lianetm commented on code in PR #15511:
URL: https://github.com/apache/kafka/pull/15511#discussion_r1521745679
##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/MembershipManagerImpl.java:
##########
@@ -508,9 +508,30 @@ private void
processAssignmentReceived(ConsumerGroupHeartbeatResponseData.Assign
*/
private void replaceTargetAssignmentWithNewAssignment(
ConsumerGroupHeartbeatResponseData.Assignment assignment) {
- currentTargetAssignment.clear();
+
+ // Return if the same as current assignment; comparison without
creating a new collection
+ if (currentTargetAssignment != null) {
+ // check if the new assignment is different from the current
target assignment
+ if (currentTargetAssignment.partitions.size() ==
assignment.topicPartitions().size() &&
+ assignment.topicPartitions().stream().allMatch(
+ tp ->
currentTargetAssignment.partitions.containsKey(tp.topicId()) &&
+
currentTargetAssignment.partitions.get(tp.topicId()).size() ==
tp.partitions().size() &&
+
currentTargetAssignment.partitions.get(tp.topicId()).containsAll(tp.partitions())))
{
+ return;
+ }
+ }
+
+ // Bump local epoch and replace assignment
+ long nextLocalEpoch;
+ if (currentTargetAssignment == null) {
+ nextLocalEpoch = 0;
+ } else {
+ nextLocalEpoch = currentTargetAssignment.localEpoch + 1;
+ }
Review Comment:
Is there a reason why we need to compute epochs on the client here? The
server is the one bumping the epochs whenever it computes a new assignment for
a member. I was expecting that we just keep a `LocalAssignment` that will
contain the partitions and epoch the broker sent on the
`ConsumerGroupHeartbeatResponseData`
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