Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/15218#discussion_r83560546
--- Diff: docs/configuration.md ---
@@ -1334,6 +1334,17 @@ Apart from these, the following properties are also
available, and may be useful
Should be greater than or equal to 1. Number of allowed retries = this
value - 1.
</td>
</tr>
+<tr>
+ <td><code>spark.task.assigner</code></td>
+ <td>org.apache.spark.scheduler.RoundRobinAssigner</td>
--- End diff --
In Spark SQL side, we did a similar thing for data source. You can check
the code in the function
[lookupDataSource](https://github.com/apache/spark/blob/6ce1b675ee9fc9a6034439c3ca00441f9f172f84/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala#L122).
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