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[BALANCER] Implement balancer config
balancer.broker.balancing.mode (…
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common/src/main/java/org/astraea/common/balancer/BalancerUtils.java
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| /* | ||
| * 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.astraea.common.balancer; | ||
|
|
||
| import java.util.Arrays; | ||
| import java.util.Collection; | ||
| import java.util.Map; | ||
| import java.util.function.Function; | ||
| import java.util.function.Predicate; | ||
| import java.util.regex.Pattern; | ||
| import java.util.stream.Collectors; | ||
| import java.util.stream.IntStream; | ||
| import java.util.stream.Stream; | ||
| import org.astraea.common.EnumInfo; | ||
| import org.astraea.common.admin.ClusterInfo; | ||
| import org.astraea.common.admin.NodeInfo; | ||
| import org.astraea.common.admin.Replica; | ||
|
|
||
| public final class BalancerUtils { | ||
|
|
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| private BalancerUtils() {} | ||
|
|
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| public static Map<Integer, BalancingModes> balancingMode(ClusterInfo cluster, String config) { | ||
| var num = Pattern.compile("[0-9]+"); | ||
|
|
||
| var map = | ||
| Arrays.stream(config.split(",")) | ||
| .filter(Predicate.not(String::isEmpty)) | ||
| .map(x -> x.split(":")) | ||
| .collect( | ||
| Collectors.toUnmodifiableMap( | ||
| s -> (Object) (num.matcher(s[0]).find() ? Integer.parseInt(s[0]) : s[0]), | ||
| s -> | ||
| switch (s[1]) { | ||
| case "balancing" -> BalancingModes.BALANCING; | ||
| case "demoted" -> BalancingModes.DEMOTED; | ||
| case "excluded" -> BalancingModes.EXCLUDED; | ||
| default -> throw new IllegalArgumentException( | ||
| "Unsupported balancing mode: " + s[1]); | ||
| })); | ||
|
|
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| Function<Integer, BalancingModes> mode = | ||
| (id) -> map.getOrDefault(id, map.getOrDefault("default", BalancingModes.BALANCING)); | ||
|
|
||
| return cluster.brokers().stream() | ||
| .map(NodeInfo::id) | ||
| .collect(Collectors.toUnmodifiableMap(Function.identity(), mode)); | ||
| } | ||
|
|
||
| /** | ||
| * Verify there is no logic conflict between {@link BalancerConfigs#BALANCER_ALLOWED_TOPICS_REGEX} | ||
| * and {@link BalancerConfigs#BALANCER_BROKER_BALANCING_MODE}. It also performs other common | ||
| * validness checks to the cluster. | ||
| */ | ||
| public static void verifyClearBrokerValidness( | ||
| ClusterInfo cluster, Predicate<Integer> isDemoted, Predicate<String> allowedTopics) { | ||
| var disallowedTopicsToClear = | ||
| cluster.topicPartitionReplicas().stream() | ||
| .filter(tpr -> isDemoted.test(tpr.brokerId())) | ||
| .filter(tpr -> !allowedTopics.test(tpr.topic())) | ||
| .collect(Collectors.toUnmodifiableSet()); | ||
| if (!disallowedTopicsToClear.isEmpty()) | ||
| throw new IllegalArgumentException( | ||
| "Attempts to clear some brokers, but some of them contain topics that forbidden from being changed due to \"" | ||
| + BalancerConfigs.BALANCER_ALLOWED_TOPICS_REGEX | ||
| + "\": " | ||
| + disallowedTopicsToClear); | ||
|
|
||
| var ongoingEventReplica = | ||
| cluster.replicas().stream() | ||
| .filter(r -> isDemoted.test(r.nodeInfo().id())) | ||
| .filter(r -> r.isAdding() || r.isRemoving() || r.isFuture()) | ||
| .map(Replica::topicPartitionReplica) | ||
| .collect(Collectors.toUnmodifiableSet()); | ||
| if (!ongoingEventReplica.isEmpty()) | ||
