# pylint: skip-file from __future__ import absolute_import from collections import defaultdict from random import randint, sample import pytest from kafka.structs import TopicPartition from kafka.coordinator.assignors.range import RangePartitionAssignor from kafka.coordinator.assignors.roundrobin import RoundRobinPartitionAssignor from kafka.coordinator.assignors.sticky.sticky_assignor import StickyPartitionAssignor, StickyAssignorUserDataV1 from kafka.coordinator.protocol import ConsumerProtocolMemberAssignment, ConsumerProtocolMemberMetadata import six @pytest.fixture(autouse=True) def reset_sticky_assignor(): yield StickyPartitionAssignor.member_assignment = None StickyPartitionAssignor.generation = -1 def create_cluster(mocker, topics, topics_partitions=None, topic_partitions_lambda=None): cluster = mocker.MagicMock() cluster.topics.return_value = topics if topics_partitions is not None: cluster.partitions_for_topic.return_value = topics_partitions if topic_partitions_lambda is not None: cluster.partitions_for_topic.side_effect = topic_partitions_lambda return cluster def test_assignor_roundrobin(mocker): assignor = RoundRobinPartitionAssignor member_metadata = { 'C0': assignor.metadata({'t0', 't1'}), 'C1': assignor.metadata({'t0', 't1'}), } cluster = create_cluster(mocker, {'t0', 't1'}, topics_partitions={0, 1, 2}) ret = assignor.assign(cluster, member_metadata) expected = { 'C0': ConsumerProtocolMemberAssignment( assignor.version, [('t0', [0, 2]), ('t1', [1])], b''), 'C1': ConsumerProtocolMemberAssignment( assignor.version, [('t0', [1]), ('t1', [0, 2])], b'') } assert ret == expected assert set(ret) == set(expected) for member in ret: assert ret[member].encode() == expected[member].encode() def test_assignor_range(mocker): assignor = RangePartitionAssignor member_metadata = { 'C0': assignor.metadata({'t0', 't1'}), 'C1': assignor.metadata({'t0', 't1'}), } cluster = create_cluster(mocker, {'t0', 't1'}, topics_partitions={0, 1, 2}) ret = assignor.assign(cluster, member_metadata) expected = { 'C0': ConsumerProtocolMemberAssignment( assignor.version, [('t0', [0, 1]), ('t1', [0, 1])], b''), 'C1': ConsumerProtocolMemberAssignment( assignor.version, [('t0', [2]), ('t1', [2])], b'') } assert ret == expected assert set(ret) == set(expected) for member in ret: assert ret[member].encode() == expected[member].encode() def test_sticky_assignor1(mocker): """ Given: there are three consumers C0, C1, C2, four topics t0, t1, t2, t3, and each topic has 2 partitions, resulting in partitions t0p0, t0p1, t1p0, t1p1, t2p0, t2p1, t3p0, t3p1. Each consumer is subscribed to all three topics. Then: perform fresh assignment Expected: the assignment is - C0: [t0p0, t1p1, t3p0] - C1: [t0p1, t2p0, t3p1] - C2: [t1p0, t2p1] Then: remove C1 consumer and perform the reassignment Expected: the new assignment is - C0 [t0p0, t1p1, t2p0, t3p0] - C2 [t0p1, t1p0, t2p1, t3p1] """ cluster = create_cluster(mocker, topics={'t0', 't1', 't2', 't3'}, topics_partitions={0, 1}) subscriptions = { 'C0': {'t0', 't1', 't2', 't3'}, 'C1': {'t0', 't1', 't2', 't3'}, 'C2': {'t0', 't1', 't2', 't3'}, } member_metadata = make_member_metadata(subscriptions) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C0': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t0', [0]), ('t1', [1]), ('t3', [0])], b''), 'C1': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t0', [1]), ('t2', [0]), ('t3', [1])], b''), 'C2': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t1', [0]), ('t2', [1])], b''), } assert_assignment(sticky_assignment, expected_assignment) del subscriptions['C1'] member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata(topics, sticky_assignment[member].partitions()) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C0': ConsumerProtocolMemberAssignment( StickyPartitionAssignor.version, [('t0', [0]), ('t1', [1]), ('t2', [0]), ('t3', [0])], b'' ), 'C2': ConsumerProtocolMemberAssignment( StickyPartitionAssignor.version, [('t0', [1]), ('t1', [0]), ('t2', [1]), ('t3', [1])], b'' ), } assert_assignment(sticky_assignment, expected_assignment) def