Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/19826#discussion_r153211514
--- Diff: docs/configuration.md ---
@@ -2306,6 +2306,50 @@ showDF(properties, numRows = 200, truncate = FALSE)
</tr>
</table>
+### Spark Application Garbage Collector
+
+<table class="table">
+ <tr><th>Property Name</th><th>Default</th><th>Meaning</th></tr>
+ <tr>
+ <td><code>spark.cleaner.periodicGC.interval</code></td>
+ <td>30min</td>
+ <td>
+ Controls how often to trigger a garbage collection.
+ </td>
+ </tr>
+ <tr>
+ <td><code>spark.cleaner.referenceTracking</code></td>
+ <td>true</td>
+ <td>
+ Controls whether a ContextCleaner should be created when a
SparkContext initializes.
+ </td>
+ </tr>
+ <tr>
+ <td><code>spark.cleaner.referenceTracking.blocking</code></td>
+ <td>true</td>
+ <td>
+ Controls whether the cleaning thread should block on cleanup tasks
(other than shuffle, which is controlled by
+ spark.cleaner.referenceTracking.blocking.shuffle Spark
property).<br><br>
--- End diff --
You might surround prop names in `<code>` for extra clarity
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