lbradstreet commented on a change in pull request #9008: URL: https://github.com/apache/kafka/pull/9008#discussion_r455342535
########## File path: jmh-benchmarks/src/main/java/org/apache/kafka/jmh/common/FetchRequestBenchmark.java ########## @@ -0,0 +1,93 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.kafka.jmh.common; + +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.network.Send; +import org.apache.kafka.common.protocol.ApiKeys; +import org.apache.kafka.common.requests.ByteBufferChannel; +import org.apache.kafka.common.requests.FetchRequest; +import org.apache.kafka.common.requests.RequestHeader; +import org.openjdk.jmh.annotations.Benchmark; +import org.openjdk.jmh.annotations.BenchmarkMode; +import org.openjdk.jmh.annotations.Fork; +import org.openjdk.jmh.annotations.Level; +import org.openjdk.jmh.annotations.Measurement; +import org.openjdk.jmh.annotations.Mode; +import org.openjdk.jmh.annotations.OutputTimeUnit; +import org.openjdk.jmh.annotations.Param; +import org.openjdk.jmh.annotations.Scope; +import org.openjdk.jmh.annotations.Setup; +import org.openjdk.jmh.annotations.State; +import org.openjdk.jmh.annotations.Warmup; + +import java.io.IOException; +import java.util.HashMap; +import java.util.Map; +import java.util.Optional; +import java.util.concurrent.TimeUnit; + +@State(Scope.Benchmark) +@Fork(value = 1) +@Warmup(iterations = 5) +@Measurement(iterations = 15) +@BenchmarkMode(Mode.AverageTime) +@OutputTimeUnit(TimeUnit.NANOSECONDS) +public class FetchRequestBenchmark { + @Param({"1000"}) + private int topicCount; + + @Param({"20"}) + private int partitionCount; + + Map<TopicPartition, FetchRequest.PartitionData> fetchData; + + RequestHeader header; + + FetchRequest request; + + + @Setup(Level.Trial) + public void setup() { + this.fetchData = new HashMap<>(); + for (int topicIdx = 0; topicIdx < topicCount; topicIdx++) { + for (int partitionId = 0; partitionId < partitionCount; partitionId++) { + FetchRequest.PartitionData partitionData = new FetchRequest.PartitionData( + 0, 0, 4096, Optional.empty()); + fetchData.put(new TopicPartition(String.format("topic-%04d", topicIdx), partitionId), partitionData); + } + } + + this.header = new RequestHeader(ApiKeys.FETCH, ApiKeys.FETCH.latestVersion(), "jmh-benchmark", 100); + this.request = FetchRequest.Builder.forConsumer(0, 0, fetchData).build(ApiKeys.FETCH.latestVersion()); Review comment: Can you also try rerunning the benchmark with random topic names, e.g. `UUID.randomUUID().toString()` and compare it to the existing topic names? I think our hashCode implementation sucks and we are seeing a lot of collisions. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
