adikou commented on code in PR #22270:
URL: https://github.com/apache/kafka/pull/22270#discussion_r3312957006
##########
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:
Yes, I see. It would preserve compat the same way with existing
implementations are all unchanged. Defining a standalone super-interface that's
not really implementable is already present in the codebase I see: like
`Measurable` (or `Serializable` in java).
Although I would have liked the reverse in terms of naming since the
`ConsumerRebalanceListener` is the root of this with ConsumerAware being the
extension point.
Since we're naming the new interface `RebalanceConsumer` in the param, can
we name the new super-interface `RebalanceListener` so they're similarly named
- the `Consumer` is implied since they're already in the `o.a.k.c.consumer`
package. We can then mark `ConsumerRebalanceListener` as deprecated and remove
in 5.0 to avoid confusion.
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