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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9789) Support server advertised kerberos principals
Date Tue, 06 Aug 2013 20:58:49 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13731261#comment-13731261
] 

Daryn Sharp commented on HADOOP-9789:
-------------------------------------

If I understand the suggestion, per-NN SPN patterns requires conf updates every time a new
NN is "HA enabled" which kind of defeats the goal of not managing conf changes.  Then you
have to contemplate do you key on the IP, the given hostname, its canonicalized hostname,
etc.  I envision it being set to something like "hdfs/*-nn?.domain@REALM".

As for #2, in the absence of a SPN pattern key, it will do exactly what it did before.
                
> Support server advertised kerberos principals
> ---------------------------------------------
>
>                 Key: HADOOP-9789
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9789
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: ipc, security
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: HADOOP-9789.patch, HADOOP-9789.patch
>
>
> The RPC client currently constructs the kerberos principal based on the a config value,
usually with an _HOST substitution.  This means the service principal must match the hostname
the client is using to connect.  This causes problems:
> * Prevents using HA with IP failover when the servers have distinct principals from the
failover hostname
> * Prevents clients from being able to access a service bound to multiple interfaces.
 Only the interface that matches the server's principal may be used.
> The client should be able to use the SASL advertised principal (HADOOP-9698), with appropriate
safeguards, to acquire the correct service ticket.

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