shibd commented on code in PR #18489: URL: https://github.com/apache/pulsar/pull/18489#discussion_r1027177087
########## pulsar-broker/src/main/java/org/apache/pulsar/broker/loadbalance/extensions/channel/ServiceUnitStateChannelImpl.java: ########## @@ -0,0 +1,761 @@ +/* + * 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.channel; + +import static org.apache.pulsar.broker.loadbalance.extensions.channel.ServiceUnitState.Assigned; +import static org.apache.pulsar.broker.loadbalance.extensions.channel.ServiceUnitState.Owned; +import static org.apache.pulsar.broker.loadbalance.extensions.channel.ServiceUnitState.Released; +import static org.apache.pulsar.broker.loadbalance.extensions.channel.ServiceUnitState.Splitting; +import static org.apache.pulsar.broker.loadbalance.extensions.channel.ServiceUnitStateChannelImpl.MetadataState.Jittery; +import static org.apache.pulsar.broker.loadbalance.extensions.channel.ServiceUnitStateChannelImpl.MetadataState.Stable; +import static org.apache.pulsar.broker.loadbalance.extensions.channel.ServiceUnitStateChannelImpl.MetadataState.Unstable; +import static org.apache.pulsar.metadata.api.extended.SessionEvent.SessionLost; +import static org.apache.pulsar.metadata.api.extended.SessionEvent.SessionReestablished; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Optional; +import java.util.Set; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.Executor; +import java.util.concurrent.ScheduledFuture; +import java.util.concurrent.Semaphore; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicInteger; +import lombok.extern.slf4j.Slf4j; +import org.apache.commons.lang3.StringUtils; +import org.apache.commons.lang3.mutable.MutableInt; +import org.apache.pulsar.broker.PulsarServerException; +import org.apache.pulsar.broker.PulsarService; +import org.apache.pulsar.broker.ServiceConfiguration; +import org.apache.pulsar.broker.loadbalance.LeaderBroker; +import org.apache.pulsar.broker.loadbalance.LeaderElectionService; +import org.apache.pulsar.broker.loadbalance.extensions.models.Split; +import org.apache.pulsar.broker.loadbalance.extensions.models.Unload; +import org.apache.pulsar.broker.loadbalance.impl.LoadManagerShared; +import org.apache.pulsar.client.admin.PulsarAdminException; +import org.apache.pulsar.client.api.MessageId; +import org.apache.pulsar.client.api.Producer; +import org.apache.pulsar.client.api.Schema; +import org.apache.pulsar.client.api.TableView; +import org.apache.pulsar.common.naming.NamespaceBundle; +import org.apache.pulsar.common.naming.NamespaceBundleSplitAlgorithm; +import org.apache.pulsar.common.naming.NamespaceName; +import org.apache.pulsar.common.naming.TopicDomain; +import org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap; +import org.apache.pulsar.metadata.api.NotificationType; +import org.apache.pulsar.metadata.api.coordination.LeaderElectionState; +import org.apache.pulsar.metadata.api.extended.SessionEvent; + +@Slf4j +public class ServiceUnitStateChannelImpl implements ServiceUnitStateChannel { + public static final String TOPIC = + TopicDomain.persistent.value() + + "://" + + NamespaceName.SYSTEM_NAMESPACE + + "/service-unit-state-channel"; + private static final Schema<ServiceUnitStateData> SCHEMA = Schema.JSON(ServiceUnitStateData.class); + // TODO: define StateCompactionStrategy + private static final long COMPACTION_THRESHOLD = 5 * 1024 * 1024; // 5mb + private static final long MAX_IN_FLIGHT_STATE_WAITING_TIME_IN_MILLIS = 30 * 1000; // 30sec + public static final long MAX_CLEAN_UP_DELAY_TIME_IN_SECS = 3 * 60; // 3 mins + private static final long MIN_CLEAN_UP_DELAY_TIME_IN_SECS = 0; // 0 secs to clean immediately + private static final int MAX_OUTSTANDING_PUB_MESSAGES = 500; + private final PulsarService pulsar; + private final ConcurrentOpenHashMap<String, CompletableFuture<String>> getOwnerRequests; + private final String lookupServiceAddress; + // TODO: define BrokerRegistry + private final Semaphore outstandingCleanupTombstoneMessages; + private final ConcurrentOpenHashMap<String, CompletableFuture<Void>> cleanupJobs; + private LeaderElectionService leaderElectionService; + private TableView<ServiceUnitStateData> tableview; + private Producer<ServiceUnitStateData> producer; + private ScheduledFuture<?