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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6334) Client failover proxy provider for IP failover based NN HA
Date Tue, 13 May 2014 02:25:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13995957#comment-13995957

Aaron T. Myers commented on HDFS-6334:

Patch looks great to me, Kihwal. Thanks for doing it. Two little nits:

# bq. +   * used, a special token handling mat be needed to make sure a token acquired 
# The method comment for {{ConfiguredFailoverProxyProvider#useLogicalURI}} says "Logical URI
is not used for IP failover." While strictly true, I'm guessing you meant to put a different
comment here.

+1 once these are addressed.

> Client failover proxy provider for IP failover based NN HA
> ----------------------------------------------------------
>                 Key: HDFS-6334
>                 URL: https://issues.apache.org/jira/browse/HDFS-6334
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>         Attachments: HDFS-6334.patch, HDFS-6334.v2.patch
> With RPCv9 and improvements in the SPNEGO auth handling, it is possible to set up a pair
of HA namenodes utilizing IP failover as client-request fencing mechanism.
> This jira will make it possible for HA to be configured without requiring use of logical
URI and provide a simple IP failover proxy provider.  The change will allow any old implementation
of {{FailoverProxyProvider}} to continue to work.

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