Github user sohami commented on a diff in the pull request:
    --- Diff: exec/rpc/src/main/java/org/apache/drill/exec/rpc/ 
    @@ -69,6 +74,11 @@
       private final IdlePingHandler pingHandler;
       private ConnectionMultiListener.SSLHandshakeListener 
sslHandshakeListener = null;
    +  // Authentication related parameters
    +  protected volatile List<String> serverAuthMechanisms = null;
    --- End diff --
    On second thought volatile doesn't seem necessary here since it will only 
be accessed by Netty's thread which is also fixed for a connection. 
    Made fields private.


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