Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/4665#discussion_r25037050
--- Diff: docs/configuration.md ---
@@ -237,6 +258,8 @@ Apart from these, the following properties are also
available, and may be useful
(Experimental) Whether to give user-added jars precedence over Spark's
own jars when loading
classes in the the driver. This feature can be used to mitigate
conflicts between Spark's
dependencies and user dependencies. It is currently an experimental
feature.
+
+ <br /><em>Note:</em> setting this with <code>conf.set(...)</code> only
works in <code>cluster</code> mode (e.g. YARN deployment). For
<code>client</code> driver memory should be configured in
<code>conf/spark-defaults.conf</code> or via the run-time settings (See
Dynamically Loading Spark Properties).
--- End diff --
actually, this one doesn't apply here. Instead, you should just replace
this one with
```
This is used in cluster mode only.
```
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