> cleanupTasks; + private SessionEvent lastMetadataSessionEvent = SessionReestablished; + private long lastMetadataSessionEventTimestamp = 0; + private long inFlightStateWaitingTimeInMillis; + private long maxCleanupDelayTimeInSecs; + private long minCleanupDelayTimeInSecs; + // cleanup metrics + private long totalCleanupCnt = 0; + private long totalBrokerCleanupTombstoneCnt = 0; + private long totalServiceUnitCleanupTombstoneCnt = 0; + private long totalServiceUnitCleanupErrorCnt = 0; + private long totalCleanupScheduledCnt = 0; + private long totalCleanupIgnoredCnt = 0; + private long totalCleanupCancelledCnt = 0; + private volatile boolean isActive; + + enum MetadataState { + Stable, + Jittery, + Unstable + } + + public ServiceUnitStateChannelImpl(PulsarService pulsar) { + this.isActive = false; + this.pulsar = pulsar; + ServiceConfiguration conf = pulsar.getConfiguration(); + this.lookupServiceAddress = pulsar.getLookupServiceAddress(); + this.outstandingCleanupTombstoneMessages = new Semaphore(MAX_OUTSTANDING_PUB_MESSAGES); + this.getOwnerRequests = ConcurrentOpenHashMap.<String, + CompletableFuture<String>>newBuilder().build(); + this.cleanupJobs = ConcurrentOpenHashMap.<String, CompletableFuture<Void>>newBuilder().build(); + this.inFlightStateWaitingTimeInMillis = MAX_IN_FLIGHT_STATE_WAITING_TIME_IN_MILLIS; + this.maxCleanupDelayTimeInSecs = MAX_CLEAN_UP_DELAY_TIME_IN_SECS; + this.minCleanupDelayTimeInSecs = MIN_CLEAN_UP_DELAY_TIME_IN_SECS; + } + + public synchronized void start() throws PulsarServerException { + try { + if (leaderElectionService != null) { + leaderElectionService.close(); + log.debug("Closed the channel leader election service."); + } + this.leaderElectionService = new LeaderElectionService( + pulsar.getCoordinationService(), pulsar.getSafeWebServiceAddress(), + state -> { + if (state == LeaderElectionState.Leading) { + log.debug("This broker:{} is the leader now.", lookupServiceAddress); + // TODO: schedule monitorOwnerships by brokerRegistry + } else { + log.debug("This broker:{} is a follower now.", lookupServiceAddress); + // TODO: cancel scheduled monitorOwnerships if any + } + }); + leaderElectionService.start(); + log.debug("Successfully started the channel leader election service."); + + if (producer != null) { + producer.close(); + log.debug("Closed the channel producer."); + } + producer = pulsar.getClient().newProducer(SCHEMA) + .enableBatching(true) + .topic(TOPIC) + .create(); + + log.debug("Successfully started the channel producer."); + + if (tableview != null) { + tableview.close(); + log.debug("Closed the channel tableview."); + } + tableview = pulsar.getClient().newTableViewBuilder(SCHEMA) + .topic(TOPIC) + // TODO: enable CompactionStrategy + .create(); + // TODO: schedule listen instead of foreachAndListen + tableview.forEachAndListen((key, value) -> handle(key, value)); + log.debug("Successfully started the channel tableview."); + + pulsar.getLocalMetadataStore().registerSessionListener(this::handleMetadataSessionEvent); + log.debug("Successfully registered the handleMetadataSessionEvent"); + + isActive = true; + log.info("Successfully started the channel."); + } catch (Exception e) { + String msg = "Failed to start