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[improve][broker] PIP-192 Added namespace unload scheduler (apache#19477
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.../main/java/org/apache/pulsar/broker/loadbalance/extensions/scheduler/UnloadScheduler.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.apache.pulsar.broker.loadbalance.extensions.scheduler; | ||
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| import com.google.common.annotations.VisibleForTesting; | ||
| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.concurrent.CompletableFuture; | ||
| import java.util.concurrent.ScheduledExecutorService; | ||
| import java.util.concurrent.ScheduledFuture; | ||
| import java.util.concurrent.TimeUnit; | ||
| import lombok.extern.slf4j.Slf4j; | ||
| 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.UnloadDecision; | ||
| import org.apache.pulsar.common.util.FutureUtil; | ||
| import org.apache.pulsar.common.util.Reflections; | ||
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| @Slf4j | ||
| public class UnloadScheduler implements LoadManagerScheduler { | ||
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| private final NamespaceUnloadStrategy namespaceUnloadStrategy; | ||
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| private final ScheduledExecutorService loadManagerExecutor; | ||
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| private final LoadManagerContext context; | ||
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| private final ServiceUnitStateChannel channel; | ||
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| private final ServiceConfiguration conf; | ||
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| private volatile ScheduledFuture<?> task; | ||
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| private final Map<String, Long> recentlyUnloadedBundles; | ||
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| private final Map<String, Long> recentlyUnloadedBrokers; | ||
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| private volatile CompletableFuture<Void> currentRunningFuture = null; | ||
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| public UnloadScheduler(ScheduledExecutorService loadManagerExecutor, | ||
| LoadManagerContext context, | ||
| ServiceUnitStateChannel channel) { | ||
| this(loadManagerExecutor, context, channel, createNamespaceUnloadStrategy(context.brokerConfiguration())); | ||
| } | ||
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| @VisibleForTesting | ||
| protected UnloadScheduler(ScheduledExecutorService loadManagerExecutor, | ||
| LoadManagerContext context, | ||
| ServiceUnitStateChannel channel, | ||
| NamespaceUnloadStrategy strategy) { | ||
| this.namespaceUnloadStrategy = strategy; | ||
| this.recentlyUnloadedBundles = new HashMap<>(); | ||
| this.recentlyUnloadedBrokers = new HashMap<>(); | ||
| this.loadManagerExecutor = loadManagerExecutor; | ||
| this.context = context; | ||
| this.conf = context.brokerConfiguration(); | ||
| this.channel = channel; | ||
| } | ||
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| @Override | ||
| public synchronized void execute() { | ||
| boolean debugMode = conf.isLoadBalancerDebugModeEnabled() || log.isDebugEnabled(); | ||
| if (debugMode) { | ||
| log.info("Load balancer enabled: {}, Shedding enabled: {}.", | ||
| conf.isLoadBalancerEnabled(), conf.isLoadBalancerSheddingEnabled()); | ||
| } | ||
| if (!isLoadBalancerSheddingEnabled()) { | ||
| if (debugMode) { | ||
| log.info("The load balancer or load balancer shedding already disabled. Skipping."); | ||
| } | ||
| return; | ||
| } | ||
| if (currentRunningFuture != null && !currentRunningFuture.isDone()) { | ||
| if (debugMode) { | ||
| log.info("Auto namespace unload is running. Skipping."); | ||
| } | ||
| return; | ||
| } | ||
| // Remove bundles who have been unloaded for longer than the grace period from the recently unloaded map. | ||
