Program: 8160
Project: 8160
Buggy source:
void syncedUpdateBrokersInfo() throws NotifyRemotingException, InterruptedException {
  this.lock.lock();
  try {
    final Map<Integer,String> newBrokerStringMap=ProducerZooKeeper.this.metaZookeeper.getMasterBrokersByTopic(this.topic);
    final List<String> topics=new ArrayList<String>(1);
    topics.add(this.topic);
    final Map<String,List<Partition>> newTopicPartitionMap=ProducerZooKeeper.this.metaZookeeper.getPartitionsForTopicsFromMaster(topics);
    log.warn("String_Node_Str" + this.topic + "String_Node_Str"+ newTopicPartitionMap);
    for (    final Map.Entry<Integer,String> oldEntry : this.brokersInfo.oldBrokerStringMap.entrySet()) {
      final Integer oldBrokerId=oldEntry.getKey();
      final String oldBrokerString=oldEntry.getValue();
      final String newBrokerString=newBrokerStringMap.get(oldBrokerId);
      if (newBrokerStringMap.containsKey(oldBrokerId)) {
        if (!newBrokerString.equals(oldBrokerString)) {
          ProducerZooKeeper.this.remotingClient.close(oldBrokerString,false);
          ProducerZooKeeper.this.remotingClient.connect(newBrokerString);
          ProducerZooKeeper.this.remotingClient.awaitReadyInterrupt(newBrokerString);
          log.warn("String_Node_Str" + oldBrokerString + "String_Node_Str"+ newBrokerString);
        }
 else {
        }
      }
 else {
        ProducerZooKeeper.this.remotingClient.close(oldBrokerString,false);
        log.warn("String_Node_Str" + oldBrokerString);
      }
    }
    for (    final Map.Entry<Integer,String> newEntry : newBrokerStringMap.entrySet()) {
      final Integer newBrokerId=newEntry.getKey();
      final String newBrokerString=newEntry.getValue();
      if (!this.brokersInfo.oldBrokerStringMap.containsKey(newBrokerId)) {
        ProducerZooKeeper.this.remotingClient.connect(newBrokerString);
        ProducerZooKeeper.this.remotingClient.awaitReadyInterrupt(newBrokerString);
        log.warn("String_Node_Str" + newBrokerString);
      }
    }
    this.brokersInfo=new BrokersInfo(newBrokerStringMap,newTopicPartitionMap);
    log.warn("String_Node_Str" + this.topic);
  }
  finally {
    this.lock.unlock();
  }
}

Fixed version (ground truth):
void syncedUpdateBrokersInfo() throws NotifyRemotingException, InterruptedException {
  this.lock.lock();
  try {
    final Map<Integer,String> newBrokerStringMap=ProducerZooKeeper.this.metaZookeeper.getMasterBrokersByTopic(this.topic);
    final List<String> topics=new ArrayList<String>(1);
    topics.add(this.topic);
    final Map<String,List<Partition>> newTopicPartitionMap=ProducerZooKeeper.this.metaZookeeper.getPartitionsForTopicsFromMaster(topics);
    log.warn("String_Node_Str" + this.topic + "String_Node_Str"+ newTopicPartitionMap);
    for (    final Map.Entry<Integer,String> newEntry : newBrokerStringMap.entrySet()) {
      final Integer newBrokerId=newEntry.getKey();
      final String newBrokerString=newEntry.getValue();
      if (!this.brokersInfo.oldBrokerStringMap.containsKey(newBrokerId)) {
        ProducerZooKeeper.this.remotingClient.connect(newBrokerString);
        ProducerZooKeeper.this.remotingClient.awaitReadyInterrupt(newBrokerString);
        log.warn("String_Node_Str" + newBrokerString);
      }
    }
    this.brokersInfo=new BrokersInfo(newBrokerStringMap,newTopicPartitionMap);
    for (    final Map.Entry<Integer,String> oldEntry : this.brokersInfo.oldBrokerStringMap.entrySet()) {
      final Integer oldBrokerId=oldEntry.getKey();
      final String oldBrokerString=oldEntry.getValue();
      final String newBrokerString=newBrokerStringMap.get(oldBrokerId);
      if (newBrokerStringMap.containsKey(oldBrokerId)) {
        if (!newBrokerString.equals(oldBrokerString)) {
          log.warn("String_Node_Str" + oldBrokerString + "String_Node_Str"+ newBrokerString);
          ProducerZooKeeper.this.remotingClient.connect(newBrokerString);
          ProducerZooKeeper.this.remotingClient.awaitReadyInterrupt(newBrokerString);
          ProducerZooKeeper.this.remotingClient.close(oldBrokerString,false);
        }
 else {
        }
      }
 else {
        ProducerZooKeeper.this.remotingClient.close(oldBrokerString,false);
        log.warn("String_Node_Str" + oldBrokerString);
      }
    }
    log.warn("String_Node_Str" + this.topic);
  }
  finally {
    this.lock.unlock();
  }
}