test_sticky_assignor2(mocker): """ Given: there are three consumers C0, C1, C2, and three topics t0, t1, t2, with 1, 2, and 3 partitions respectively. Therefore, the partitions are t0p0, t1p0, t1p1, t2p0, t2p1, t2p2. C0 is subscribed to t0; C1 is subscribed to t0, t1; and C2 is subscribed to t0, t1, t2. Then: perform the assignment Expected: the assignment is - C0 [t0p0] - C1 [t1p0, t1p1] - C2 [t2p0, t2p1, t2p2] Then: remove C0 and perform the assignment Expected: the assignment is - C1 [t0p0, t1p0, t1p1] - C2 [t2p0, t2p1, t2p2] """ partitions = {'t0': {0}, 't1': {0, 1}, 't2': {0, 1, 2}} cluster = create_cluster(mocker, topics={'t0', 't1', 't2'}, topic_partitions_lambda=lambda t: partitions[t]) subscriptions = { 'C0': {'t0'}, 'C1': {'t0', 't1'}, 'C2': {'t0', 't1', 't2'}, } member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata(topics, []) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C0': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t0', [0])], b''), 'C1': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t1', [0, 1])], b''), 'C2': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t2', [0, 1, 2])], b''), } assert_assignment(sticky_assignment, expected_assignment) del subscriptions['C0'] member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata(topics, sticky_assignment[member].partitions()) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C1': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t0', [0]), ('t1', [0, 1])], b''), 'C2': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t2', [0, 1, 2])], b''), } assert_assignment(sticky_assignment, expected_assignment) def test_sticky_one_consumer_no_topic(mocker): cluster = create_cluster(mocker, topics={}, topics_partitions={}) subscriptions = { 'C': set(), } member_metadata = make_member_metadata(subscriptions) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [], b''), } assert_assignment(sticky_assignment, expected_assignment) def test_sticky_one_consumer_nonexisting_topic(mocker): cluster = create_cluster(mocker, topics={}, topics_partitions={}) subscriptions = { 'C': {'t'}, } member_metadata = make_member_metadata(subscriptions) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [], b''), } assert_assignment(sticky_assignment, expected_assignment) def test_sticky_one_consumer_one_topic(mocker): cluster = create_cluster(mocker, topics={'t'}, topics_partitions={0, 1, 2}) subscriptions = { 'C': {'t'}, } member_metadata = make_member_metadata(subscriptions) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t', [0, 1, 2])], b''), } assert_assignment(sticky_assignment, expected_assignment) def test_sticky_should_only_assign_partitions_from_subscribed_topics(mocker): cluster = create_cluster(mocker, topics={'t', 'other-t'}, topics_partitions={0, 1, 2}) subscriptions = { 'C': {'t'}, } member_metadata = make_member_metadata(subscriptions) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t', [0, 1, 2])], b''), } assert_assignment(sticky_assignment, expected_assignment) def test_sticky_one_consumer_multiple_topics(mocker): cluster = create_cluster(mocker, topics={'t1', 't2'}, topics_partitions={0, 1, 2}) subscriptions = { 'C': {'t1', 't2'}, } member_metadata = make_member_metadata(subscriptions) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t1', [0, 1, 2]), ('t2', [0, 1, 2])], b''), } assert_assignment(sticky_assignment, expected_assignment) def test_sticky_two_consumers_one_topic_one_partition(mocker): cluster = create_cluster(mocker, topics={'t'}, topics_partitions={0}) subscriptions = { 'C1': {'t'}, 'C2': {'t'}, } member_metadata = make_member_metadata(subscriptions) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C1': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t', [0])], b''), 'C2': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [], b''), } assert_assignment(sticky_assignment, expected_assignment) def