| final long timeout = System.currentTimeMillis() | ||
| - TimeUnit.MINUTES.toMillis(conf.getLoadBalancerSheddingGracePeriodMinutes()); | ||
| recentlyUnloadedBundles.keySet().removeIf(e -> recentlyUnloadedBundles.get(e) < timeout); | ||
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| this.currentRunningFuture = channel.isChannelOwnerAsync().thenCompose(isChannelOwner -> { | ||
| if (!isChannelOwner) { | ||
| if (debugMode) { | ||
| log.info("Current broker is not channel owner. Skipping."); | ||
| } | ||
| return CompletableFuture.completedFuture(null); | ||
| } | ||
| return context.brokerRegistry().getAvailableBrokersAsync().thenCompose(availableBrokers -> { | ||
| if (debugMode) { | ||
| log.info("Available brokers: {}", availableBrokers); | ||
| } | ||
| if (availableBrokers.size() <= 1) { | ||
| log.info("Only 1 broker available: no load shedding will be performed. Skipping."); | ||
| return CompletableFuture.completedFuture(null); | ||
| } | ||
| final UnloadDecision unloadDecision = namespaceUnloadStrategy | ||
| .findBundlesForUnloading(context, recentlyUnloadedBundles, recentlyUnloadedBrokers); | ||
| if (debugMode) { | ||
| log.info("[{}] Unload decision result: {}", | ||
| namespaceUnloadStrategy.getClass().getSimpleName(), unloadDecision.toString()); | ||
| } | ||
| if (unloadDecision.getUnloads().isEmpty()) { | ||
| if (debugMode) { | ||
| log.info("[{}] Unload decision unloads is empty. Skipping.", | ||
| namespaceUnloadStrategy.getClass().getSimpleName()); | ||
| } | ||
| return CompletableFuture.completedFuture(null); | ||
| } | ||
| List<CompletableFuture<Void>> futures = new ArrayList<>(); | ||
| unloadDecision.getUnloads().forEach((broker, unload) -> { | ||
| log.info("[{}] Unloading bundle: {}", namespaceUnloadStrategy.getClass().getSimpleName(), unload); | ||
| futures.add(channel.publishUnloadEventAsync(unload).thenAccept(__ -> { | ||
| recentlyUnloadedBundles.put(unload.serviceUnit(), System.currentTimeMillis()); | ||
| recentlyUnloadedBrokers.put(unload.sourceBroker(), System.currentTimeMillis()); | ||
| })); | ||
| }); | ||
| return FutureUtil.waitForAll(futures).exceptionally(ex -> { | ||
| log.error("[{}] Namespace unload has exception.", | ||
| namespaceUnloadStrategy.getClass().getSimpleName(), ex); | ||
| return null; | ||
| }); | ||
| }); | ||
| }); | ||
| } | ||
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| @Override | ||
| public void start() { | ||
| long loadSheddingInterval = TimeUnit.MINUTES | ||
| .toMillis(conf.getLoadBalancerSheddingIntervalMinutes()); | ||
| this.task = loadManagerExecutor.scheduleAtFixedRate( | ||
| this::execute, loadSheddingInterval, loadSheddingInterval, TimeUnit.MILLISECONDS); | ||
| } | ||
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| @Override | ||
| public void close() { | ||
| if (this.task != null) { | ||
| this.task.cancel(false); | ||
| } | ||
| this.recentlyUnloadedBundles.clear(); | ||
| this.recentlyUnloadedBrokers.clear(); | ||
| } | ||
|
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| private static NamespaceUnloadStrategy createNamespaceUnloadStrategy(ServiceConfiguration conf) { | ||
| try { | ||
| return Reflections.createInstance(conf.getLoadBalancerLoadSheddingStrategy(), NamespaceUnloadStrategy.class, | ||
| Thread.currentThread().getContextClassLoader()); | ||
| } catch (Exception e) { | ||
| log.error("Error when trying to create namespace unload strategy: {}", | ||
| conf.getLoadBalancerLoadPlacementStrategy(), e); | ||
| } | ||
| log.error("create namespace unload strategy failed. using TransferShedder instead."); | ||
| return new TransferShedder(); | ||
| } | ||
|
|
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| private boolean isLoadBalancerSheddingEnabled() { | ||
| return conf.isLoadBalancerEnabled() && conf.isLoadBalancerSheddingEnabled(); | ||
| } | ||
| } |
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