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                            服務降級有兩種手段：拒絕服務和關閉服務
* 拒絕服務：拒絕低優先級應用的調用，減少服務調用并發數，確保核心應用正常使用；或者隨機拒絕部分請求調用，節約資源，讓一部分請求得以成功
* 關閉功能：關閉部分不重要的服務，或者服務內部關閉部分不重要的功能，以節約系統開銷，為重要的服務和功能讓出資源


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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