Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/5719#discussion_r29551225
--- Diff: docs/running-on-yarn.md ---
@@ -134,6 +134,13 @@ Most of the configs are the same for Spark on YARN as
for other deployment modes
</td>
</tr>
<tr>
+ <td><code>spark.yarn.am.port</code></td>
+ <td>(random)</td>
+ <td>
+ Port for the YARN Application Master to listen on. In yarn client
mode, this is used to communicate between the spark driver running on a gateway
and the application master running on yarn. In yarn cluster mode, this is used
for the dynamic executor feature, where it handles the kill from the scheduler
backend.
--- End diff --
Nits: yarn -> YARN, spark -> Spark, 'application master' -> 'Application
Master'. Is this really the most accurate description of the AM role? it's
where you find the Spark UI, right? the rest of this info isn't so useful to
callers. It's just the port where the AM listens.
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