Github user gaborgsomogyi commented on a diff in the pull request:

    https://github.com/apache/spark/pull/19826#discussion_r153431033
  
    --- 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.
    --- End diff --
    
    Rephrased.


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