Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/16856#discussion_r104255651
--- Diff: docs/quick-start.md ---
@@ -10,12 +10,13 @@ description: Quick start tutorial for Spark
SPARK_VERSION_SHORT
This tutorial provides a quick introduction to using Spark. We will first
introduce the API through Spark's
interactive shell (in Python or Scala),
then show how to write applications in Java, Scala, and Python.
-See the [programming guide](programming-guide.html) for a more complete
reference.
To follow along with this guide, first download a packaged release of
Spark from the
[Spark website](http://spark.apache.org/downloads.html). Since we won't be
using HDFS,
you can download a package for any version of Hadoop.
+Note that, before Spark 2.0, the main programming interface of Spark was
Resilient Distributed Dataset (RDD). After Spark 2.0, RDD is replaced by
Dataset, which is strongly typed like RDD, but with richer optimizations under
the hood. The RDD interface is still supported, and you can get a more complete
reference at [RDD programming guide](rdd-programming-guide.html). However, we
highly recommend you to switch to use Dataset, which has better performance
than RDD. See [SQL programming guide](sql-programming-guide.html) to get more
information about Dataset.
--- End diff --
Not a big deal, but it should probably say things like "_the_ Resilient
Distributed Dataset" and "RDDs are replaced" vs "RDD is replaced" and "like an
RDD" vs "like RDD"? and "the SQL programming guide", "the RDD programming guide"
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