Github user ash211 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/3689#discussion_r21794489
  
    --- Diff: docs/configuration.md ---
    @@ -1142,6 +1142,55 @@ Apart from these, the following properties are also 
available, and may be useful
     </tr>
     </table>
     
    +#### Dynamic allocation
    +<table class="table">
    +<tr><th>Property Name</th><th>Default</th><th>Meaning</th></tr>
    +<tr>
    +  <td><code>spark.dynamicAllocation.enabled</code></td>
    +  <td>false</td>
    +  <td>
    +    Enabling dynamic resource allocation.
    --- End diff --
    
    Can you add more explanation of what dynamic resource allocation is here?  
As a user unfamiliar with the feature, this description doesn't tell me enough 
to know whether I want to turn it on.


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