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                            ### 消息刷盤
(1) 同步刷盤：只有在消息真正持久化至磁盤后RocketMQ的Broker端才會真正返回給Producer端一個成功的ACK響應。同步刷盤對MQ消息可靠性來說是一種不錯的保障，但是性能上會有較大影響，一般適用于金融業務應用該模式較多。

(2) 異步刷盤：能夠充分利用OS的PageCache的優勢，只要消息寫入PageCache即可將成功的ACK返回給Producer端。消息刷盤采用后臺異步線程提交的方式進行，降低了讀寫延遲，提高了MQ的性能和吞吐量
![](https://img.kancloud.cn/a8/7b/a87b43fa3f42a78d2f51ce028f2af009_664x612.png)


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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