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

    https://github.com/apache/zookeeper/pull/184#discussion_r114086721
  
    --- Diff: src/java/main/org/apache/zookeeper/common/ZKConfig.java ---
    @@ -107,14 +99,33 @@ private void init() {
          * this configuration.
          */
         protected void handleBackwardCompatibility() {
    -        properties.put(SSL_KEYSTORE_LOCATION, 
System.getProperty(SSL_KEYSTORE_LOCATION));
    -        properties.put(SSL_KEYSTORE_PASSWD, 
System.getProperty(SSL_KEYSTORE_PASSWD));
    -        properties.put(SSL_TRUSTSTORE_LOCATION, 
System.getProperty(SSL_TRUSTSTORE_LOCATION));
    -        properties.put(SSL_TRUSTSTORE_PASSWD, 
System.getProperty(SSL_TRUSTSTORE_PASSWD));
    -        properties.put(SSL_AUTHPROVIDER, 
System.getProperty(SSL_AUTHPROVIDER));
             properties.put(JUTE_MAXBUFFER, System.getProperty(JUTE_MAXBUFFER));
             properties.put(KINIT_COMMAND, System.getProperty(KINIT_COMMAND));
             properties.put(JGSS_NATIVE, System.getProperty(JGSS_NATIVE));
    +
    +        ClientX509Util clientX509Util = new ClientX509Util();
    +        putSSLProperties(clientX509Util);
    +        properties.put(clientX509Util.getSslAuthProviderProperty(),
    +                
System.getProperty(clientX509Util.getSslAuthProviderProperty()));
    +
    +        putSSLProperties(new QuorumX509Util());
    --- End diff --
    
    Do we need this call here? This function handles backward compatibility 
between old way of extracting configs from system properties and the introduce 
of ZKConfig class (which was done after client-server SSL was added). Quorum 
ssl does not exist before, so there is no need to handle backward compatibility 
for it.
    
    If the purpose is to populate various system properties of quorum ssl then 
maybe find another place to make the initialization call?


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