rreddy-22 commented on code in PR #13443: URL: https://github.com/apache/kafka/pull/13443#discussion_r1179556594
########## group-coordinator/src/test/java/org/apache/kafka/coordinator/group/assignor/RangeAssignorTest.java: ########## @@ -0,0 +1,574 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.kafka.coordinator.group.assignor; + +import org.apache.kafka.common.Uuid; + +import org.junit.jupiter.api.Test; + +import java.util.Arrays; +import java.util.Collection; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Map; +import java.util.Optional; +import java.util.Set; + +import static org.junit.jupiter.api.Assertions.assertEquals; +import static org.junit.jupiter.api.Assertions.assertNull; +import static org.junit.jupiter.api.Assertions.assertTrue; + +public class RangeAssignorTest { + private final RangeAssignor assignor = new RangeAssignor(); + private final Uuid topic1Uuid = Uuid.randomUuid(); + private final Uuid topic2Uuid = Uuid.randomUuid(); + private final Uuid topic3Uuid = Uuid.randomUuid(); + private final String consumerA = "A"; + private final String consumerB = "B"; + private final String consumerC = "C"; + + @Test + public void testOneConsumerNoTopic() { + Map<Uuid, AssignmentTopicMetadata> topics = Collections.singletonMap(topic1Uuid, new AssignmentTopicMetadata(3)); + Map<String, AssignmentMemberSpec> members = Collections.singletonMap( + consumerA, + new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Collections.emptyList(), + Collections.emptyMap()) + ); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment groupAssignment = assignor.assign(assignmentSpec); + + assertTrue(groupAssignment.members().isEmpty()); + } + + @Test + public void testOneConsumerNonExistentTopic() { + Map<Uuid, AssignmentTopicMetadata> topics = Collections.singletonMap(topic1Uuid, new AssignmentTopicMetadata(3)); + Map<String, AssignmentMemberSpec> members = Collections.singletonMap( + consumerA, + new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Collections.singletonList(topic2Uuid), + Collections.emptyMap()) + ); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment groupAssignment = assignor.assign(assignmentSpec); + + assertTrue(groupAssignment.members().isEmpty()); + } + + @Test + public void testFirstAssignmentTwoConsumersTwoTopicsSameSubscriptions() { + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic3Uuid, new AssignmentTopicMetadata(2)); + + Map<String, AssignmentMemberSpec> members = new HashMap<>(); + // Initial Subscriptions are: A -> T1, T3 | B -> T1, T3 + + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic3Uuid), + Collections.emptyMap()) + ); + + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic3Uuid), + Collections.emptyMap()) + ); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<Uuid, Set<Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + mkAssignment(expectedAssignment, topic1Uuid, Arrays.asList(0, 1)); + mkAssignment(expectedAssignment, topic1Uuid, Collections.singleton(2)); + // Topic 3 Partitions Assignment + mkAssignment(expectedAssignment, topic3Uuid, Collections.singleton(0)); + mkAssignment(expectedAssignment, topic3Uuid, Collections.singleton(1)); + + assertAssignment(expectedAssignment, computedAssignment); + } + + @Test + public void testFirstAssignmentThreeConsumersThreeTopicsDifferentSubscriptions() { + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic2Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic3Uuid, new AssignmentTopicMetadata(2)); + + Map<String, AssignmentMemberSpec> members = new HashMap<>(); + // Initial Subscriptions: A -> T1, T2 | B -> T3 | C -> T2, T3 + + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + Collections.emptyMap()) + ); + + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Collections.singletonList(topic3Uuid), + Collections.emptyMap()) + ); + + members.put(consumerC, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic2Uuid, topic3Uuid), + Collections.emptyMap()) + ); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<Uuid, Set<Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + