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https://issues.apache.org/jira/browse/HDFS-9940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15198264#comment-15198264
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Tsz Wo Nicholas Sze commented on HDFS-9940:
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Thanks Yongjun for the note. I agree that it should work.
Then, Balancer should only query the the DN conf but not change it. It is fine
if Balancer value <= DN value. Otherwise, Balancer could warn the admin or
throw an exception. The admin could set the DN value using the reconfig
command if desirable. In this way, DNs are still protected.
> About abusing the cluster by Balancer, the balancer can only be run as admin
> user "hdfs", right?
Admin sometime makes mistakes. We should make it hard to make mistakes.
> Rename dfs.balancer.max.concurrent.moves to avoid confusion
> -----------------------------------------------------------
>
> Key: HDFS-9940
> URL: https://issues.apache.org/jira/browse/HDFS-9940
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: balancer & mover
> Affects Versions: 2.6.0
> Reporter: John Zhuge
> Assignee: John Zhuge
> Priority: Minor
> Labels: supportability
> Fix For: 2.8.0
>
>
> It is very confusing for both Balancer and Datanode to use the same property
> {{dfs.datanode.balance.max.concurrent.moves}}. It is especially so for the
> Balancer because the property has "datanode" in the name string. Many
> customers forget to set the property for the Balancer.
> Change the Balancer to use a new property
> {{dfs.balancer.max.concurrent.moves}}.
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