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https://issues.apache.org/jira/browse/HDFS-14351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16790769#comment-16790769
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Íñigo Goiri commented on HDFS-14351:
------------------------------------

Thanks [~hexiaoqiao] for the rebase.
I would extend the test to test both cases and a couple more:
* "ns1,nn0,ns1,nn1"
* "ns1,nn0, ns1,nn1"
* " ns1,nn0,ns1,nn1"
* "ns1,nn0,ns1,nn1 "

Here we can also clean the double initialization of the {{StringBuilder}} (this 
was already there).

It might be worth adding a test just for this instead of going through the 
whole TestRouterNamenodeMonitoring; up to you.

> RBF: Optimize configuration item resolving for monitor namenode
> ---------------------------------------------------------------
>
>                 Key: HDFS-14351
>                 URL: https://issues.apache.org/jira/browse/HDFS-14351
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: rbf
>            Reporter: He Xiaoqiao
>            Assignee: He Xiaoqiao
>            Priority: Major
>         Attachments: HDFS-14351-HDFS-13891.001.patch, HDFS-14351.001.patch, 
> HDFS-14351.002.patch
>
>
> We invoke {{configuration.get}} to resolve configuration item 
> `dfs.federation.router.monitor.namenode` at `Router.java`, then split the 
> value by comma to get nsid and nnid, it may confused users since this is not 
> compatible with blank space but other common parameters could do. The 
> following segment show example that resolve fails.
> {code:java}
>   <property>
>     <name>dfs.federation.router.monitor.namenode</name>
>     <value>nameservice1.nn1, nameservice1.nn2</value>
>     <description>
>       The identifier of the namenodes to monitor and heartbeat.
>     </description>
>   </property>
> {code}



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