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

    https://github.com/apache/zookeeper/pull/308#discussion_r131591962
  
    --- Diff: 
src/java/main/org/apache/zookeeper/server/quorum/QuorumCnxManager.java ---
    @@ -880,19 +876,20 @@ public void run() {
              * 
              * @return boolean  Value of variable running
              */
    -        synchronized boolean finish() {
    -            if(!running){
    -                /*
    -                 * Avoids running finish() twice. 
    -                 */
    -                return running;
    -            }
    -            running = false;            
    -
    -            this.interrupt();
    -            threadCnt.decrementAndGet();
    -            return running;
    -        }
    +           boolean finish() {
    --- End diff --
    
    Yes.we should keep a blance between optimization and readability.the most 
importance thing for this optimization is whether this function has faced a 
performace problem and this optimization is overdesign. 
Haha.self-criticism.However ,I find the shadow of this programming paradigm in 
zk code base 
[Line501~Line507](https://github.com/apache/zookeeper/blob/master/src/java/main/org/apache/zookeeper/ClientCnxn.java
 ) 



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