content: /*
   * 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.metadata;
  
  import org.apache.kafka.common.Uuid;
  import org.apache.kafka.common.metadata.PartitionRecord;
  import org.apache.kafka.image.TopicsDelta;
  import org.apache.kafka.image.TopicsImage;
  
  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.util.Arrays;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  import java.util.concurrent.TimeUnit;
  import java.util.stream.Collectors;
  
  @State(Scope.Benchmark)
  @Fork(value = 1)
  @Warmup(iterations = 3)
  @Measurement(iterations = 5)
  @BenchmarkMode(Mode.AverageTime)
  @OutputTimeUnit(TimeUnit.MILLISECONDS)
  public class TopicsImageZonalOutageBenchmark {
      @Param({"12500", "25000", "50000", "100000"})
      private int totalTopicCount;
      @Param({"10"})
      private int partitionsPerTopic;
      @Param({"3"})
      private int replicationFactor;
      @Param({"10000"})
      private int numReplicasPerBroker;
  
      private TopicsDelta topicsDelta;
  
  
      @Setup(Level.Trial)
      public void setup() {
          // build an image containing all of the specified topics and partitions
          TopicsDelta buildupTopicsDelta = TopicsImageSnapshotLoadBenchmark.getInitialTopicsDelta(totalTopicCount, partitionsPerTopic, replicationFactor, numReplicasPerBroker);
          TopicsImage builtupTopicsImage = buildupTopicsDelta.apply();
          // build a delta to apply within the benchmark code
          // that perturbs all the topic-partitions for broker 0
          // (as might happen in a zonal outage, one broker at a time, ultimately across 1/3 of the brokers in the cluster).
          // It turns out that
          topicsDelta = new TopicsDelta(builtupTopicsImage);
          Set<Uuid> perturbedTopics = new HashSet<>();
          builtupTopicsImage.topicsById().forEach((topicId, topicImage) ->
              topicImage.partitions().forEach((partitionNumber, partitionRegistration) -> {
                  List<Integer> newIsr = Arrays.stream(partitionRegistration.isr).boxed().filter(n -> n != 0).collect(Collectors.toList());
                  if (newIsr.size() < replicationFactor) {
                      perturbedTopics.add(topicId);
                      topicsDelta.replay(new PartitionRecord().
                          setPartitionId(partitionNumber).
                          setTopicId(topicId).
                          setReplicas(Arrays.stream(partitionRegistration.replicas).boxed().collect(Collectors.toList())).
                          setIsr(newIsr).
                          setRemovingReplicas(Collections.emptyList()).
                          setAddingReplicas(Collections.emptyList()).
                          setLeader(newIsr.get(0)));
                  }
              })
          );
          int numBrokers = TopicsImageSnapshotLoadBenchmark.getNumBrokers(totalTopicCount, partitionsPerTopic, replicationFactor, numReplicasPerBroker);
          System.out.print("(Perturbing 1 of " + numBrokers + " brokers, or " + perturbedTopics.size() + " topics within metadata having " + totalTopicCount + " total topics) ");
      }
  
      @Benchmark
      public void testTopicsDeltaZonalOutage() {
          topicsDelta.apply();
      }
  }
  