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author | Chen Chao <crazyjvm@gmail.com> | 2014-04-16 09:14:18 -0700 |
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committer | Patrick Wendell <pwendell@gmail.com> | 2014-04-16 09:14:18 -0700 |
commit | 9edd88782e0268439c5ab57400d6a7ab432fc269 (patch) | |
tree | 1a5c8b05925aec2e3f7f6953b54cc49ee9bfae05 /docs | |
parent | fec462c15321fa138d9654d64cc08468b6ab5ad1 (diff) | |
download | spark-9edd88782e0268439c5ab57400d6a7ab432fc269.tar.gz spark-9edd88782e0268439c5ab57400d6a7ab432fc269.tar.bz2 spark-9edd88782e0268439c5ab57400d6a7ab432fc269.zip |
update spark.default.parallelism
actually, the value 8 is only valid in mesos fine-grained mode :
<code>
override def defaultParallelism() = sc.conf.getInt("spark.default.parallelism", 8)
</code>
while in coarse-grained model including mesos coares-grained, the value of the property depending on core numbers!
<code>
override def defaultParallelism(): Int = {
conf.getInt("spark.default.parallelism", math.max(totalCoreCount.get(), 2))
}
</code>
Author: Chen Chao <crazyjvm@gmail.com>
Closes #389 from CrazyJvm/patch-2 and squashes the following commits:
84a7fe4 [Chen Chao] miss </li> at the end of every single line
04a9796 [Chen Chao] change format
ee0fae0 [Chen Chao] update spark.default.parallelism
Diffstat (limited to 'docs')
-rw-r--r-- | docs/configuration.md | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/docs/configuration.md b/docs/configuration.md index f3bfd036f4..a3029837ff 100644 --- a/docs/configuration.md +++ b/docs/configuration.md @@ -96,7 +96,13 @@ Apart from these, the following properties are also available, and may be useful <tr><th>Property Name</th><th>Default</th><th>Meaning</th></tr> <tr> <td>spark.default.parallelism</td> - <td>8</td> + <td> + <ul> + <li>Mesos fine grained mode: 8</li> + <li>Local mode: core number of the local machine</li> + <li>Others: total core number of all executor nodes or 2, whichever is larger</li> + </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. |