From 0c7644bbab0d91e5cdb6e5a810dd22346118b750 Mon Sep 17 00:00:00 2001
From: Reynold Xin
How large a cluster can Spark scale to?
-Many organizations run Spark on clusters with thousands of nodes.
+Many organizations run Spark on clusters with thousands of nodes. The largest cluster we know has over 8000 nodes.
What happens if my dataset does not fit in memory?
Often each partition of data is small and does fit in memory, and these partitions are processed a few at a time. For very large partitions that do not fit in memory, Spark's built-in operators perform external operations on datasets.
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