (was: 2.8.0)
> Abort the balancer if an upgrade is in progress
> -----------------------------------------------
>
> Key: HDFS-8549
> URL: https://issues.apache.org/jira/browse/HDFS-8549
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: balancer & mover
> Affects Versions: 2.7.0
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Labels: release-blocker
> Fix For: 2.8.0, 3.0.0-alpha1
>
> Attachments: HDFS-8549.001.patch, HDFS-8549.002.patch,
> HDFS-8549.003.patch, HDFS-8549.004.patch
>
>
> Running the balancer during an ongoing upgrade has a negative affect, since
> DNs do not actually delete blocks. This means the balancer is making lots of
> extra replicas and not actually reducing the disk utilization of
> over-utilized nodes.
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