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https://issues.apache.org/jira/browse/HDFS-5128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13749112#comment-13749112
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Kihwal Lee commented on HDFS-5128:
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This is a very useful feature for incorporating IP-failover to the existing HA. 
With the correct SPN pattern and NIC configuration, RPC over kerberos and token 
works without the client-side failover proxy. Client-side will still benefit 
from a simple proxy that does proper timeout & retry on StandbyException or 
connection reset.
                
> Allow multiple net interfaces to be used with HA namenode RPC server
> --------------------------------------------------------------------
>
>                 Key: HDFS-5128
>                 URL: https://issues.apache.org/jira/browse/HDFS-5128
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>         Attachments: HDFS-5128.branch-2.patch, HDFS-5128.trunk.patch
>
>
> With the new RPCv9, NN RPC server can be bound to multiple IP addresses and 
> serve clients connecting to different addressed using the same SPN. But the 
> only way to have NN bind to multiple addresses is to set its RPC address to 
> 0.0.0.0. This does not work well with HA especially when name nodes share the 
> same config. 
> I propose a new option for NN rpc server to bind to all interfaces, 
> independent of the rpc address configuration.

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