mkAssignment(expectedAssignment, topic1Uuid, Arrays.asList(0, 1, 2)); + // Topic 2 Partitions Assignment + mkAssignment(expectedAssignment, topic2Uuid, Arrays.asList(0, 1)); + mkAssignment(expectedAssignment, topic2Uuid, Collections.singleton(2)); + // Topic 3 Partitions Assignment + mkAssignment(expectedAssignment, topic3Uuid, Collections.singleton(0)); + mkAssignment(expectedAssignment, topic3Uuid, Collections.singleton(1)); + + assertAssignment(expectedAssignment, computedAssignment); + } + + @Test + public void testFirstAssignmentNumConsumersGreaterThanNumPartitions() { + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic3Uuid, new AssignmentTopicMetadata(2)); + + Map<String, AssignmentMemberSpec> members = new HashMap<>(); + // Initial Subscriptions: A -> T1, T3 | B -> T1, T3 | C -> T1, T3 + + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic3Uuid), + Collections.emptyMap()) + ); + + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic3Uuid), + Collections.emptyMap()) + ); + + members.put(consumerC, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic3Uuid), + Collections.emptyMap()) + ); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<Uuid, Set<Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 3 has 2 partitions but three consumers subscribed to it - one of them will not get a partition. + // Topic 1 Partitions Assignment + mkAssignment(expectedAssignment, topic1Uuid, Collections.singleton(0)); + mkAssignment(expectedAssignment, topic1Uuid, Collections.singleton(1)); + mkAssignment(expectedAssignment, topic1Uuid, Collections.singleton(2)); + // Topic 2 Partitions Assignment + mkAssignment(expectedAssignment, topic3Uuid, Collections.singleton(0)); + mkAssignment(expectedAssignment, topic3Uuid, Collections.singleton(1)); + + assertAssignment(expectedAssignment, computedAssignment); + } + + @Test + public void testReassignmentNumConsumersGreaterThanNumPartitionsWhenOneConsumerAdded() { + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(2)); + topics.put(topic2Uuid, new AssignmentTopicMetadata(2)); + + Map<String, AssignmentMemberSpec> members = new HashMap<>(); + // Initial Subscriptions: A -> T1, T2 | B -> T1, T2 | C -> T1, T2 + + Map<Uuid, Set<Integer>> currentAssignmentForA = new HashMap<>(); + currentAssignmentForA.put(topic1Uuid, Collections.singleton(0)); + currentAssignmentForA.put(topic2Uuid, Collections.singleton(0)); + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForA) + ); + + Map<Uuid, Set<Integer>> currentAssignmentForB = new HashMap<>(); + currentAssignmentForB.put(topic1Uuid, Collections.singleton(1)); + currentAssignmentForB.put(topic2Uuid, Collections.singleton(1)); + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForB) + ); + + // Add a new consumer to trigger a re-assignment + members.put(consumerC, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + Collections.emptyMap()) + ); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<Uuid, Set<Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + mkAssignment(expectedAssignment, topic1Uuid, Collections.singleton(0)); + mkAssignment(expectedAssignment, topic1Uuid, Collections.singleton(1)); + // Topic 2 Partitions Assignment + mkAssignment(expectedAssignment, topic2Uuid, Collections.singleton(0)); + mkAssignment(expectedAssignment, topic2Uuid, Collections.singleton(1)); + + // Test for stickiness + assertEquals(computedAssignment.members().get(consumerA) + .targetPartitions(), new HashMap<>(currentAssignmentForA), + "Stickiness test failed for consumer A"); + assertEquals(computedAssignment.members().get(consumerB) + .targetPartitions(), new HashMap<>(currentAssignmentForB), + "Stickiness test failed for consumer B"); + + // Consumer C shouldn't get any assignment, due to stickiness A, B retain their assignments + assertNull(computedAssignment.members().get(consumerC)); + assertAssignment(expectedAssignment, computedAssignment); + assertCoPartitionJoinProperty(computedAssignment); + } + + @Test + public void testReassignmentWhenOnePartitionAddedForTwoConsumersTwoTopics() { + // Simulating adding a partition - originally T1 -> 3 Partitions and T2 -> 3 Partitions + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(4)); + topics.put(topic2Uuid, new AssignmentTopicMetadata(4)); + + Map<String, AssignmentMemberSpec> members = new HashMap<>(); + // Initial Subscriptions: A -> T1, T2 | B -> T1, T2 + + Map<Uuid, Set<Integer>> currentAssignmentForA = new HashMap<>(); + currentAssignmentForA.put(topic1Uuid, new HashSet<>(Arrays.asList(0, 1))); + currentAssignmentForA.put(topic2Uuid, new HashSet<>(Arrays.asList(0, 1))); + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForA) + ); + + Map<Uuid, Set<Integer>> currentAssignmentForB = new HashMap<>(); + currentAssignmentForB.put(topic1Uuid, Collections.singleton(2)); + currentAssignmentForB.put(topic2Uuid, Collections.singleton(2)); + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForB) + ); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<Uuid, Set<Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + mkAssignment(expectedAssignment, topic1Uuid, Arrays.asList(0, 1)); + mkAssignment(expectedAssignment, topic1Uuid, Arrays.asList(2, 3)); + // Topic 2 Partitions Assignment + mkAssignment(expectedAssignment, topic2Uuid, Arrays.asList(0, 1)); + mkAssignment(expectedAssignment, topic2Uuid, Arrays.asList(2, 3)); + + // Test for stickiness + assertEquals(computedAssignment.members().get(consumerA) + .targetPartitions(), new HashMap<>(currentAssignmentForA), + "Stickiness test failed for consumer A"); + // Implicitly stickiness is checked for B also since the other set of assigned partitions is (2,3) + + assertAssignment(expectedAssignment, computedAssignment); + assertCoPartitionJoinProperty(computedAssignment); + } + + @Test + public void testReassignmentWhenOneConsumerAddedAfterInitialAssignmentWithTwoConsumersTwoTopics() { + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic2Uuid, new AssignmentTopicMetadata(3)); + + Map<String, AssignmentMemberSpec> members = new HashMap<>(); + // Initial Subscriptions: A -> T1, T2 | B -> T1, T2 | C -> T1, T2 + + Map<Uuid, Set<Integer>> currentAssignmentForA = new HashMap<>(); + currentAssignmentForA.put(topic1Uuid, new HashSet<>(Arrays.asList(0, 1))); + currentAssignmentForA.put(topic2Uuid, new HashSet<>(Arrays.asList(0, 1))); + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForA) + ); + + Map<Uuid, Set<Integer>> currentAssignmentForB = new HashMap<>(); + currentAssignmentForB.put(topic1Uuid, Collections.singleton(2)); + currentAssignmentForB.put(topic2Uuid, Collections.singleton(2)); + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForB) + ); + + // Add a new consumer to trigger a re-assignment + members.put(consumerC, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + Collections.emptyMap())); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<Uuid, Set<Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + mkAssignment(expectedAssignment, topic1Uuid, Collections.singleton(0)); + mkAssignment(expectedAssignment, topic1Uuid, Collections.singleton(2)); + mkAssignment(expectedAssignment, topic1Uuid, Collections.singleton(1)); + // Topic 2 Partitions Assignment + mkAssignment(expectedAssignment, topic2Uuid, Collections.singleton(0)); + mkAssignment(expectedAssignment, topic2Uuid, Collections.singleton(2)); + mkAssignment(expectedAssignment, topic2Uuid, Collections.singleton(1)); + + // Test for stickiness + assertEquals(computedAssignment.members().get(consumerB) + .targetPartitions(), new HashMap<>(currentAssignmentForB), + "Stickiness test failed for Consumer B"); + assertTrue(computedAssignment.members().get(consumerA) + .targetPartitions().get(topic1Uuid).contains(0), + "Stickiness test failed for Consumer A"); + + assertAssignment(expectedAssignment, computedAssignment); + assertCoPartitionJoinProperty(computedAssignment); + } + @Test + public void