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https://issues.apache.org/jira/browse/HDFS-14887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16953909#comment-16953909
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Takanobu Asanuma commented on HDFS-14887:
-----------------------------------------

Thanks for the discussion and updating the patch, [~hemanthboyina] and 
[~elgoiri].

I tested with 008 patch and found that the observer icon is used in the 
Nameservice Information when there are ActiveNN and ObserverNN in the same 
nameservice. Please see [^14887.008.png].
 * This is because the enum order in {{FederationNamenodeServiceState}} is used 
for the comparator. I think the order should be ACTIVE > OBSERVER > STANDBY.
 * I want to use the same order(active>observer>stadby) in 
{{FederationNamenodeServiceState#getState()}} and {{augment_namenodes()}} in 
federationhealth.js.
 * We may also need to add the observer icon to 
federationhealth-namenode-legend in Nameservice Information.

> RBF: In Router Web UI, Observer Namenode Information displaying as Unavailable
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-14887
>                 URL: https://issues.apache.org/jira/browse/HDFS-14887
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: hemanthboyina
>            Assignee: hemanthboyina
>            Priority: Major
>         Attachments: 14887.008.png, 14887.after.png, 14887.before.png, 
> HDFS-14887.001.patch, HDFS-14887.002.patch, HDFS-14887.003.patch, 
> HDFS-14887.004.patch, HDFS-14887.005.patch, HDFS-14887.006.patch, 
> HDFS-14887.007.patch, HDFS-14887.008.patch
>
>
> In Router Web UI, Observer Namenode Information displaying as Unavailable.
> We should show a proper icon for them.



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