Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/20167#discussion_r167061319
--- Diff: docs/running-on-mesos.md ---
@@ -427,15 +437,30 @@ See the [configuration page](configuration.html) for
information on Spark config
<td><code>spark.mesos.principal</code></td>
<td>(none)</td>
<td>
- Set the principal with which Spark framework will use to authenticate
with Mesos.
+ Set the principal with which Spark framework will use to authenticate
with Mesos. You can also specify this via the environment variable
`SPARK_MESOS_PRINCIPAL`
--- End diff --
nit: add period
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