Lantao Jin resolved HDFS-11360.
    Resolution: Duplicate
      Assignee: Lantao Jin

> HDFS balancer need a config to appoint to a decided nameservice
> ---------------------------------------------------------------
>                 Key: HDFS-11360
>                 URL: https://issues.apache.org/jira/browse/HDFS-11360
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer & mover
>    Affects Versions: 2.7.1
>            Reporter: Lantao Jin
>            Assignee: Lantao Jin
>            Priority: Minor
> With distcp configuration, there are two or more "nameservices" setting in 
> hdfs-site.xml, for example:
> {code}
>     <property>
>         <name>dfs.nameservices</name>
>         <value>one-nn-ha,two-nn-ha</value>
>     </property>
> {code}
> If the HDFS Balancer also launches in that node, it will create two IPC 
> threads to connect both of NNs. And block removing both happens in this 
> Balancer. Although I didn't find any block removing between different 
> clusters, the behavior still became weird and unexpected.
> So the best way is adding a configuration that appoint to a decided 
> nameservice to launch. I can offer a patch. Any better ideal? 

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