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From "Robert Kanter (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-6602) Impersonation does not work if standby RM is contacted first
Date Mon, 15 May 2017 17:51:04 GMT
Robert Kanter created YARN-6602:
-----------------------------------

             Summary: Impersonation does not work if standby RM is contacted first
                 Key: YARN-6602
                 URL: https://issues.apache.org/jira/browse/YARN-6602
             Project: Hadoop YARN
          Issue Type: Bug
          Components: client
    Affects Versions: 3.0.0-alpha3
            Reporter: Robert Kanter
            Assignee: Robert Kanter
            Priority: Blocker


When RM HA is enabled, impersonation does not work correctly if the Yarn Client connects to
the standby RM first.  When this happens, the impersonation is "lost" and the client does
things on behalf of the impersonator user.  We saw this with the OOZIE-1770 Oozie on Yarn
feature.

I need to investigate this some more, but it appears to be related to delegation tokens. 
When this issue occurs, the tokens have the owner as "oozie" instead of the actual user. 
On a hunch, we found a workaround that explicitly adding a correct RM HA delegation token
fixes the problem:
{code:java}
org.apache.hadoop.yarn.api.records.Token token = yarnClient.getRMDelegationToken(ClientRMProxy.getRMDelegationTokenService(conf));
org.apache.hadoop.security.token.Token token2 = new org.apache.hadoop.security.token.Token(token.getIdentifier().array(),
token.getPassword().array(), new Text(token.getKind()), new Text(token.getService()));
UserGroupInformation.getCurrentUser().addToken(token2);
{code}




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