tvalentyn commented on a change in pull request #11092: [BEAM-9085] Fix
performance regression in SyntheticSource
URL: https://github.com/apache/beam/pull/11092#discussion_r405711175
##########
File path: sdks/python/apache_beam/testing/synthetic_pipeline.py
##########
@@ -61,6 +65,35 @@
np = None
+class _Random(Random):
+ """A subclass of `random.Random` from the Python Standard Library that
+ provides a method returning random bytes of arbitrary length.
+ """
+
+ # `numpy.random.RandomState` does not provide `random()` method, we keep this
+ # for compatibility reasons.
+ random_sample = Random.random
+
+ def bytes(self, length):
+ """Returns random bytes.
+
+ Args:
+ length (int): Number of random bytes.
+ """
+ n = length // 8 + 1
+ # pylint: disable=map-builtin-not-iterating
+ return struct.pack(
+ '{}Q'.format(n), *map(self.getrandbits, itertools.repeat(64,
+ n)))[:length]
+
+
+Generator = _Random
+
+# TODO: Remove this when Beam drops Python 2.
Review comment:
yes - https://issues.apache.org/jira/browse/BEAM-7372
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