| throw new IllegalArgumentException( | ||
| "Attempts to clear broker with ongoing migration event (adding/removing/future replica): " | ||
| + ongoingEventReplica); | ||
| } | ||
|
|
||
| /** | ||
| * Move all the replicas at the demoting broker to other allowed brokers. <b>BE CAREFUL, The | ||
| * implementation made no assumption for MoveCost or ClusterCost of the returned ClusterInfo.</b> | ||
| * Be aware of this limitation before using it as the starting point for a solution search. Some | ||
| * balancer implementation might have trouble finding answer when starting at a state where the | ||
| * MoveCost is already violated. | ||
| */ | ||
| public static ClusterInfo clearedCluster( | ||
| ClusterInfo initial, Predicate<Integer> clearBrokers, Predicate<Integer> allowedBrokers) { | ||
| final var allowed = | ||
| initial.nodes().stream() | ||
| .filter(node -> allowedBrokers.test(node.id())) | ||
| .filter(node -> Predicate.not(clearBrokers).test(node.id())) | ||
| .collect(Collectors.toUnmodifiableSet()); | ||
| final var nextBroker = Stream.generate(() -> allowed).flatMap(Collection::stream).iterator(); | ||
| final var nextBrokerFolder = | ||
| initial.brokerFolders().entrySet().stream() | ||
| .collect( | ||
| Collectors.toUnmodifiableMap( | ||
| Map.Entry::getKey, | ||
| x -> Stream.generate(x::getValue).flatMap(Collection::stream).iterator())); | ||
|
|
||
| var trackingReplicaList = | ||
| initial.topicPartitions().stream() | ||
| .collect( | ||
| Collectors.toUnmodifiableMap( | ||
| tp -> tp, | ||
| tp -> | ||
| initial.replicas(tp).stream() | ||
| .map(Replica::nodeInfo) | ||
| .collect(Collectors.toSet()))); | ||
| return ClusterInfo.builder(initial) | ||
| .mapLog( | ||
| replica -> { | ||
| if (!clearBrokers.test(replica.nodeInfo().id())) return replica; | ||
| var currentReplicaList = trackingReplicaList.get(replica.topicPartition()); | ||
| var broker = | ||
| IntStream.range(0, allowed.size()) | ||
| .mapToObj(i -> nextBroker.next()) | ||
| .filter(b -> !currentReplicaList.contains(b)) | ||
| .findFirst() | ||
| .orElseThrow( | ||
| () -> | ||
| new IllegalStateException( | ||
| "Unable to clear replica " | ||
| + replica.topicPartitionReplica() | ||
| + " for broker " | ||
| + replica.nodeInfo().id() | ||
| + ", the allowed destination brokers are " | ||
| + allowed.stream() | ||
| .map(NodeInfo::id) | ||
| .collect(Collectors.toUnmodifiableSet()) | ||
| + " but all of them already hosting a replica for this partition. " | ||
| + "There is no broker can adopt this replica.")); | ||
| var folder = nextBrokerFolder.get(broker.id()).next(); | ||
|
|
||
| // update the tracking list. have to do this to avoid putting two replicas from the | ||
| // same tp to one broker. | ||
| currentReplicaList.remove(replica.nodeInfo()); | ||
| currentReplicaList.add(broker); | ||
|
|
||
| return Replica.builder(replica).nodeInfo(broker).path(folder).build(); | ||
| }) | ||
| .build(); | ||
| } | ||
|
|
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| public enum BalancingModes implements EnumInfo { | ||
| BALANCING, | ||
| DEMOTED, | ||
| EXCLUDED; | ||
|
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| public static BalancingModes ofAlias(String alias) { | ||
| return EnumInfo.ignoreCaseEnum(BalancingModes.class, alias); | ||
| } | ||
|
|
||
| @Override | ||
| public String alias() { | ||
| return name(); | ||
| } | ||
|
|
||
| @Override | ||
| public String toString() { | ||
| return alias(); | ||
| } | ||
| } | ||
| } |
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