test_sticky_two_consumers_one_topic_two_partitions(mocker): cluster = create_cluster(mocker, topics={'t'}, topics_partitions={0, 1}) subscriptions = { 'C1': {'t'}, 'C2': {'t'}, } member_metadata = make_member_metadata(subscriptions) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C1': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t', [0])], b''), 'C2': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t', [1])], b''), } assert_assignment(sticky_assignment, expected_assignment) def test_sticky_multiple_consumers_mixed_topic_subscriptions(mocker): partitions = {'t1': {0, 1, 2}, 't2': {0, 1}} cluster = create_cluster(mocker, topics={'t1', 't2'}, topic_partitions_lambda=lambda t: partitions[t]) subscriptions = { 'C1': {'t1'}, 'C2': {'t1', 't2'}, 'C3': {'t1'}, } member_metadata = make_member_metadata(subscriptions) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C1': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t1', [0, 2])], b''), 'C2': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t2', [0, 1])], b''), 'C3': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t1', [1])], b''), } assert_assignment(sticky_assignment, expected_assignment) def test_sticky_add_remove_consumer_one_topic(mocker): cluster = create_cluster(mocker, topics={'t'}, topics_partitions={0, 1, 2}) subscriptions = { 'C1': {'t'}, } member_metadata = make_member_metadata(subscriptions) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C1': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t', [0, 1, 2])], b''), } assert_assignment(assignment, expected_assignment) subscriptions = { 'C1': {'t'}, 'C2': {'t'}, } member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata( topics, assignment[member].partitions() if member in assignment else [] ) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) subscriptions = { 'C2': {'t'}, } member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata(topics, assignment[member].partitions()) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) assert len(assignment['C2'].assignment[0][1]) == 3 def test_sticky_add_remove_topic_two_consumers(mocker): cluster = create_cluster(mocker, topics={'t1', 't2'}, topics_partitions={0, 1, 2}) subscriptions = { 'C1': {'t1'}, 'C2': {'t1'}, } member_metadata = make_member_metadata(subscriptions) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C1': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t1', [0, 2])], b''), 'C2': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t1', [1])], b''), } assert_assignment(sticky_assignment, expected_assignment) subscriptions = { 'C1': {'t1', 't2'}, 'C2': {'t1', 't2'}, } member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata(topics, sticky_assignment[member].partitions()) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C1': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t1', [0, 2]), ('t2', [1])], b''), 'C2': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t1', [1]), ('t2', [0, 2])], b''), } assert_assignment(sticky_assignment, expected_assignment) subscriptions = { 'C1': {'t2'}, 'C2': {'t2'}, } member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata(topics, sticky_assignment[member].partitions()) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C1': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t2', [1])], b''), 'C2': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t2', [0, 2])], b''), } assert_assignment(sticky_assignment, expected_assignment) def test_sticky_reassignment_after_one_consumer_leaves(mocker): partitions = dict([('t{}'.format(i), set(range(i))) for i in range(1, 20)]) cluster = create_cluster( mocker, topics=set(['t{}'.format(i) for i in range(1, 20)]), topic_partitions_lambda=lambda t: partitions[t] ) subscriptions = {} for i in range(1, 20): topics = set() for j in range(1, i + 1): topics.add('t{}'.format(j)) subscriptions['C{}'.format(i)] = topics member_metadata = make_member_metadata(subscriptions) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) del