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                            1.  DataNode可以失效

    DataNode會定時發送心跳到NameNode。如果在一段時間內NameNode沒有收到DataNode的心跳消息，則認為其失效。此時NameNode就會將該節點的數據（從該節點的復制節點中獲取）復制到另外的DataNode中

2.  數據可以毀壞

    無論是寫入時還是硬盤本身的問題，只要數據有問題（讀取時通過校驗碼來檢測），都可以通過其他的復制節點讀取，同時還會再復制一份到健康的節點中

3.  NameNode不可靠
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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