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https://issues.apache.org/jira/browse/HDFS-11038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15609941#comment-15609941
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Xiaobing Zhou commented on HDFS-11038:
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Posted a patch v001 to cover the changes aforementioned.
> DiskBalancer: support running multiple commands under one setup of disk
> balancer
> --------------------------------------------------------------------------------
>
> Key: HDFS-11038
> URL: https://issues.apache.org/jira/browse/HDFS-11038
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: balancer & mover
> Reporter: Xiaobing Zhou
> Assignee: Xiaobing Zhou
> Attachments: HDFS-11038.000.patch, HDFS-11038.001.patch
>
>
> Disk balancer follows/reuses one rule designed by HDFS balancer, that is,
> only one instance is allowed to run at the same time. This is correct in
> production system to avoid any inconsistencies, but it's not ideal to write
> and run unit tests. For example, it should be allowed run plan, execute, scan
> commands under one setup of disk balancer. One instance rule will throw
> exception by complaining 'Another instance is running'. In such a case,
> there's no way to do a full life cycle tests which involves a sequence of
> commands.
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