[
https://issues.apache.org/jira/browse/SPARK-3995?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Xiangrui Meng updated SPARK-3995:
---------------------------------
Assignee: Jeremy Freeman
> [PYSPARK] PySpark's sample methods do not work with NumPy 1.9
> -------------------------------------------------------------
>
> Key: SPARK-3995
> URL: https://issues.apache.org/jira/browse/SPARK-3995
> Project: Spark
> Issue Type: Bug
> Components: PySpark, Spark Core
> Affects Versions: 1.1.0
> Reporter: Jeremy Freeman
> Assignee: Jeremy Freeman
> Priority: Critical
>
> There is a breaking bug in PySpark's sampling methods when run with NumPy
> v1.9. This is the version of NumPy included with the current Anaconda
> distribution (v2.1); this is a popular distribution, and is likely to affect
> many users.
> Steps to reproduce are:
> {code:python}
> foo = sc.parallelize(range(1000),5)
> foo.takeSample(False, 10)
> {code}
> Returns:
> {code}
> PythonException: Traceback (most recent call last):
> File
> "/Users/freemanj11/code/spark-1.1.0-bin-hadoop1/python/pyspark/worker.py",
> line 79, in main
> serializer.dump_stream(func(split_index, iterator), outfile)
> File
> "/Users/freemanj11/code/spark-1.1.0-bin-hadoop1/python/pyspark/serializers.py",
> line 196, in dump_stream
> self.serializer.dump_stream(self._batched(iterator), stream)
> File
> "/Users/freemanj11/code/spark-1.1.0-bin-hadoop1/python/pyspark/serializers.py",
> line 127, in dump_stream
> for obj in iterator:
> File
> "/Users/freemanj11/code/spark-1.1.0-bin-hadoop1/python/pyspark/serializers.py",
> line 185, in _batched
> for item in iterator:
> File
> "/Users/freemanj11/code/spark-1.1.0-bin-hadoop1/python/pyspark/rddsampler.py",
> line 116, in func
> if self.getUniformSample(split) <= self._fraction:
> File
> "/Users/freemanj11/code/spark-1.1.0-bin-hadoop1/python/pyspark/rddsampler.py",
> line 58, in getUniformSample
> self.initRandomGenerator(split)
> File
> "/Users/freemanj11/code/spark-1.1.0-bin-hadoop1/python/pyspark/rddsampler.py",
> line 44, in initRandomGenerator
> self._random = numpy.random.RandomState(self._seed)
> File "mtrand.pyx", line 610, in mtrand.RandomState.__init__
> (numpy/random/mtrand/mtrand.c:7397)
> File "mtrand.pyx", line 646, in mtrand.RandomState.seed
> (numpy/random/mtrand/mtrand.c:7697)
> ValueError: Seed must be between 0 and 4294967295
> {code}
> In PySpark's {{RDDSamplerBase}} class from {{pyspark.rddsampler}} we use:
> {code:python}
> self._seed = seed if seed is not None else random.randint(0, sys.maxint)
> {code}
> In previous versions of NumPy a random seed larger than 2 ** 32 would
> silently get truncated to 2 ** 32. This was fixed in a recent patch
> (https://github.com/numpy/numpy/commit/6b1a1205eac6fe5d162f16155d500765e8bca53c).
> But sampling {{(0, sys.maxint)}} often yields ints larger than 2 ** 32,
> which effectively breaks sampling operations in PySpark (unless the seed is
> set manually).
> I am putting a PR together now (the fix is very simple!).
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org
For additional commands, e-mail: issues-h...@spark.apache.org
