Github user redsanket commented on a diff in the pull request:
https://github.com/apache/spark/pull/10838#discussion_r50208257
--- Diff: docs/configuration.md ---
@@ -392,6 +392,17 @@ Apart from these, the following properties are also
available, and may be useful
</td>
</tr>
<tr>
+ <td><code>spark.reducer.maxReqsInFlight</code></td>
+ <td>20</td>
+ <td>
+ spark.reducer.maxMbInFlight puts a bound on the in flight data in
terms of size.
--- End diff --
The full description describes about the configuration if you can take a
look at it. The first line just explains why the maxMbInFlight is insufficient
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