Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/3409#discussion_r21707186
--- Diff: docs/running-on-yarn.md ---
@@ -139,6 +139,15 @@ Most of the configs are the same for Spark on YARN as
for other deployment modes
The maximum number of threads to use in the application master for
launching executor containers.
</td>
</tr>
+<tr>
+ <td><code>spark.yarn.am.extraJavaOptions</code></td>
+ <td>(none)</td>
+ <td>
+ A string of extra JVM options to pass to the Application Master in
yarn-client mode. For instance, specific
+ system properties. Note that it is complementary to
spark.driver.extraJavaOptions, which are only passed to
+ the Application Master in yarn-cluster mode.
--- End diff --
Also, I think the latter sentences are confusing. What does it mean to be
"complementary" to another config? We should just rephrase it as follows:
```
A string of extra JVM options to pass to the Yarn ApplicationMaster in
client mode. In cluster mode, use spark.driver.extraJavaOptions instead.
```
No need to mention "specific system properties"
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