testReassignmentWhenOneConsumerAddedAndOnePartitionAfterInitialAssignmentWithTwoConsumersTwoTopics() { + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + // Add a new partition to topic 1, initially T1 -> 3 partitions + topics.put(topic1Uuid, new AssignmentTopicMetadata(4)); + topics.put(topic2Uuid, new AssignmentTopicMetadata(3)); + + Map<String, AssignmentMemberSpec> members = new HashMap<>(); + // Initial Subscriptions: A -> T1, T2 | B -> T1, T2 | C -> T1, T2 + + Map<Uuid, Set<Integer>> currentAssignmentForA = new HashMap<>(); + currentAssignmentForA.put(topic1Uuid, new HashSet<>(Arrays.asList(0, 1))); + currentAssignmentForA.put(topic2Uuid, new HashSet<>(Arrays.asList(0, 1))); + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForA) + ); + + Map<Uuid, Set<Integer>> currentAssignmentForB = new HashMap<>(); + currentAssignmentForB.put(topic1Uuid, Collections.singleton(2)); + currentAssignmentForB.put(topic2Uuid, Collections.singleton(2)); + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForB) + ); + + // Add a new consumer to trigger a re-assignment + members.put(consumerC, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Collections.singletonList(topic1Uuid), + Collections.emptyMap())); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<Uuid, Set<Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + mkAssignment(expectedAssignment, topic1Uuid, Arrays.asList(0, 1)); + mkAssignment(expectedAssignment, topic1Uuid, Collections.singleton(2)); + mkAssignment(expectedAssignment, topic1Uuid, Collections.singleton(3)); + // Topic 2 Partitions Assignment + // Since the new consumer isn't subscribed to topic 2 the assignment shouldn't change + mkAssignment(expectedAssignment, topic2Uuid, Arrays.asList(0, 1)); + mkAssignment(expectedAssignment, topic2Uuid, Collections.singleton(2)); + System.out.println("assignment is " + computedAssignment); + // Test for stickiness + assertEquals(computedAssignment.members().get(consumerA) + .targetPartitions(), new HashMap<>(currentAssignmentForA), + "Stickiness test failed for Consumer A"); + assertEquals(computedAssignment.members().get(consumerB) + .targetPartitions(), new HashMap<>(currentAssignmentForB), + "Stickiness test failed for Consumer B"); + + assertAssignment(expectedAssignment, computedAssignment); + } + + @Test + public void testReassignmentWhenOneConsumerRemovedAfterInitialAssignmentWithTwoConsumersTwoTopics() { + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic2Uuid, new AssignmentTopicMetadata(3)); + + Map<String, AssignmentMemberSpec> members = new HashMap<>(); + // Consumer A was removed + + Map<Uuid, Set<Integer>> currentAssignmentForB = new HashMap<>(); + currentAssignmentForB.put(topic1Uuid, new HashSet<>(Collections.singletonList(2))); + currentAssignmentForB.put(topic2Uuid, new HashSet<>(Collections.singletonList(2))); + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid), + currentAssignmentForB) + ); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<Uuid, Set<Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + mkAssignment(expectedAssignment, topic1Uuid, Arrays.asList(0, 1, 2)); + // Topic 2 Partitions Assignment + mkAssignment(expectedAssignment, topic2Uuid, Arrays.asList(0, 1, 2)); + + assertAssignment(expectedAssignment, computedAssignment); + assertCoPartitionJoinProperty(computedAssignment); + } + + @Test + public void testReassignmentWhenMultipleSubscriptionsRemovedAfterInitialAssignmentWithThreeConsumersTwoTopics() { + + Map<Uuid, AssignmentTopicMetadata> topics = new HashMap<>(); + topics.put(topic1Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic2Uuid, new AssignmentTopicMetadata(3)); + topics.put(topic3Uuid, new AssignmentTopicMetadata(2)); + + Map<String, AssignmentMemberSpec> members = new HashMap<>(); + // Let initial subscriptions be A -> T1, T2 // B -> T2 // C -> T2, T3 + // Change the subscriptions to A -> T1 // B -> T1, T2, T3 // C -> T2 + + Map<Uuid, Set<Integer>> currentAssignmentForA = new HashMap<>(); + currentAssignmentForA.put(topic1Uuid, new HashSet<>(Arrays.asList(0, 1, 