GitHub user CrazyJvm opened a pull request:
https://github.com/apache/spark/pull/389
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>
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/CrazyJvm/spark patch-2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/389.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #389
----
commit ee0fae00ad0294dedca6a78ed05b97ef0ddcc211
Author: Chen Chao <[email protected]>
Date: 2014-04-11T06:54:58Z
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>
----
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