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                            # 一.死信隊列
死信隊列,英文縮寫:`DLX` .`Dead Letter Exchange`(死信交換機),當消息成為了Dead message后,可以被重新發送到另一個交換機,這個交換機就是`DLX`
![](https://img.kancloud.cn/6c/e3/6ce3d781d1f9ce1f7dc2156eea49a3f3_705x206.jpg)
*****
# 消息成為死信的三種情況
### 1.隊列消息長度到達限制
### 2.消費者拒接消費消息,basicNack/basicReject,并且不把消息重新放入原目標隊列,requeue=false
### 3.原隊列存在消息過期設置,消息到達超時時間未被消費.
*****
# 隊列綁定死信交換機
### 給隊列設置參數 : `x-dead-letter-exchange`和`x-dead-letter-routing-key`
*****
# 小結
### 1.死信交換機和死信隊列和普通的沒有區別
### 2.當消息成為死信后,如果該隊列綁定了死信交換機,則消息會被死信交換機重新路由到死信隊列
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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