Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/3107#discussion_r20060453
--- Diff: docs/configuration.md ---
@@ -556,6 +556,9 @@ Apart from these, the following properties are also
available, and may be useful
<tr>
<td><code>spark.default.parallelism</code></td>
<td>
+ For distributed shuffle operations like <code>reduceByKey</code> and
<code>join</code>, the
+ largest number of partitions in parent RDD. For operations like
<code>parallelize</code> with
--- End diff --
Is this just "the number of partitions in the parent RDD" (why largest?)
Doesn't the parentRDD have the a fixed number of partitions? Or is this a
maximum across all parents...?
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