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                            ![](https://box.kancloud.cn/2015-07-23_55b03fb50c617.png)

1. 客戶端向NameNode發送讀取請求
1. NameNode#x8FD4;回文件的所有block和這些block所在的DataNodes（包括復制節點）
1. 客戶端直接從DataNode中讀取數據，如果該DataNode讀取失敗（DataNode失效或校驗碼不對），則從復制節點中讀取（如果讀取的數據就在本機，則直接讀取，否則通過網絡讀取）
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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