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Update Spark_RDD.md

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@ -156,7 +156,7 @@ Spark支持多种缓存级别 ：
### 4.2 使用缓存 ### 4.2 使用缓存
缓存数据的方法有两个：`persist`和`cache` 。`cache`内部调用的也是`persist`，其等价于`persist(StorageLevel.MEMORY_ONLY)`。示例如下： 缓存数据的方法有两个：`persist`和`cache` 。`cache`内部调用的也是`persist`，它是`persist`的特殊化形式，等价于`persist(StorageLevel.MEMORY_ONLY)`。示例如下：
```scala ```scala
// 所有存储级别均定义在StorageLevel对象中 // 所有存储级别均定义在StorageLevel对象中