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

    https://github.com/apache/zookeeper/pull/184#discussion_r221069516
  
    --- Diff: 
src/java/main/org/apache/zookeeper/server/quorum/QuorumCnxManager.java ---
    @@ -534,14 +543,12 @@ private void handleConnection(Socket sock, 
DataInputStream din)
                     LOG.info("Setting arbitrary identifier to observer: " + 
sid);
                 }
             } catch (IOException e) {
    +            LOG.warn("Exception reading or writing challenge: {}", e);
                 closeSocket(sock);
    -            LOG.warn("Exception reading or writing challenge: {}", 
e.toString());
                 return;
             }
    -
    --- End diff --
    
    nit: keep this empty line.


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