GitHub user jbencook opened a pull request:
https://github.com/apache/spark/pull/3764
[SPARK-4860][pyspark][sql] speeding up `sample()` and `takeSample()`
This PR modifies the python `SchemaRDD` to use `sample()` and
`takeSample()` from Scala instead of the slower python implementations from
`rdd.py`. This is worthwhile because the `Row`'s are already serialized as Java
objects.
In order to use the faster `takeSample()`, a `takeSampleToPython()` method
was implemented in `SchemaRDD.scala` following the pattern of
`collectToPython()`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jbencook/spark master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3764.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 #3764
----
commit 020cbdf8814d25121a909b634f908dc8c41bd739
Author: jbencook <[email protected]>
Date: 2014-12-22T16:40:49Z
[SPARK-4860][pyspark][sql] using Scala implementations of `sample()` and
`takeSample()`
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