the channel."; + log.error(msg, e); + throw new PulsarServerException(msg, e); + } + } + + public synchronized void close() throws PulsarServerException { + isActive = false; + try { + if (leaderElectionService != null) { + leaderElectionService.close(); + leaderElectionService = null; + log.debug("Successfully closed the channel leader election service."); + } + + if (tableview != null) { + tableview.close(); + tableview = null; + log.debug("Successfully closed the channel tableview."); + } + + if (producer != null) { + producer.close(); + producer = null; + log.info("Successfully closed the channel producer."); + } + + // TODO: clean brokerRegistry + + if (cleanupTasks != null) { + cleanupTasks.cancel(true); + cleanupTasks = null; + log.info("Successfully cancelled the cleanup tasks"); + } + + log.info("Successfully closed the channel."); + + } catch (Exception e) { + String msg = "Failed to close the channel."; + log.error(msg, e); + throw new PulsarServerException(msg, e); + } + } + + private void validateChannel() { + if (!isActive) { + throw new IllegalStateException("The channel has not been started."); + } + } + + public synchronized void scheduleCompaction() throws PulsarServerException { + try { + Long threshold = pulsar.getAdminClient().topicPolicies() + .getCompactionThreshold(TOPIC); + if (threshold == null || threshold == 0) { + pulsar.getAdminClient().topicPolicies() + .setCompactionThreshold(TOPIC, COMPACTION_THRESHOLD); + log.info("Scheduled compaction on topic:{}, threshold:{} bytes", TOPIC, COMPACTION_THRESHOLD); + } else { + log.info("Already set compaction on topic:{}, threshold:{} bytes", TOPIC, COMPACTION_THRESHOLD); + } + } catch (PulsarAdminException e) { + throw new PulsarServerException("Failed to schedule compaction.", e); + } + } + + public String getChannelOwner() { + validateChannel(); + CompletableFuture<Optional<LeaderBroker>> future = leaderElectionService.readCurrentLeader(); + if (!future.isDone()) { + return null; + } + Optional<LeaderBroker> leader = future.join(); + if (leader.isEmpty()) { + return null; + } + //expecting http://broker-xyz:port + // TODO: discard this protocol prefix removal by a util func that returns lookupServiceAddress(serviceUrl) + String broker = leader.get().getServiceUrl(); + broker = broker.substring(broker.lastIndexOf('/') + 1); + return broker; + } + + public boolean isChannelOwner() { + return isTargetBroker(getChannelOwner()); + } + + public CompletableFuture<String> getOwnerAsync(String serviceUnit) { + validateChannel(); + ServiceUnitStateData data = tableview.get(serviceUnit); + if (data == null) { + return null; + } + switch (data.state()) { + case Owned, Splitting -> { + return CompletableFuture.completedFuture(data.broker()); + } + case Assigned, Released -> { + return deferGetOwnerRequest(serviceUnit); + } + default -> { + return null; + } + } + } + + public CompletableFuture<String> publishAssignEventAsync(String serviceUnit, String broker) { + CompletableFuture<String> getOwnerRequest = deferGetOwnerRequest(serviceUnit); + pubAsync(serviceUnit, new ServiceUnitStateData(Assigned, broker)) + .whenComplete((__, ex) -> { + if (ex != null) { + getOwnerRequests.remove(serviceUnit); + if (!getOwnerRequest.isCompletedExceptionally()) { + getOwnerRequest.completeExceptionally(ex); + } + } + }); + + return getOwnerRequest; + } + + public CompletableFuture<Void> publishUnloadEventAsync(Unload unload) { + String serviceUnit = unload.serviceUnit(); + if (isTransferCommand(unload)) { + ServiceUnitStateData next = new ServiceUnitStateData(Assigned, Review Comment: Here should publish `Free` status? -- This is an automated message from the Apache Git Service. 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