Update programming-guide.md

Update `lineLengths.persist();` to `lineLengths.persist(StorageLevel.MEMORY_ONLY());` because `JavaRDD#persist` needs a parameter of `StorageLevel`. Author: Keiji Yoshida <[email protected]> Closes apache#8372 from yosssi/patch-1.
EugenCepoi · Aug 22, 2015 · 46fcb9e · 46fcb9e
1 parent 630a994
commit 46fcb9e
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/docs/programming-guide.md b/docs/programming-guide.md
@@ -549,7 +549,7 @@ returning only its answer to the driver program.
 If we also wanted to use `lineLengths` again later, we could add:
 
 {% highlight java %}
-lineLengths.persist();
+lineLengths.persist(StorageLevel.MEMORY_ONLY());
 {% endhighlight %}
 
 before the `reduce`, which would cause `lineLengths` to be saved in memory after the first time it is computed.