[jira] [Created] (KUDU-2379) Spark generates a broken authentication credentials PB

["Todd Lipcon (JIRA)" <ji...@apache.org>]

Todd Lipcon created KUDU-2379:
---------------------------------

             Summary: Spark generates a broken authentication credentials PB
                 Key: KUDU-2379
                 URL: https://issues.apache.org/jira/browse/KUDU-2379
             Project: Kudu
          Issue Type: Bug
          Components: java, spark
    Affects Versions: 1.7.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon


KUDU-2259 introduced a regression which causes Spark to not work properly on secure clusters. The issue is the following:
- the driver calls exportAuthenticationCredentials()
-- the client hasn't yet talked to the master, so it doesn't have any credentials yet, despite having a keytab available
-- the code is as follows:
{code}
    byte[] authnData = securityContext.exportAuthenticationCredentials();
    if (authnData != null) {
      return Deferred.fromResult(authnData);
    }
{code}
-- previously, authnData would be null in this case, and it would fall through to connect to the cluster and then export a proper token.
-- with the new implementation, an authnData is returned which is devoid of real credentials but contains a realUser. So, it's non-null, and it gets returned immediately
- the tasks then get credentials with no tokens and can't connect




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