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

    https://github.com/apache/spark/pull/20857#discussion_r179916799
  
    --- Diff: docs/configuration.md ---
    @@ -2288,6 +2288,13 @@ showDF(properties, numRows = 200, truncate = FALSE)
         on the receivers.
       </td>
     </tr>
    +<tr>
    +  <td><code>spark.streaming.concurrentJobs</code></td>
    +  <td>1</td>
    +  <td>
    +    The number of concurrent jobs.This parameter directly affects the 
number of threads in the jobExecutor thread pool.
    --- End diff --
    
    I think we don't document this on purpose, as its behavior is hard to 
understand. This description doesn't really help a caller, anyway.


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