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from __future__ import absolute_import
import pytest
from kafka.partitioner import DefaultPartitioner, Murmur2Partitioner, RoundRobinPartitioner
from kafka.partitioner.hashed import murmur2
def test_default_partitioner():
partitioner = DefaultPartitioner()
all_partitions = available = list(range(100))
# partitioner should return the same partition for the same key
p1 = partitioner(b'foo', all_partitions, available)
p2 = partitioner(b'foo', all_partitions, available)
assert p1 == p2
assert p1 in all_partitions
# when key is None, choose one of available partitions
assert partitioner(None, all_partitions, [123]) == 123
# with fallback to all_partitions
assert partitioner(None, all_partitions, []) in all_partitions
def test_roundrobin_partitioner():
partitioner = RoundRobinPartitioner()
all_partitions = available = list(range(100))
# partitioner should cycle between partitions
i = 0
max_partition = all_partitions[len(all_partitions) - 1]
while i <= max_partition:
assert i == partitioner(None, all_partitions, available)
i += 1
i = 0
while i <= int(max_partition / 2):
assert i == partitioner(None, all_partitions, available)
i += 1
# test dynamic partition re-assignment
available = available[:-25]
while i <= max(available):
assert i == partitioner(None, all_partitions, available)
i += 1
all_partitions = list(range(200))
available = all_partitions
max_partition = all_partitions[len(all_partitions) - 1]
while i <= max_partition:
assert i == partitioner(None, all_partitions, available)
i += 1
@pytest.mark.parametrize("bytes_payload,partition_number", [
(b'', 681), (b'a', 524), (b'ab', 434), (b'abc', 107), (b'123456789', 566),
(b'\x00 ', 742)
])
def test_murmur2_java_compatibility(bytes_payload, partition_number):
p = Murmur2Partitioner(range(1000))
# compare with output from Kafka's org.apache.kafka.clients.producer.Partitioner
assert p.partition(bytes_payload) == partition_number
def test_murmur2_not_ascii():
# Verify no regression of murmur2() bug encoding py2 bytes that don't ascii encode
murmur2(b'\xa4')
murmur2(b'\x81' * 1000)
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