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                            檢查點：類似于快照。
```scala
// 設置檢查點生成數據在hdfs上的存儲目錄
sc.setCheckpointDir("hdfs:/checkpoint0918")
val rdd=sc.parallelize(List(('a',1), ('a',2), ('b',3), ('c',4)))
rdd.checkpoint // 使用檢查點
rdd.collect // 調用Action算子后生成快照
rdd.isCheckpointed // rdd是否啟用了檢查點，是返回true
rdd.getCheckpointFile // 獲取此RDD檢查點所在的目錄的名稱
``` 
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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