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jepsen-python/src/blockade_random_partitions-rabbitmq-test.py
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''' | |
simulates blockade's --random partitioning. | |
@see http://blockade.readthedocs.io/en/latest/commands.html#partition | |
''' | |
from rabbitmq_test import test | |
import random | |
from blockade.errors import BlockadeError | |
import logging | |
def random_partition(containers): | |
''' | |
taken from https://github.com/dcm-oss/blockade/blob/master/blockade/core.py#L411 | |
:param containers: | |
:return: | |
@see https://github.com/dcm-oss/blockade/blob/master/blockade/core.py#L411 | |
''' | |
if not containers: | |
return [] | |
num_containers = len(containers) | |
num_partitions = random.randint(2, num_containers) | |
pick = lambda: containers.pop(random.randint(0, len(containers) - 1)) | |
# pick at least one container for each partition | |
partitions = [[pick()] for _ in xrange(num_partitions)] | |
# distribute the rest of the containers among the partitions | |
for _ in xrange(len(containers)): | |
random_partition = random.randint(0, num_partitions - 1) | |
partitions[random_partition].append(pick()) | |
return partitions | |
def blockade_random_partition_strategy(nodes, nemesis): | |
for num_att in range(5): | |
partitions = [','.join(p) for p in random_partition(nodes[:])] | |
if len(partitions) > 0: | |
break | |
if not partitions: | |
raise Exception("failed to create a partition for %s" % str(nodes)) | |
try: | |
nemesis.partition(partitions) | |
nemesis.status() | |
except BlockadeError as e: | |
logging.error('failed to create partition for %s', str(nodes)) | |
logging.exception(e) | |
if __name__ == '__main__': | |
test(blockade_random_partition_strategy) |