subscriptions['C10'] member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata(topics, assignment[member].partitions()) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) assert StickyPartitionAssignor._latest_partition_movements.are_sticky() def test_sticky_reassignment_after_one_consumer_added(mocker): cluster = create_cluster(mocker, topics={'t'}, topics_partitions=set(range(20))) subscriptions = defaultdict(set) for i in range(1, 10): subscriptions['C{}'.format(i)] = {'t'} member_metadata = make_member_metadata(subscriptions) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) subscriptions['C10'] = {'t'} member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata( topics, assignment[member].partitions() if member in assignment else [] ) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) assert StickyPartitionAssignor._latest_partition_movements.are_sticky() def test_sticky_same_subscriptions(mocker): partitions = dict([('t{}'.format(i), set(range(i))) for i in range(1, 15)]) cluster = create_cluster( mocker, topics=set(['t{}'.format(i) for i in range(1, 15)]), topic_partitions_lambda=lambda t: partitions[t] ) subscriptions = defaultdict(set) for i in range(1, 9): for j in range(1, len(six.viewkeys(partitions)) + 1): subscriptions['C{}'.format(i)].add('t{}'.format(j)) member_metadata = make_member_metadata(subscriptions) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) del subscriptions['C5'] member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata(topics, assignment[member].partitions()) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) assert StickyPartitionAssignor._latest_partition_movements.are_sticky() def test_sticky_large_assignment_with_multiple_consumers_leaving(mocker): n_topics = 40 n_consumers = 200 all_topics = set(['t{}'.format(i) for i in range(1, n_topics + 1)]) partitions = dict([(t, set(range(1, randint(0, 10) + 1))) for t in all_topics]) cluster = create_cluster(mocker, topics=all_topics, topic_partitions_lambda=lambda t: partitions[t]) subscriptions = defaultdict(set) for i in range(1, n_consumers + 1): for j in range(0, randint(1, 20)): subscriptions['C{}'.format(i)].add('t{}'.format(randint(1, n_topics))) member_metadata = make_member_metadata(subscriptions) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata(topics, assignment[member].partitions()) for i in range(50): member = 'C{}'.format(randint(1, n_consumers)) if member in subscriptions: del subscriptions[member] del member_metadata[member] assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) assert StickyPartitionAssignor._latest_partition_movements.are_sticky() def test_new_subscription(mocker): cluster = create_cluster(mocker, topics={'t1', 't2', 't3', 't4'}, topics_partitions={0}) subscriptions = defaultdict(set) for i in range(3): for j in range(i, 3 * i - 2 + 1): subscriptions['C{}'.format(i)].add('t{}'.format(j)) member_metadata = make_member_metadata(subscriptions) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) subscriptions['C0'].add('t1') member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata(topics, []) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) assert StickyPartitionAssignor._latest_partition_movements.are_sticky() def test_move_existing_assignments(mocker): cluster = create_cluster(mocker, topics={'t1', 't2', 't3', 't4', 't5', 't6'}, topics_partitions={0}) subscriptions = { 'C1': {'t1', 't2'}, 'C2': {'t1', 't2', 't3', 't4'}, 'C3': {'t2', 't3', 't4', 't5', 't6'}, } member_assignments = { 'C1': [TopicPartition('t1', 0)], 'C2': [TopicPartition('t2', 0), TopicPartition('t3', 0)], 'C3': [TopicPartition('t4', 0), TopicPartition('t5', 0), TopicPartition('t6', 0)], } member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata(topics, member_assignments[member]) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) def test_stickiness(mocker): cluster = create_cluster(mocker, topics={'t'}, topics_partitions={0, 1, 2}) subscriptions = { 'C1': {'t'}, 'C2': {'t'}, 'C3': {'t'}, 'C4': {'t'}, } member_metadata = make_member_metadata(subscriptions) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) partitions_assigned = {} for consumer, consumer_assignment in six.iteritems(assignment): assert ( len(consumer_assignment.partitions()) <= 1 ), 'Consumer {} is assigned more topic partitions than expected.'