2))); + currentAssignmentForA.put(topic2Uuid, Collections.singleton(0)); + members.put(consumerA, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Collections.singletonList(topic1Uuid), + currentAssignmentForA) + ); + + Map<Uuid, Set<Integer>> currentAssignmentForB = new HashMap<>(); + currentAssignmentForB.put(topic2Uuid, Collections.singleton(1)); + members.put(consumerB, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Arrays.asList(topic1Uuid, topic2Uuid, topic3Uuid), + currentAssignmentForB) + ); + + Map<Uuid, Set<Integer>> currentAssignmentForC = new HashMap<>(); + currentAssignmentForC.put(topic2Uuid, Collections.singleton(2)); + currentAssignmentForC.put(topic3Uuid, new HashSet<>(Arrays.asList(0, 1))); + members.put(consumerC, new AssignmentMemberSpec( + Optional.empty(), + Optional.empty(), + Collections.singletonList(topic2Uuid), + currentAssignmentForC) + ); + + AssignmentSpec assignmentSpec = new AssignmentSpec(members, topics); + GroupAssignment computedAssignment = assignor.assign(assignmentSpec); + + Map<Uuid, Set<Set<Integer>>> expectedAssignment = new HashMap<>(); + // Topic 1 Partitions Assignment + mkAssignment(expectedAssignment, topic1Uuid, Arrays.asList(0, 1)); + mkAssignment(expectedAssignment, topic1Uuid, Collections.singleton(2)); + // Topic 2 Partitions Assignment + mkAssignment(expectedAssignment, topic2Uuid, Arrays.asList(0, 1)); + mkAssignment(expectedAssignment, topic2Uuid, Collections.singleton(2)); + // Topic 3 Partitions Assignment + mkAssignment(expectedAssignment, topic3Uuid, Arrays.asList(0, 1)); + + // Test for stickiness + assertTrue(computedAssignment.members().get(consumerC) + .targetPartitions().get(topic2Uuid).contains(2), + "Stickiness test failed for Consumer C"); + assertTrue(computedAssignment.members().get(consumerA) + .targetPartitions().get(topic1Uuid).containsAll(Arrays.asList(0, 1)), + "Stickiness test failed for Consumer A"); + + assertAssignment(expectedAssignment, computedAssignment); + } + + private void mkAssignment(Map<Uuid, Set<Set<Integer>>> expectedAssignment, Uuid topicId, Collection<Integer> partitions) { + expectedAssignment.computeIfAbsent(topicId, k -> new HashSet<>()).add(new HashSet<>(partitions)); + } + + // We have a set of sets with the partitions that should be distributed amongst the consumers, if it exists then remove it from the set. + // The test is done like this since the order in which members are assigned partitions isn't guaranteed. We are just testing if the computed + // assignment contains the expected set of partitions, irrespective of which member got them. + private void assertAssignment(Map<Uuid, Set<Set<Integer>>> expectedAssignment, GroupAssignment computedGroupAssignment) { + for (MemberAssignment member : computedGroupAssignment.members().values()) { + Map<Uuid, Set<Integer>> computedAssignmentForMember = member.targetPartitions(); + for (Map.Entry<Uuid, Set<Integer>> assignmentForTopic : computedAssignmentForMember.entrySet()) { + Uuid topicId = assignmentForTopic.getKey(); + Set<Integer> assignmentPartitionsSet = assignmentForTopic.getValue(); + assertTrue(expectedAssignment.get(topicId).contains(assignmentPartitionsSet)); + expectedAssignment.remove(assignmentPartitionsSet); + } + } + } + + private void assertCoPartitionJoinProperty(GroupAssignment groupAssignment) { + for (MemberAssignment member : groupAssignment.members().values()) { + Map<Uuid, Set<Integer>> computedAssignmentForMember = member.targetPartitions(); + Set<Integer> compareSet = new HashSet<>(); + for (Set<Integer> partitionsForTopicSet : computedAssignmentForMember.values()) { + if (compareSet.isEmpty()) { + compareSet = partitionsForTopicSet; + } + assertEquals(compareSet, partitionsForTopicSet); + } + } + } +} Review Comment: changing multiple subscriptions has similar effects as adding and removing consumers and that test exists so I didn't add another one. -- This is an automated message from the Apache Git Service. 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