dongnuo123 commented on code in PR #20055:
URL: https://github.com/apache/kafka/pull/20055#discussion_r2180342268
##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/modern/consumer/CurrentAssignmentBuilder.java:
##########
@@ -215,6 +278,64 @@ 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()) {
+ if (!subscribedTopicIds.contains(entry.getKey())) {
+ if (newAssignedPartitions == memberAssignedPartitions) {
+ newAssignedPartitions = new
HashMap<>(memberAssignedPartitions);
+ newPartitionsPendingRevocation = new
HashMap<>(member.partitionsPendingRevocation());
+ }
+ newAssignedPartitions.remove(entry.getKey());
+ newPartitionsPendingRevocation.merge(
+ entry.getKey(),
+ entry.getValue(),
+ (existing, additional) -> {
+ existing = new HashSet<>(existing);
+ existing.addAll(additional);
+ return existing;
+ }
+ );
+ }
+ }
+
+ if (newAssignedPartitions == memberAssignedPartitions) {
+ // If no partitions were removed, we can return the member as is.
+ return member;
+ }
+
+ if (ownsRevokedPartitions(newPartitionsPendingRevocation)) {
Review Comment:
I understand this can avoid unnecessary state transition and involving extra
heartbeat but don't follow why there is a `UNREVOKED_PARTITIONS` ->
`UNRELEASED_PARTITIONS`. Is it possible for the second case to be
```
STABLE --subscription update--> UNREVOKED_PARTITIONS --regex and assignor
update--> STABLE
```
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