Ngone51 commented on a change in pull request #26676: 
[SPARK-28574][CORE][FOLLOW-UP] Several minor improvements for event queue 
capacity config
URL: https://github.com/apache/spark/pull/26676#discussion_r351076707
 
 

 ##########
 File path: docs/configuration.md
 ##########
 @@ -1852,9 +1852,11 @@ Apart from these, the following properties are also 
available, and may be useful
   <td><code>spark.scheduler.listenerbus.eventqueue.capacity</code></td>
   <td>10000</td>
   <td>
-    Capacity for event queue in Spark listener bus, must be greater than 0. 
Consider increasing
-    value (e.g. 20000) if listener events are dropped. Increasing this value 
may result in the
-    driver using more memory.
+    The default capacity for event queues. Spark will try to initialize an 
event queue 
+    using capacity specified by 
`spark.scheduler.listenerbus.eventqueue.queueName.capacity` 
 
 Review comment:
   err... shall we do another follow up ?

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