cameronlee314 commented on a change in pull request #947: SAMZA-2120: Enable
custom handling of ConsumerRecords consumed by Kafka
URL: https://github.com/apache/samza/pull/947#discussion_r264370317
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File path:
samza-kafka/src/main/scala/org/apache/samza/system/kafka/KafkaConsumerProxy.java
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@@ -328,9 +326,21 @@ private void fetchMessages() {
return results;
}
- private int getRecordSize(ConsumerRecord<K, V> r) {
- int keySize = (r.key() == null) ? 0 : r.serializedKeySize();
- return keySize + r.serializedValueSize();
+ /**
+ * Convert a {@link ConsumerRecord} to an {@link IncomingMessageEnvelope}.
+ *
+ * This has a protected visibility so that {@link KafkaConsumerProxy} can be
extended to add special handling logic
+ * for custom Kafka systems.
+ *
+ * @param consumerRecord {@link ConsumerRecord} from Kafka that was consumed
+ * @param systemStreamPartition {@link SystemStreamPartition} corresponding
to the record
+ * @return {@link IncomingMessageEnvelope} corresponding to the {@code
consumerRecord}
+ */
+ protected IncomingMessageEnvelope handleNewRecord(ConsumerRecord<K, V>
consumerRecord,
Review comment:
I originally considered a method name like that, but I felt that this hook
could include some other custom logic as well, such as managing managing
offsets for committing them back to the kafka broker.
We could use `toIncomingMessageEnvelope` for now and then change it later,
but I figured `handleNewRecord` leaves it a bit more open.
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