AndrewJSchofield commented on code in PR #22270:
URL: https://github.com/apache/kafka/pull/22270#discussion_r3313362632
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clients/src/main/java/org/apache/kafka/clients/consumer/ConsumerRebalanceListener.java:
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@@ -154,18 +171,45 @@ public interface ConsumerRebalanceListener {
* necessary to catch these exceptions and re-attempt to wakeup or
interrupt the consumer thread.
*
* @param partitions The list of partitions that were assigned to the
consumer and now need to be revoked. This will
- * include the full assignment under the Classic/Eager
protocol, given that it revokes all partitions.
+ * include the full assignment under the Classic/Eager
protocol, given that it revokes all partitions.
* It will only include the subset to revoke under the
Classic/Cooperative and Consumer protocols.
* @throws org.apache.kafka.common.errors.WakeupException If raised from a
nested call to {@link KafkaConsumer}
* @throws org.apache.kafka.common.errors.InterruptException If raised
from a nested call to {@link KafkaConsumer}
*/
- void onPartitionsRevoked(Collection<TopicPartition> partitions);
+ default void onPartitionsRevoked(Collection<TopicPartition> partitions) {}
Review Comment:
This makes sense to me. What I suggest @adikou is to satisfy yourself that
this is a useful enhancement and there are no downsides we've not noticed so
far. Then you could revise the KIP and push for a new vote. It should still fit
comfortably in the 4.4 schedule, and be a more elegant solution. Thank you
@chia7712 for the valuable perspective.
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