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From "Philip Zeyliger (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5128) Allow multiple net interfaces to be used with HA namenode RPC server
Date Sun, 25 Aug 2013 01:39:55 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13749511#comment-13749511
] 

Philip Zeyliger commented on HDFS-5128:
---------------------------------------

It would be slightly more consistent to expose this as "rpc bind address" and have users specify
0.0.0.0 if they want to bind to the wildcard.  The existing bug and bad behavior is because
{{dfs.namenode.servicerpc-address}} doubles as both the address that clients should use to
connect and the address that the server should bind on.  If you want to be fully flexible,
you may as well separate those two.  Introducing a toggle for "bind to wildcard" is certainly
clear (and, in fact, it's exactly the toggle that we try to expose in Cloudera Manager as
a general practice), but since many other addresses in the Hadoop ecosystem already require
you to specify 0.0.0.0 to bind to the wildcard (e.g., that's what you do for the datanode),
it might be more consistent to have a bind address config option.
                
> 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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