Github user WangTaoTheTonic commented on a diff in the pull request:
https://github.com/apache/spark/pull/5719#discussion_r29315711
--- 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. This is used for
communicating with the executors.
--- End diff --
Is this channel to communicate with driver either?
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