dajac commented on code in PR #20907:
URL: https://github.com/apache/kafka/pull/20907#discussion_r2598538427
##########
group-coordinator/src/test/java/org/apache/kafka/coordinator/group/GroupMetadataManagerTest.java:
##########
@@ -24387,6 +24387,287 @@ public void
testShareGroupRecordsNoExceptionOnReplay(CoordinatorRecord record) {
assertDoesNotThrow(() -> context.replay(record));
}
+ @Test
+ public void testReplayConsumerGroupCurrentMemberAssignmentWithCompaction()
{
+ String groupId = "fooup";
+ String memberIdA = "memberIdA";
+ String memberIdB = "memberIdB";
+ Uuid topicId = Uuid.randomUuid();
+
+ GroupMetadataManagerTestContext context = new
GroupMetadataManagerTestContext.Builder().build();
+
+ // This test enacts the following scenario:
+ // 1. Member A is assigned partition 0.
+ // 2. Member A is unassigned partition 0 [record removed by
compaction].
+ // 3. Member B is assigned partition 0.
+ // 4. Member A is assigned partition 1.
+ // If record 2 is processed, there are no issues, however with
compaction it is possible that
+ // unassignment records are removed. We would like to not fail in
these cases.
+ // Therefore we will allow assignments to owned partitions as long as
the epoch is larger.
+
+
context.replay(GroupCoordinatorRecordHelpers.newConsumerGroupCurrentAssignmentRecord(groupId,
new ConsumerGroupMember.Builder(memberIdA)
+ .setState(MemberState.STABLE)
+ .setMemberEpoch(11)
+ .setPreviousMemberEpoch(10)
+ .setAssignedPartitions(mkAssignment(mkTopicAssignment(topicId, 0)))
+ .build()));
+
+ // Partition 0's owner is replaced by member B at epoch 12.
+
context.replay(GroupCoordinatorRecordHelpers.newConsumerGroupCurrentAssignmentRecord(groupId,
new ConsumerGroupMember.Builder(memberIdB)
+ .setState(MemberState.STABLE)
+ .setMemberEpoch(12)
+ .setPreviousMemberEpoch(11)
+ .setAssignedPartitions(mkAssignment(mkTopicAssignment(topicId, 0)))
+ .build()));
+
+ // Partition 0 must remain with member B at epoch 12 even though
member A has just been unassigned partition 0.
+
context.replay(GroupCoordinatorRecordHelpers.newConsumerGroupCurrentAssignmentRecord(groupId,
new ConsumerGroupMember.Builder(memberIdA)
+ .setState(MemberState.STABLE)
+ .setMemberEpoch(13)
+ .setPreviousMemberEpoch(12)
+ .setAssignedPartitions(mkAssignment(mkTopicAssignment(topicId, 1)))
+ .build()));
+
+ // Verify partition epochs.
+ ConsumerGroup group =
context.groupMetadataManager.consumerGroup(groupId);
+ assertEquals(12, group.currentPartitionEpoch(topicId, 0));
+ assertEquals(13, group.currentPartitionEpoch(topicId, 1));
+ }
+
+ @Test
+ public void
testReplayConsumerGroupCurrentMemberAssignmentUnownedTopicWithCompaction() {
+ String groupId = "fooup";
+ String memberIdA = "memberIdA";
+ String memberIdB = "memberIdB";
+ Uuid fooTopicId = Uuid.randomUuid();
+ Uuid barTopicId = Uuid.randomUuid();
+
+ GroupMetadataManagerTestContext context = new
GroupMetadataManagerTestContext.Builder().build();
+
+ // This test enacts the following scenario:
+ // 1. Member A is assigned partition foo-0.
+ // 2. Member A is unassigned partition foo-0 [record removed by
compaction].
+ // 3. Member B is assigned partition foo-0.
+ // 4. Member B is unassigned partition foo-0.
+ // 5. Member A is assigned partition bar-0.
+ // This is a legitimate set of assignments but with compaction the
unassignment record can be skipped.
+ // This can lead to conflicts from updating an owned partition in step
3 and attempting
+ // to remove nonexistent ownership in step 5. We want to ensure
removing ownership from a
+ // completely unowned partition in step 5 is allowed.
+
+
context.replay(GroupCoordinatorRecordHelpers.newConsumerGroupCurrentAssignmentRecord(groupId,
new ConsumerGroupMember.Builder(memberIdA)
+ .setState(MemberState.STABLE)
+ .setMemberEpoch(11)
+ .setPreviousMemberEpoch(10)
+ .setAssignedPartitions(mkAssignment(mkTopicAssignment(fooTopicId,
0)))
+ .build()));
+
+ // foo-0's owner is replaced by member B at epoch 12.
+
context.replay(GroupCoordinatorRecordHelpers.newConsumerGroupCurrentAssignmentRecord(groupId,
new ConsumerGroupMember.Builder(memberIdB)
+ .setState(MemberState.STABLE)
+ .setMemberEpoch(12)
+ .setPreviousMemberEpoch(11)
+ .setAssignedPartitions(mkAssignment(mkTopicAssignment(fooTopicId,
0)))
+ .build()));
+
+ // foo becomes unowned.
+
context.replay(GroupCoordinatorRecordHelpers.newConsumerGroupCurrentAssignmentRecord(groupId,
new ConsumerGroupMember.Builder(memberIdB)
+ .setState(MemberState.STABLE)
+ .setMemberEpoch(13)
+ .setPreviousMemberEpoch(12)
+ .build()));
+
+ // Member A is unassigned foo-0.
+
context.replay(GroupCoordinatorRecordHelpers.newConsumerGroupCurrentAssignmentRecord(groupId,
new ConsumerGroupMember.Builder(memberIdA)
+ .setState(MemberState.STABLE)
+ .setMemberEpoch(14)
+ .setPreviousMemberEpoch(13)
+ .setAssignedPartitions(mkAssignment(mkTopicAssignment(barTopicId,
0)))
+ .build()));
+
+ // Verify foo-0 is unowned and bar-0 is owned by member A at epoch 14.
+ ConsumerGroup group =
context.groupMetadataManager.consumerGroup(groupId);
+ assertEquals(-1, group.currentPartitionEpoch(fooTopicId, 0));
+ assertEquals(14, group.currentPartitionEpoch(barTopicId, 0));
+ }
+
+ @Test
+ public void
testReplayConsumerGroupCurrentMemberAssignmentSameEpochWithCompaction() {
+ String groupId = "fooup";
+ String memberIdA = "memberIdA";
+ String memberIdB = "memberIdB";
+ Uuid fooTopicId = Uuid.randomUuid();
+ Uuid barTopicId = Uuid.randomUuid();
+
+ GroupMetadataManagerTestContext context = new
GroupMetadataManagerTestContext.Builder().build();
+
+ // This test enacts the following scenario:
+ // 1. Member A unsubscribes from topic bar at epoch 10: Member A {
epoch: 10, assigned partitions: [foo], pending revocations: [bar] }
+ // 2. A new assignment is available at epoch 11 with member A
unsubscribing from topic foo.
+ // 3. Member A yields bar. The epoch is bumped to 11: Member A {
epoch: 11, assigned partitions: [], pending revocations: [foo] }
+ // 4. Member A yields topic foo. Member A { epoch: 11, assigned
partitions: [], pending revocations: [] } [removed by compaction]
+ // 5. Member B is assigned topic foo. Member B { epoch: 11, assigned
partitions: [foo], pending revocations: [] }
Review Comment:
This is addressed as part of https://github.com/apache/kafka/pull/21107.
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