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

    https://github.com/apache/drill/pull/773#discussion_r114339835
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/rpc/user/UserClient.java ---
    @@ -201,10 +223,12 @@ protected SaslException mapException(Exception e) {
                 if (e instanceof ExecutionException) {
                   final Throwable cause = Throwables.getRootCause(e);
                   if (cause instanceof SaslException) {
    -                return new SaslException("Authentication failed: " + 
cause.getMessage(), cause);
    +                return new SaslException(String.format("Authentication 
failed with encryption context %s with error %s",
    --- End diff --
    
    For an end user, this is a dense error message:
    
    > Authentication failed with encryption context Encryption: .. , 
MaxWrappedChunkSize: .. , MaxRawWrapSendSize ..  with error ..
    
    Could we improve the error message, here and below?


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