How do I see how large a dataset is in Spark?
You can find the number of records in a DataFrame or RDD using the `count()` method. If you want to see how large it is in terms of bytes, you can find this information on the Spark UI.
<s>[QUESTION] How do I see how large a dataset is in Spark? [CONTEXT]  [ANSWER] You can find the number of records in a DataFrame or RDD using the `count()` method. If you want to see how large it is in terms of bytes, you can find this information on the Spark UI. </s>