dajac commented on code in PR #13112:
URL: https://github.com/apache/kafka/pull/13112#discussion_r1081583343
##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinator.java:
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@@ -215,4 +223,86 @@ CompletableFuture<OffsetDeleteResponseData> deleteOffsets(
OffsetDeleteRequestData request,
BufferSupplier bufferSupplier
);
+
+ /**
+ * Return the partition index for the given Group.
+ *
+ * @param groupId The group id.
+ *
+ * @return The partition index.
+ */
+ int partitionFor(String groupId);
+
+ /**
+ * Commit or abort the pending transactional offsets for the given
partitions.
+ *
+ * @param producerId The producer id.
+ * @param partitions The partitions.
+ * @param transactionResult The result of the transaction.
+ */
+ void onTransactionCompleted(
+ long producerId,
+ Iterable<TopicPartition> partitions,
+ TransactionResult transactionResult
+ );
+
+ /**
+ * Delete the provided partitions' offsets.
+ *
+ * @param topicPartitions The deleted partitions.
+ * @param bufferSupplier The buffer supplier tight to the request
thread.
+ */
+ void onPartitionsDeleted(
+ List<TopicPartition> topicPartitions,
+ BufferSupplier bufferSupplier
+ );
+
+ /**
+ * Group coordinator is now the leader for the given partition at the
+ * given leader epoch. It should load cached state from the partition
+ * and begin handling requests for groups mapped to it.
+ *
+ * @param partitionIndex The partition index.
+ * @param partitionLeaderEpoch The leader epoch of the partition.
Review Comment:
That's right. It is all about the `__consumer_offsets`. `coordinatorEpoch`
is the leader epoch of the partition. I used leader epoch here because it is a
bit clearer to me.
Let me update those names to be consistent. Good point.
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