Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/4665#discussion_r25009940
--- 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 /><br />Note: this setting only works in <code>cluster</code> mode
(e.g. YARN deployment). In <code>client</code> mode (e.g. spark-shell), this
setting has no effect. In client mode, driver memory should be configured in
the run-time settings ; i.e. --driver-memory 2g.
--- End diff --
By the way this explanation isn't exactly true. It only doesn't work if you
set them through the `conf.set(...)` way. It still works if you put them in
your `conf/spark-defaults.conf` file.
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