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                            # 一、消息丟失的原因
①消息生產者沒有成功發送消息到MQ    
②消息發送成功，但是MQ宕機了，（沒來得及持久化）內存丟失
③消費者獲取消息，但是還沒來得及處理，消費者宕機了，由于MQ已經把數據刪除，不能再重新獲取之前的消息
# 二、如何保證不丟失
⑴針對①：在MQ獲取消息之后返回給生產者一個確認信息
⑵針對②：通過配置刷盤和復制參數，讓消息寫入多個副本的磁盤上，來確保消息不會因為某個Broker宕機或者磁盤損壞而丟失
⑶針對③：消費者處理完邏輯后返回MQ一個ack確認，再進行刪除（可能會造成重復消費）
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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