showuon commented on code in PR #12748:
URL: https://github.com/apache/kafka/pull/12748#discussion_r1015096016
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clients/src/main/java/org/apache/kafka/clients/consumer/ConsumerPartitionAssignor.java:
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@@ -102,20 +104,26 @@ final class Subscription {
private final ByteBuffer userData;
private final List<TopicPartition> ownedPartitions;
private Optional<String> groupInstanceId;
+ private final int generationId;
Review Comment:
Agree. Change to `Optional`
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