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# 存儲方式

物理上把topic分成一個或多個partition(對應server.properties中的num.partitions=3配置),每個partition物理上對應一個文件夾(該文件夾存儲該partition的所有消息和索引文件)

# 存儲策略

無論消息是否被消費,kafka都會保留所有消息.有兩種策略可以刪除舊數據:
1. 基于時間: log.retention.hours=168
2. 基于大小: log.retention.bytes=1073741824
需要注意的是,因為kafka讀取特定消息的時間復雜度為O(1),即與文件大小無關,所以這里刪除過期文件與提高kafka性能無關

# zookeeper存儲結構

![](https://box.kancloud.cn/53ba8709d4c70b3ec4884be0648b6ad8_1028x565.png)

注意: producer不在zk注冊,消費者在zk中注冊


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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