jberragan commented on code in PR #294: URL: https://github.com/apache/cassandra-sidecar/pull/294#discussion_r2636994132
########## server/src/main/java/org/apache/cassandra/sidecar/cdc/CdcManager.java: ########## @@ -0,0 +1,282 @@ +/* + * 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.cassandra.sidecar.cdc; + +import java.io.IOException; +import java.net.InetAddress; +import java.net.UnknownHostException; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.stream.Collectors; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import org.apache.cassandra.cdc.api.CdcOptions; +import org.apache.cassandra.cdc.api.EventConsumer; +import org.apache.cassandra.cdc.api.SchemaSupplier; +import org.apache.cassandra.cdc.api.TokenRangeSupplier; +import org.apache.cassandra.cdc.sidecar.CdcSidecarInstancesProvider; +import org.apache.cassandra.cdc.sidecar.ClusterConfigProvider; +import org.apache.cassandra.cdc.sidecar.SidecarCdc; +import org.apache.cassandra.cdc.sidecar.SidecarCdcClient; +import org.apache.cassandra.cdc.sidecar.SidecarCdcStats; +import org.apache.cassandra.cdc.sidecar.SidecarStatePersister; +import org.apache.cassandra.cdc.stats.ICdcStats; +import org.apache.cassandra.secrets.SecretsProvider; +import org.apache.cassandra.sidecar.cluster.instance.InstanceMetadata; +import org.apache.cassandra.sidecar.common.server.cluster.locator.TokenRange; +import org.apache.cassandra.sidecar.concurrent.TaskExecutorPool; +import org.apache.cassandra.sidecar.coordination.RangeManager; +import org.apache.cassandra.sidecar.db.CdcDatabaseAccessor; +import org.apache.cassandra.sidecar.utils.InstanceMetadataFetcher; +import org.apache.cassandra.spark.utils.AsyncExecutor; +import org.jetbrains.annotations.NotNull; + + +/** + * Manages the lifecycle and coordination of CDC (Change Data Capture) consumers for processing + * Cassandra change events across distributed token ranges. + * + * <p>This class is responsible for: + * <ul> + * <li>Building and configuring {@link SidecarCdc} consumers based on owned token ranges</li> + * <li>Deduplicating consumers by instance ID and token range to prevent duplicate processing</li> + * <li>Managing consumer lifecycle (start/stop operations)</li> + * <li>Integrating with various providers for cluster configuration, schema, and instance metadata</li> + * <li>Coordinating with the range manager to determine token ownership</li> + * </ul> + * + * <p>The CDC consumers created by this manager process change events from Cassandra commit logs + * and forward them to configured event consumers (such as Kafka producers) while maintaining + * state persistence and proper token range distribution across the cluster. + * + * @see SidecarCdc + * @see EventConsumer + * @see RangeManager + * @see CdcConfig + */ +public class CdcManager +{ + private static final Logger LOGGER = LoggerFactory.getLogger(CdcManager.class); + private final CdcConfig conf; + private final RangeManager rangeManager; + private final InstanceMetadataFetcher instanceFetcher; + private final EventConsumer eventConsumer; + private final SchemaSupplier schemaSupplier; + private final ClusterConfigProvider clusterConfigProvider; + private final CdcSidecarInstancesProvider sidecarInstancesProvider; + private final SecretsProvider secretsProvider; + private final SidecarCdcClient.ClientConfig clientConfig; + private final ICdcStats cdcStats; + private List<SidecarCdc> consumers = new ArrayList<>(); + private final TaskExecutorPool taskExecutorPool; + private final CdcDatabaseAccessor cdcDatabaseAccessor; + + + public CdcManager(EventConsumer eventConsumer, + SchemaSupplier schemaSupplier, + CdcConfig conf, + RangeManager rangeManager, + InstanceMetadataFetcher instanceFetcher, + ClusterConfigProvider clusterConfigProvider, + CdcSidecarInstancesProvider sidecarInstancesProvider, + SecretsProvider secretsProvider, + SidecarCdcClient.ClientConfig clientConfig, + ICdcStats cdcStats, + TaskExecutorPool taskExecutorPool, + CdcDatabaseAccessor cdcDatabaseAccessor) + { + this.eventConsumer = eventConsumer; + this.schemaSupplier = schemaSupplier; + this.conf = conf; + this.rangeManager = rangeManager; + this.instanceFetcher = instanceFetcher; + this.clusterConfigProvider = clusterConfigProvider; + this.sidecarInstancesProvider = sidecarInstancesProvider; + this.secretsProvider = secretsProvider; + this.clientConfig = clientConfig; + this.cdcStats = cdcStats; + this.taskExecutorPool = taskExecutorPool; + this.cdcDatabaseAccessor = cdcDatabaseAccessor; + } + + List<SidecarCdc> buildCdcConsumers() + { + Map<String, Set<TokenRange>> ownedRanges = rangeManager.ownedTokenRanges(); + if (ownedRanges == null || ownedRanges.isEmpty()) + { + throw new IllegalStateException("No owned token ranges right now, cql session may still be initializing."); + } + + // NEW: Deduplicate by (instanceId, tokenRange) to prevent duplicate consumers + Map<String, SidecarCdc> uniqueConsumers = new HashMap<>(); Review Comment: ```suggestion Map<String, SidecarCdc> uniqueConsumers = new HashMap<>(ownedRanges.values().stream().mapToInt(Set::size).sum()); 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