rreddy-22 commented on code in PR #14182: URL: https://github.com/apache/kafka/pull/14182#discussion_r1326817433
########## group-coordinator/src/main/java/org/apache/kafka/coordinator/group/assignor/AbstractUniformAssignmentBuilder.java: ########## @@ -0,0 +1,227 @@ +/* + * 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.coordinator.group.assignor; + +import org.apache.kafka.common.Uuid; +import org.apache.kafka.coordinator.group.common.TopicIdPartition; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; +import java.util.Comparator; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.stream.Collectors; +import java.util.stream.IntStream; + +/** + * The assignment builder is used to construct the target assignment based on the members' subscriptions. + * + * This class contains common utility methods and a class for obtaining and storing rack information. + */ +public abstract class AbstractUniformAssignmentBuilder { + protected abstract GroupAssignment buildAssignment(); + + /** + * Determines if rack-aware assignment is appropriate based on the provided rack information. + * + * @param memberRacks Racks where members are located. + * @param partitionRacks Racks where partitions are located. + * @param racksPerPartition Map of partitions to their associated racks. + * + * @return {@code true} if rack-aware assignment should be applied; {@code false} otherwise. + */ + protected static boolean useRackAwareAssignment( + Set<String> memberRacks, + Set<String> partitionRacks, + Map<TopicIdPartition, Set<String>> racksPerPartition + ) { + if (memberRacks.isEmpty() || Collections.disjoint(memberRacks, partitionRacks)) + return false; + else { + return !racksPerPartition.values().stream().allMatch(partitionRacks::equals); + } + } + + /** + * Adds the topic's partition to the member's target assignment. + */ + protected static void addPartitionToAssignment( + int partition, + Uuid topicId, + String memberId, + Map<String, MemberAssignment> targetAssignment + ) { + targetAssignment.get(memberId) + .targetPartitions() + .computeIfAbsent(topicId, __ -> new HashSet<>()) + .add(partition); + } + + /** + * Constructs a list of {@code TopicIdPartition} for each topic Id based on its partition count. + * + * @param allTopicIds The subscribed topic Ids. + * @param subscribedTopicDescriber Utility to fetch the partition count for a given topic. + * + * @return List of sorted {@code TopicIdPartition} for all provided topic Ids. + */ + protected static List<TopicIdPartition> allTopicIdPartitions( + Collection<Uuid> allTopicIds, + SubscribedTopicDescriber subscribedTopicDescriber + ) { + List<TopicIdPartition> allTopicIdPartitions = new ArrayList<>(); + // Sorted so that partitions from each topic can be distributed amongst its subscribers equally. + allTopicIds.stream().sorted().forEach(topic -> + IntStream.range(0, subscribedTopicDescriber.numPartitions(topic)) + .forEach(i -> allTopicIdPartitions.add(new TopicIdPartition(topic, i)) + ) Review Comment: I wasn't sure where it went tbh xD -- 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. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
