squah-confluent commented on code in PR #20055:
URL: https://github.com/apache/kafka/pull/20055#discussion_r2188608770
##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/modern/consumer/CurrentAssignmentBuilder.java:
##########
@@ -215,6 +284,64 @@ private boolean ownsRevokedPartitions(
return false;
}
+ /**
+ * Updates the current assignment, removing any partitions that are not
part of the subscribed topics.
+ * This method is a lot faster than running the full reconciliation logic
in computeNextAssignment.
+ *
+ * @param memberAssignedPartitions The assigned partitions of the member
to use.
+ * @return A new ConsumerGroupMember.
+ */
+ private ConsumerGroupMember updateCurrentAssignment(
+ Map<Uuid, Set<Integer>> memberAssignedPartitions
+ ) {
+ Set<Uuid> subscribedTopicIds = subscribedTopicIds();
+
+ // Reuse the original map if no topics need to be removed.
+ Map<Uuid, Set<Integer>> newAssignedPartitions =
memberAssignedPartitions;
+ Map<Uuid, Set<Integer>> newPartitionsPendingRevocation = new
HashMap<>(member.partitionsPendingRevocation());
+ for (Map.Entry<Uuid, Set<Integer>> entry :
memberAssignedPartitions.entrySet()) {
Review Comment:
Sure, we can do that. I pushed the change. It does introduce extra code
paths to test.
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