Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/19826#discussion_r153211780
--- 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.
--- End diff --
You might give at least a sentence of explanation about what this has to do
with the context cleaner.
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