nizhikov commented on a change in pull request #49: URL: https://github.com/apache/ignite-extensions/pull/49#discussion_r655285800
########## File path: modules/cdc-ext/src/main/java/org/apache/ignite/cdc/kafka/KafkaToIgniteCdcStreamer.java ########## @@ -0,0 +1,197 @@ +/* + * 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.ignite.cdc.kafka; + +import java.util.ArrayList; +import java.util.List; +import java.util.Objects; +import java.util.Properties; +import java.util.Set; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.ThreadFactory; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.atomic.AtomicInteger; +import java.util.stream.Collectors; +import org.apache.ignite.IgniteCheckedException; +import org.apache.ignite.IgniteException; +import org.apache.ignite.IgniteLogger; +import org.apache.ignite.Ignition; +import org.apache.ignite.cdc.ChangeDataCaptureEvent; +import org.apache.ignite.cdc.conflictresolve.CacheConflictResolutionManagerImpl; +import org.apache.ignite.cdc.conflictresolve.CacheVersionConflictResolverImpl; +import org.apache.ignite.configuration.IgniteConfiguration; +import org.apache.ignite.internal.IgniteEx; +import org.apache.ignite.internal.cdc.ChangeDataCapture; +import org.apache.ignite.internal.util.typedef.F; +import org.apache.ignite.internal.util.typedef.internal.CU; +import org.apache.ignite.internal.util.typedef.internal.U; +import org.apache.kafka.clients.consumer.ConsumerConfig; +import org.apache.kafka.common.serialization.ByteArrayDeserializer; +import org.apache.kafka.common.serialization.IntegerDeserializer; +import org.jetbrains.annotations.NotNull; + +import static org.apache.kafka.clients.consumer.ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG; +import static org.apache.kafka.clients.consumer.ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG; + +/** + * Main class of Kafka to Ignite application. + * This application is counterpart of {@link IgniteToKafkaCdcStreamer} Change Data Capture consumer. + * Application runs several {@link KafkaToIgniteCdcStreamerApplier} thread to read Kafka topic partitions + * and apply {@link ChangeDataCaptureEvent} to Ignite. + * <p> + * Each applier receive even number of kafka topic partition to read. + * <p> + * In case of any error during read applier just fail. Fail of any applier will lead to the fail of whole application. + * It expected that application will be configured for automatic restarts with the OS tool to failover temporary errors + * such as Kafka or Ignite unavailability. + * <p> + * To resolve possible update conflicts (in case of concurrent update in source and destination Ignite clusters) + * real-world deployments should use some conflict resolver, for example {@link CacheVersionConflictResolverImpl}. + * Example of Ignite configuration with the conflict resolver: + * <pre> + * {@code + * CacheVersionConflictResolverCachePluginProvider conflictPlugin = new CacheVersionConflictResolverCachePluginProvider(); + * + * conflictPlugin.setClusterId(clusterId); // Cluster id. + * conflictPlugin.setCaches(new HashSet<>(Arrays.asList("my-cache", "some-other-cache"))); // Caches to replicate. + * + * IgniteConfiguration cfg = ...; + * + * cfg.setPluginProviders(conflictPlugin); + * } + * </pre> + * Please, see {@link CacheConflictResolutionManagerImpl} for additional information. + * + * @see ChangeDataCapture + * @see IgniteToKafkaCdcStreamer + * @see ChangeDataCaptureEvent + * @see KafkaToIgniteCdcStreamerApplier + * @see CacheConflictResolutionManagerImpl + */ +public class KafkaToIgniteCdcStreamer implements Runnable { + /** Ignite configuration. */ + private final IgniteConfiguration igniteCfg; + + /** Kafka consumer properties. */ + private final Properties kafkaProps; + + /** Streamer configuration. */ + private final KafkaToIgniteCdcStreamerConfiguration streamerCfg; + + /** Executor service to run {@link KafkaToIgniteCdcStreamerApplier} instances. */ + private final ExecutorService execSvc; + + /** Appliers. */ + private final List<KafkaToIgniteCdcStreamerApplier> appliers; + + /** + * @param igniteCfg Ignite configuration. + * @param kafkaProps Kafka properties. + * @param streamerCfg Streamer configuration. + */ + public KafkaToIgniteCdcStreamer( + IgniteConfiguration igniteCfg, + Properties kafkaProps, + KafkaToIgniteCdcStreamerConfiguration streamerCfg + ) { + this.igniteCfg = igniteCfg; + this.kafkaProps = kafkaProps; + this.streamerCfg = streamerCfg; + + appliers = new ArrayList<>(streamerCfg.getThreadCount()); + + execSvc = Executors.newFixedThreadPool(streamerCfg.getThreadCount(), new ThreadFactory() { + private final AtomicInteger cntr = new AtomicInteger(); + + @Override public Thread newThread(@NotNull Runnable r) { + Thread th = new Thread(r); + + th.setName("applier-thread-" + cntr.getAndIncrement()); + + return th; + } + }); Review comment: Because we have convenient `ExecutorService`. -- This is an automated message from the Apache Git Service. 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