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https://issues.apache.org/jira/browse/HDFS-14035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16677380#comment-16677380
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Erik Krogen commented on HDFS-14035:
------------------------------------

This approach LGTM, thanks [~vagarychen]! A few comments:
* Within {{NNProxyInfo}}, we changed {{serviceProxy}} from a 
{{HAServiceProtocol}} to a {{ClientProtocol}}, should we also change the field 
name?
* Should {{ClientProtocol#getHAServiceState()}} be annotated 
{{@ReadOnly(isCoordinated = false)}} ?
* You changed {{HAServiceProtocol.HAServiceState}} to include a {{static}} 
modifier, but it is redundant as {{HAServiceProtocol}} is an interface so all 
inner classes are static (also all inner enums are static regardless of whether 
their container is an interface).

> NN status discovery does not leverage delegation token
> ------------------------------------------------------
>
>                 Key: HDFS-14035
>                 URL: https://issues.apache.org/jira/browse/HDFS-14035
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Chen Liang
>            Assignee: Chen Liang
>            Priority: Major
>         Attachments: HDFS-14035-HDFS-12943.001.patch, 
> HDFS-14035-HDFS-12943.002.patch, HDFS-14035-HDFS-12943.003.patch, 
> HDFS-14035-HDFS-12943.004.patch, HDFS-14035-HDFS-12943.005.patch, 
> HDFS-14035-HDFS-12943.006.patch, HDFS-14035-HDFS-12943.007.patch
>
>
> Currently ObserverReadProxyProvider uses 
> {{HAServiceProtocol#getServiceStatus}} to get the status of each NN. However 
> {{HAServiceProtocol}} does not leverage delegation token. So when running an 
> application on YARN and when YARN node manager makes this call 
> getServiceStatus, token authentication will fail, causing the application to 
> fail.



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