Demogorgon314 commented on code in PR #19622: URL: https://github.com/apache/pulsar/pull/19622#discussion_r1122735167
########## pulsar-broker/src/main/java/org/apache/pulsar/broker/loadbalance/extensions/scheduler/SplitScheduler.java: ########## @@ -0,0 +1,172 @@ +/* + * 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.pulsar.broker.loadbalance.extensions.scheduler; + +import static org.apache.pulsar.broker.loadbalance.extensions.models.SplitDecision.Label.Failure; +import static org.apache.pulsar.broker.loadbalance.extensions.models.SplitDecision.Label.Success; +import static org.apache.pulsar.broker.loadbalance.extensions.models.SplitDecision.Reason.Unknown; +import java.util.ArrayList; +import java.util.List; +import java.util.Set; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.ScheduledExecutorService; +import java.util.concurrent.ScheduledFuture; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicReference; +import lombok.extern.slf4j.Slf4j; +import org.apache.pulsar.broker.PulsarService; +import org.apache.pulsar.broker.ServiceConfiguration; +import org.apache.pulsar.broker.loadbalance.extensions.LoadManagerContext; +import org.apache.pulsar.broker.loadbalance.extensions.channel.ServiceUnitStateChannel; +import org.apache.pulsar.broker.loadbalance.extensions.models.SplitCounter; +import org.apache.pulsar.broker.loadbalance.extensions.models.SplitDecision; +import org.apache.pulsar.broker.loadbalance.extensions.strategy.DefaultNamespaceBundleSplitStrategyImpl; +import org.apache.pulsar.broker.loadbalance.extensions.strategy.NamespaceBundleSplitStrategy; +import org.apache.pulsar.common.stats.Metrics; +import org.apache.pulsar.common.util.FutureUtil; + +/** + * Service Unit(e.g. bundles) Split scheduler. + */ +@Slf4j +public class SplitScheduler implements LoadManagerScheduler { + + private final PulsarService pulsar; + + private final ScheduledExecutorService loadManagerExecutor; + + private final LoadManagerContext context; + + private final ServiceConfiguration conf; + + private final ServiceUnitStateChannel serviceUnitStateChannel; + + private final NamespaceBundleSplitStrategy bundleSplitStrategy; + + private final SplitCounter counter; + + private final AtomicReference<List<Metrics>> splitMetrics; + + private volatile ScheduledFuture<?> task; + + private long counterLastUpdatedAt = 0; + + public SplitScheduler(PulsarService pulsar, + ServiceUnitStateChannel serviceUnitStateChannel, + SplitCounter counter, + AtomicReference<List<Metrics>> splitMetrics, + LoadManagerContext context, + NamespaceBundleSplitStrategy bundleSplitStrategy) { + this.pulsar = pulsar; + this.loadManagerExecutor = pulsar.getLoadManagerExecutor(); + this.counter = counter; + this.splitMetrics = splitMetrics; + this.context = context; + this.conf = pulsar.getConfiguration(); + this.bundleSplitStrategy = bundleSplitStrategy; + this.serviceUnitStateChannel = serviceUnitStateChannel; + } + + public SplitScheduler(PulsarService pulsar, + ServiceUnitStateChannel serviceUnitStateChannel, + SplitCounter counter, + AtomicReference<List<Metrics>> splitMetrics, + LoadManagerContext context) { + this(pulsar, serviceUnitStateChannel, counter, splitMetrics, context, + new DefaultNamespaceBundleSplitStrategyImpl(counter)); + } + + @Override + public void execute() { + boolean debugMode = conf.isLoadBalancerDebugModeEnabled() || log.isDebugEnabled(); + if (debugMode) { + log.info("Load balancer enabled: {}, Split enabled: {}.", + conf.isLoadBalancerEnabled(), conf.isLoadBalancerAutoBundleSplitEnabled()); + } + + if (!isLoadBalancerAutoBundleSplitEnabled()) { + if (debugMode) { + log.info("The load balancer or load balancer split already disabled. Skipping."); + } + return; + } + + synchronized (bundleSplitStrategy) { + final Set<SplitDecision> decisions = bundleSplitStrategy.findBundlesToSplit(context, pulsar); + if (!decisions.isEmpty()) { + List<CompletableFuture<Void>> futures = new ArrayList<>(); + for (SplitDecision decision : decisions) { + if (decision.getLabel() == Success) { + var split = decision.getSplit(); + futures.add(serviceUnitStateChannel.publishSplitEventAsync(split) + .whenComplete((__, e) -> { + if (e == null) { + counter.update(decision); + log.info("Published Split Event for {}", split); + } else { + counter.update(Failure, Unknown); + log.error("Failed to publish Split Event for {}", split); + } + })); + } + } + FutureUtil.waitForAll(futures).exceptionally(ex -> { + log.error("Failed to wait for split events to persist.", ex); + counter.update(Failure, Unknown); Review Comment: Already updated when `serviceUnitStateChannel.publishSplitEventAsync(split)` failure. Here is an unnecessary update. -- 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: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