.format(consumer) if len(consumer_assignment.partitions()) == 1: partitions_assigned[consumer] = consumer_assignment.partitions()[0] # removing the potential group leader del subscriptions['C1'] member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata(topics, assignment[member].partitions()) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) assert StickyPartitionAssignor._latest_partition_movements.are_sticky() for consumer, consumer_assignment in six.iteritems(assignment): assert ( len(consumer_assignment.partitions()) <= 1 ), 'Consumer {} is assigned more topic partitions than expected.'.format(consumer) assert ( consumer not in partitions_assigned or partitions_assigned[consumer] in consumer_assignment.partitions() ), 'Stickiness was not honored for consumer {}'.format(consumer) def test_assignment_updated_for_deleted_topic(mocker): def topic_partitions(topic): if topic == 't1': return {0} if topic == 't3': return set(range(100)) cluster = create_cluster(mocker, topics={'t1', 't3'}, topic_partitions_lambda=topic_partitions) subscriptions = { 'C': {'t1', 't2', 't3'}, } member_metadata = make_member_metadata(subscriptions) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t1', [0]), ('t3', list(range(100)))], b''), } assert_assignment(sticky_assignment, expected_assignment) def test_no_exceptions_when_only_subscribed_topic_is_deleted(mocker): cluster = create_cluster(mocker, topics={'t'}, topics_partitions={0, 1, 2}) subscriptions = { 'C': {'t'}, } member_metadata = make_member_metadata(subscriptions) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [('t', [0, 1, 2])], b''), } assert_assignment(sticky_assignment, expected_assignment) subscriptions = { 'C': {}, } member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata(topics, sticky_assignment[member].partitions()) cluster = create_cluster(mocker, topics={}, topics_partitions={}) sticky_assignment = StickyPartitionAssignor.assign(cluster, member_metadata) expected_assignment = { 'C': ConsumerProtocolMemberAssignment(StickyPartitionAssignor.version, [], b''), } assert_assignment(sticky_assignment, expected_assignment) def test_conflicting_previous_assignments(mocker): cluster = create_cluster(mocker, topics={'t'}, topics_partitions={0, 1}) subscriptions = { 'C1': {'t'}, 'C2': {'t'}, } member_metadata = {} for member, topics in six.iteritems(subscriptions): # assume both C1 and C2 have partition 1 assigned to them in generation 1 member_metadata[member] = build_metadata(topics, [TopicPartition('t', 0), TopicPartition('t', 0)], 1) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) @pytest.mark.parametrize( 'execution_number,n_topics,n_consumers', [(i, randint(10, 20), randint(20, 40)) for i in range(100)] ) def test_reassignment_with_random_subscriptions_and_changes(mocker, execution_number, n_topics, n_consumers): all_topics = sorted(set(['t{}'.format(i) for i in range(1, n_topics + 1)])) partitions = dict([(t, set(range(1, i + 1))) for i, t in enumerate(all_topics)]) cluster = create_cluster(mocker, topics=all_topics, topic_partitions_lambda=lambda t: partitions[t]) subscriptions = defaultdict(set) for i in range(n_consumers): topics_sample = sample(all_topics, randint(1, len(all_topics) - 1)) subscriptions['C{}'.format(i)].update(topics_sample) member_metadata = make_member_metadata(subscriptions) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) subscriptions = defaultdict(set) for i in range(n_consumers): topics_sample = sample(all_topics, randint(1, len(all_topics) - 1)) subscriptions['C{}'.format(i)].update(topics_sample) member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata(topics, assignment[member].partitions()) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance(subscriptions, assignment) assert