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                            Mapreduce 確保每個 reducer 的輸入都是按鍵排序的。數據從 map 輸出到reducer 輸入的過程稱為 shuffle。

:-: ![](https://img.kancloud.cn/ba/52/ba52af2468b22e9070e83635dd7fe84b_1289x389.png)
Shuffle流程圖

Shuffle的流程就是：分區 -> 排序 -> 溢寫


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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