Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/4665#discussion_r25036963
--- Diff: docs/configuration.md ---
@@ -214,6 +222,11 @@ Apart from these, the following properties are also
available, and may be useful
<td>(none)</td>
<td>
A string of extra JVM options to pass to the driver. For instance, GC
settings or other logging.
+
+ <br /><em>Note:</em> In client mode, this config must not be set
through the <code>SparkConf</code>
+ directly in your application, because the driver JVM has already
started at that point.
+ Instead, please set this through the command line option (see
Dynamically Loading Spark Properties)
+ or in your default properties file.</td>
--- End diff --
instead of `(see Dynamic Loading Spark Properties)`, we should be more
specific here with `--driver-java-options`
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