GitHub user mengxr opened a pull request:
https://github.com/apache/spark/pull/3010
[SPARK-4148][PySpark] fix seed distribution and add some tests for
rdd.sample
The current way of seed distribution makes the sequences sampled from
partition i and i+1 offset by 1.
~~~
In [14]: import random
In [15]: r1 = random.Random(10)
In [16]: r1.randint(0, 1)
Out[16]: 1
In [17]: r1.random()
Out[17]: 0.4288890546751146
In [18]: r1.random()
Out[18]: 0.5780913011344704
In [19]: r2 = random.Random(10)
In [20]: r2.randint(0, 1)
Out[20]: 1
In [21]: r2.randint(0, 1)
Out[21]: 0
In [22]: r2.random()
Out[22]: 0.5780913011344704
~~~
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/mengxr/spark SPARK-4148
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3010.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 #3010
----
commit c1bacd9f46fe5559d4affa74dd986c79cced1611
Author: Xiangrui Meng <[email protected]>
Date: 2014-10-30T03:22:13Z
fix seed distribution and add some tests for rdd.sample
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