Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/22852#discussion_r228536280
--- Diff: docs/security.md ---
@@ -6,7 +6,20 @@ title: Security
* This will become a table of contents (this text will be scraped).
{:toc}
-# Spark RPC
+# Spark Security Overview
+
+Security in Spark is OFF by default. This could mean you are vulnerable to
attack by default.
+Spark supports multiple deployments types and each one supports different
levels of security. Not
+all deployment types will be secure in all environments and none are
secure by default. Be
+sure to evaluate your environment, what Spark supports, and take the
appropriate measure to secure
+your Spark deployment
+
+There are many different types of security concerns, Spark does not
necessarily protect against
--- End diff --
nit: concerns, -> concerns.
And similarly in a couple other sentences.
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