Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/18562#discussion_r126264346
--- Diff: docs/structured-streaming-programming-guide.md ---
@@ -547,6 +549,19 @@ Here are the details of all the sources in Spark.
<td></td>
</tr>
<tr>
+ <td><b>Rate Source</b></td>
+ <td>
+ <code>rowsPerSecond</code> (e.g. 100, default: 1): How many rows
should be generated per second.<br/><br/>
+ <code>rampUpTime</code> (e.g. 5s, default: 0s): How long to ramp
up before the generating speed becomes <code>rowsPerSecond</code>. Using finer
granularities than seconds will be truncated to integer seconds. <br/><br/>
+ <code>numPartitions</code> (e.g. 10, default: Spark's default
parallelism): The partition number for the generated rows. <br/><br/>
+
+ The source will try its best to reach <code>rowsPerSecond</code>,
but the query may be resource constrained, and <code>numPartitions</code> can
be tweaked to help reach the desired speed.
+ </td>
+ <td>No</td>
--- End diff --
"No" -> "Yes".
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