Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/4665#discussion_r25035980
--- Diff: docs/configuration.md ---
@@ -115,6 +115,8 @@ of the most common options to set are:
<td>
Amount of memory to use for the driver process, i.e. where
SparkContext is initialized.
(e.g. <code>512m</code>, <code>2g</code>).
+
+ <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 the run-time settings
; i.e. --driver-memory 2g or within <code>conf/spark-defaults.conf</code>.
--- End diff --
what does `(e.g. YARN deployment)` mean? I would just rephrase this whole
thing with:
```
<br/>Note: 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
<code>--driver-memory</code> command line option or in your default properties
file.
```
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