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Update programming-guide.md #8372

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2 changes: 1 addition & 1 deletion docs/programming-guide.md
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Expand Up @@ -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.
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