Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/3107#discussion_r20063448
--- Diff: docs/configuration.md ---
@@ -563,8 +566,8 @@ Apart from these, the following properties are also
available, and may be useful
</ul>
</td>
<td>
- Default number of tasks to use across the cluster for distributed
shuffle operations
- (<code>groupByKey</code>, <code>reduceByKey</code>, etc) when not set
by user.
+ Default number of output partitions for operations like
<code>join</code>,
--- End diff --
Ah I see - what about "Default number of partitions in RDD's returned by
join, reduceByKey..."
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