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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4457) WebHDFS obtains/sets delegation token service hostname using wrong config leading to issues when NN is configured with 0.0.0.0 RPC IP
Date Thu, 31 Jan 2013 22:43:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13568205#comment-13568205
] 

Alejandro Abdelnur commented on HDFS-4457:
------------------------------------------

Thanks, that clarifies things a bit. 

Following up, with this patch the clients of the WebHFDS service are 'sending' (as part of
the HTTP request info) the hostname to WebHDFS and WebHDFS is setting it on its behalf. This
is critical for client environments that do not have (and cannot have) a hadoop client setup
(which would allow them to run fetchdt -assuming we fix up fetchdt to serve WebHDFS tokens,
which are not served today-).

Hope this clarifies.
                
> WebHDFS obtains/sets delegation token service hostname using wrong config leading to
issues when NN is configured with 0.0.0.0 RPC IP
> -------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-4457
>                 URL: https://issues.apache.org/jira/browse/HDFS-4457
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: webhdfs
>    Affects Versions: 1.1.1, 2.0.2-alpha
>            Reporter: Alejandro Abdelnur
>            Assignee: Alejandro Abdelnur
>            Priority: Critical
>         Attachments: HDFS_4457.patch, HDFS_4457.patch
>
>
> If the NameNode RPC address is configured with an wildcard IP 0.0.0.0, then delegationotkens
are configured with 0.0.0.0 as service and this breaks clients trying to use those tokens.
> Looking at NamenodeWebHdfsMethods#generateDelegationToken() the problem is SecurityUtil.setTokenService(t,
namenode.getHttpAddress());, tracing back what is being used to resolve getHttpAddress() the
NameNodeHttpServer is resolving the httpAddress doing a httpAddress = new InetSocketAddress(bindAddress.getAddress(),
httpServer.getPort());
> , and if using "0.0.0.0" in the configuration, you get 0.0.0.0 from bindAddress.getAddress().
> Normally (non webhdfs) this is not an issue because it is the responsibility of the client,
but in the case of WebHDFS, WebHDFS does it before returning the string version of the token
(it must be this way because the client may not be a java client at all and cannot manipulate
the DelegationToken as such).
> The solution (thanks to Eric Sammer for helping figure this out) is for WebHDFS to use
the exacty hostname that came in the HTTP request as the service to set in the delegation
tokens.

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