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ZooKeeper在Kafka中的作用

* Broker注冊并監控狀態
	* znode:/brokers/ids，保存了所有 Broker id，實現對 Broker 的動態監控。
* Topic注冊
	* znode:/brokers/topics，保存了所有 Topic。
* 生產者負載均衡
	* 每個Broker啟動時，都會完成Broker注冊過程，生產者會通過該節點的變化來動態地感知到Broker服務器列表的變更
* offset維護
	* Kafka早期版本使用ZooKeeper為每個消費者存儲offset，由于ZooKeeper寫入性能較差，從0.10版本后，Kafka使用自己的內部主題維護offset
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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