From c6f4e704214097f17d2d6abfbfef4bb208e4339f Mon Sep 17 00:00:00 2001
From: Sandy Ryza <sandy@cloudera.com>
Date: Mon, 10 Nov 2014 12:40:41 -0800
Subject: [PATCH] SPARK-4230. Doc for spark.default.parallelism is incorrect
Author: Sandy Ryza <sandy@cloudera.com>
Closes #3107 from sryza/sandy-spark-4230 and squashes the following commits:
37a1d19 [Sandy Ryza] Clear up a couple things
34d53de [Sandy Ryza] SPARK-4230. Doc for spark.default.parallelism is incorrect
---
docs/configuration.md | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/docs/configuration.md b/docs/configuration.md
index 0f9eb81f6e..f0b396e21f 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -562,6 +562,9 @@ 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 a parent RDD. For operations like <code>parallelize</code>
+ with no parent RDDs, it depends on the cluster manager:
<ul>
<li>Local mode: number of cores on the local machine</li>
<li>Mesos fine grained mode: 8</li>
@@ -569,8 +572,8 @@ 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 partitions in RDDs returned by transformations like <code>join</code>,
+ <code>reduceByKey</code>, and <code>parallelize</code> when not set by user.
</td>
</tr>
<tr>
--
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