StickyPartitionAssignor._latest_partition_movements.are_sticky() def test_assignment_with_multiple_generations1(mocker): cluster = create_cluster(mocker, topics={'t'}, topics_partitions={0, 1, 2, 3, 4, 5}) member_metadata = { 'C1': build_metadata({'t'}, []), 'C2': build_metadata({'t'}, []), 'C3': build_metadata({'t'}, []), } assignment1 = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance({'C1': {'t'}, 'C2': {'t'}, 'C3': {'t'}}, assignment1) assert len(assignment1['C1'].assignment[0][1]) == 2 assert len(assignment1['C2'].assignment[0][1]) == 2 assert len(assignment1['C3'].assignment[0][1]) == 2 member_metadata = { 'C1': build_metadata({'t'}, assignment1['C1'].partitions()), 'C2': build_metadata({'t'}, assignment1['C2'].partitions()), } assignment2 = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance({'C1': {'t'}, 'C2': {'t'}}, assignment2) assert len(assignment2['C1'].assignment[0][1]) == 3 assert len(assignment2['C2'].assignment[0][1]) == 3 assert all([partition in assignment2['C1'].assignment[0][1] for partition in assignment1['C1'].assignment[0][1]]) assert all([partition in assignment2['C2'].assignment[0][1] for partition in assignment1['C2'].assignment[0][1]]) assert StickyPartitionAssignor._latest_partition_movements.are_sticky() member_metadata = { 'C2': build_metadata({'t'}, assignment2['C2'].partitions(), 2), 'C3': build_metadata({'t'}, assignment1['C3'].partitions(), 1), } assignment3 = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance({'C2': {'t'}, 'C3': {'t'}}, assignment3) assert len(assignment3['C2'].assignment[0][1]) == 3 assert len(assignment3['C3'].assignment[0][1]) == 3 assert StickyPartitionAssignor._latest_partition_movements.are_sticky() def test_assignment_with_multiple_generations2(mocker): cluster = create_cluster(mocker, topics={'t'}, topics_partitions={0, 1, 2, 3, 4, 5}) member_metadata = { 'C1': build_metadata({'t'}, []), 'C2': build_metadata({'t'}, []), 'C3': build_metadata({'t'}, []), } assignment1 = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance({'C1': {'t'}, 'C2': {'t'}, 'C3': {'t'}}, assignment1) assert len(assignment1['C1'].assignment[0][1]) == 2 assert len(assignment1['C2'].assignment[0][1]) == 2 assert len(assignment1['C3'].assignment[0][1]) == 2 member_metadata = { 'C2': build_metadata({'t'}, assignment1['C2'].partitions(), 1), } assignment2 = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance({'C2': {'t'}}, assignment2) assert len(assignment2['C2'].assignment[0][1]) == 6 assert all([partition in assignment2['C2'].assignment[0][1] for partition in assignment1['C2'].assignment[0][1]]) assert StickyPartitionAssignor._latest_partition_movements.are_sticky() member_metadata = { 'C1': build_metadata({'t'}, assignment1['C1'].partitions(), 1), 'C2': build_metadata({'t'}, assignment2['C2'].partitions(), 2), 'C3': build_metadata({'t'}, assignment1['C3'].partitions(), 1), } assignment3 = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance({'C1': {'t'}, 'C2': {'t'}, 'C3': {'t'}}, assignment3) assert StickyPartitionAssignor._latest_partition_movements.are_sticky() assert set(assignment3['C1'].assignment[0][1]) == set(assignment1['C1'].assignment[0][1]) assert set(assignment3['C2'].assignment[0][1]) == set(assignment1['C2'].assignment[0][1]) assert set(assignment3['C3'].assignment[0][1]) == set(assignment1['C3'].assignment[0][1]) @pytest.mark.parametrize('execution_number', range(50)) def test_assignment_with_conflicting_previous_generations(mocker, execution_number): cluster = create_cluster(mocker, topics={'t'}, topics_partitions={0, 1, 2, 3, 4, 5}) member_assignments = { 'C1': [TopicPartition('t', p) for p in {0, 1, 4}], 'C2': [TopicPartition('t', p) for p in {0, 2, 3}], 'C3': [TopicPartition('t', p) for p in {3, 4, 5}], } member_generations = { 'C1': 1, 'C2': 1, 'C3': 2, } member_metadata = {} for member in six.iterkeys(member_assignments): member_metadata[member] = build_metadata({'t'}, member_assignments[member], member_generations[member]) assignment = StickyPartitionAssignor.assign(cluster, member_metadata) verify_validity_and_balance({'C1': {'t'}, 'C2': {'t'}, 'C3': {'t'}}, assignment) assert StickyPartitionAssignor._latest_partition_movements.are_sticky() def make_member_metadata(subscriptions): member_metadata = {} for member, topics in six.iteritems(subscriptions): member_metadata[member] = build_metadata(topics, []) return member_metadata def build_metadata(topics, member_assignment_partitions, generation=-1): partitions_by_topic = defaultdict(list) for topic_partition in member_assignment_partitions: partitions_by_topic[topic_partition.topic].append(topic_partition.partition) data = StickyAssignorUserDataV1(six.viewitems(partitions_by_topic), generation) user_data = data.encode() return ConsumerProtocolMemberMetadata(StickyPartitionAssignor.version, list(topics), user_data) def assert_assignment(result_assignment, expected_assignment): assert result_assignment == expected_assignment assert set(result_assignment) == set(expected_assignment) for member in result_assignment: assert result_assignment[member].encode() == expected_assignment[member].encode() def verify_validity_and_balance(subscriptions, assignment): """ Verifies that the given assignment is valid with respect to the given subscriptions Validity requirements: - each consumer is subscribed to topics of all partitions assigned to it, and - each partition is assigned to no more than one consumer Balance requirements: - the assignment is fully balanced (the numbers of topic partitions assigned to consumers differ by at most one), or - there is no topic partition that can be moved from one consumer to another with 2+ fewer topic partitions :param subscriptions topic subscriptions of each consumer :param assignment: given assignment for balance check """ assert six.viewkeys(subscriptions) == six.viewkeys(assignment) consumers = sorted(six.viewkeys(assignment)) for i in range(len(consumers)): consumer = consumers[i] partitions = assignment[consumer].partitions() for partition in partitions: assert partition.topic in subscriptions[consumer], ( 'Error: Partition {} is assigned to consumer {}, ' 'but it is not subscribed to topic {}\n' 'Subscriptions: {}\n' 'Assignments: {}'.format(partition, consumers[i], partition.topic, subscriptions, assignment) ) if i == len(consumers) - 1: continue for j in range(i + 1, len(consumers)): other_consumer = consumers[j] other_partitions = assignment[other_consumer].partitions() partitions_intersection = set(partitions).intersection(set(other_partitions)) assert partitions_intersection == set(), ( 'Error: Consumers {} and {} have common partitions ' 'assigned to them: {}\n' 'Subscriptions: {}\n' 'Assignments: {}'.format(consumer, other_consumer, partitions_intersection, subscriptions, assignment) ) if abs(len(partitions) - len(other_partitions)) <= 1: continue assignments_by_topic = group_partitions_by_topic(partitions) other_assignments_by_topic = group_partitions_by_topic(other_partitions) if len(partitions) > len(other_partitions): for topic in six.iterkeys(assignments_by_topic): assert topic not in other_assignments_by_topic, ( 'Error: Some partitions can be moved from {} ({} partitions) ' 'to {} ({} partitions) ' 'to achieve a better balance\n' 'Subscriptions: {}\n' 'Assignments: {}'.format(consumer, len(partitions), other_consumer, len(other_partitions), subscriptions, assignment) ) if len(other_partitions) > len(partitions): for topic in six.iterkeys(other_assignments_by_topic): assert topic not in assignments_by_topic, ( 'Error: Some partitions can be moved from {} ({} partitions) ' 'to {} ({} partitions) ' 'to achieve a better balance\n' 'Subscriptions: {}\n' 'Assignments: {}'.format(other_consumer, len(other_partitions), consumer, len(partitions), subscriptions, assignment) ) def group_partitions_by_topic(partitions): result = defaultdict(set) for p in partitions: result[p.topic].add(p.partition) return result