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                            * DStream離散數據流（Discretized Stream）是Spark Streaming提供的高級別抽象數據流。它表示連續的數據流，可以是從源接收到的輸入數據流，也可以是通過轉換輸入流生成的經過處理的數據流。
* DStream代表了一系列連續的RDDs
	* 每個RDD都包含一個時間間隔內的數據
	* DStream既是輸入的數據流，也是轉換處理過的數據流
	* 對DStream的轉換操作即是對具體RDD操作
	
:-: ![](https://img.kancloud.cn/c7/4a/c74a742f3d09363cf664e298f92f3899_831x128.png)
DStream與RDD的關系
<br/>

一個WordCount案例的DStream轉換過程如下：

:-: ![](https://img.kancloud.cn/84/2e/842e87113f6945ce63c2e5472ec70d2c_722x500.png)
DStream轉換

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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