Github user sohami commented on a diff in the pull request:

    https://github.com/apache/drill/pull/773#discussion_r111646441
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/rpc/security/AuthenticationOutcomeListener.java
 ---
    @@ -120,19 +121,22 @@ public void success(SaslMessage value, ByteBuf 
buffer) {
               new SaslException("Server sent a corrupt message.")));
         } else {
           try {
    -        final SaslChallengeContext context = new 
SaslChallengeContext(value, connection.getSaslClient(), ugi);
    -
    +        final SaslChallengeContext<C> context = new 
SaslChallengeContext<>(value, ugi, connection);
             final SaslMessage saslResponse = processor.process(context);
     
             if (saslResponse != null) {
               client.send(new AuthenticationOutcomeListener<>(client, 
connection, saslRpcType, ugi, completionListener),
                   connection, saslRpcType, saslResponse, SaslMessage.class,
    -              true /** the connection will not be backed up at this point 
*/);
    +              true /* the connection will not be backed up at this point 
*/);
             } else {
               // success
               completionListener.success(null, null);
    +          logger.trace("Successfully authenticated to server using {} 
mechanism and encryption context: {}",
    --- End diff --
    
    trying to understand why this check is needed here ? Whereas other places 
we just end up using logger.trace as is ? E.g: above `logger.trace("Initiated 
SASL exchange")`


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