Github user sryza commented on a diff in the pull request:
https://github.com/apache/spark/pull/3107#discussion_r20060629
--- 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 --
I was worried "the number of partitions of the largest parent RDD" could be
construed as "the number of partitions in the parent RDD containing the most
data".
Do you think "the largest number of partitions in _a_ parent RDD" or "the
largest number of partitions in one of the operation's input RDDs" would be
more clear?
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