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https://issues.apache.org/jira/browse/HDFS-11038?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaobing Zhou updated HDFS-11038:
---------------------------------
    Fix Version/s:     (was: 2.9.0)

> 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
>
> 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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