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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Created] (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 00:17:13 GMT
Alejandro Abdelnur created HDFS-4457:
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             Summary: 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: 2.0.2-alpha, 1.1.1
            Reporter: Alejandro Abdelnur
            Priority: Critical


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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