yutoacts commented on a change in pull request #350:
URL: https://github.com/apache/spark-website/pull/350#discussion_r680600573



##########
File path: site/developer-tools.html
##########
@@ -793,6 +793,18 @@ <h4>In Spark unit tests</h4>
 The platform-specific paths to the profiler agents are listed in the 
 <a href="http://www.yourkit.com/docs/80/help/agent.jsp";>YourKit 
documentation</a>.</p>
 
+<p><a name="local-cluster"></a></p>
+<h3>Local-cluster mode</h3>
+
+<p>When launching applications with spark-submit, besides options in 
+<a 
href="https://spark.apache.org/docs/latest/submitting-applications.html#master-urls";>Master
 URLs</a>
+, set local-cluster option to emulate a distributed cluster in a single 
JVM.</p>

Review comment:
       I thought it is not necessary as it's on a developer-tools page but I'm 
totally fine with explicitly saying that here.
   BTW if local-cluster mode ends up written in main documents 
(https://github.com/apache/spark/pull/33537), should it still be documented 
here?




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