divijvaidya commented on code in PR #12590:
URL: https://github.com/apache/kafka/pull/12590#discussion_r968386276
##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/Fetcher.java:
##########
@@ -446,6 +429,31 @@ private RequestFuture<ClientResponse>
sendMetadataRequest(MetadataRequest.Builde
return client.send(node, request);
}
+ /**
+ * Send Fetch Request to Kafka cluster asynchronously.
+ *
+ * This method is visible for testing.
+ *
+ * @return A future that indicates result of sent Fetch request
+ */
+ RequestFuture<ClientResponse> sendFetchRequestToNode(final
FetchSessionHandler.FetchRequestData requestData,
+ final Node
fetchTarget) {
+ final short maxVersion = requestData.canUseTopicIds() ?
ApiKeys.FETCH.latestVersion() : (short) 12;
+
+ final FetchRequest.Builder request = FetchRequest.Builder
+ .forConsumer(maxVersion, this.maxWaitMs, this.minBytes,
requestData.toSend())
+ .isolationLevel(isolationLevel)
+ .setMaxBytes(this.maxBytes)
+ .metadata(requestData.metadata())
+ .removed(requestData.toForget())
+ .replaced(requestData.toReplace())
+ .rackId(clientRackId);
+
+ log.debug("Sending {} {} to broker {}", isolationLevel, requestData,
fetchTarget);
Review Comment:
Note that we use [slf4j
logger](https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/clients/consumer/KafkaConsumer.java#L61).
Slf4j is quite intelligent and doesn't execute the the log statement if the
correct level is not set when we use the parameterized (i.e. using {}) variant.
You can find more information about it here:
https://www.slf4j.org/faq.html#logging_performance
In fact, we should probably add this to our "coding standards guide" for
Apache Kafka (if any such thing exists).
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