anton-vinogradov commented on a change in pull request #49: URL: https://github.com/apache/ignite-extensions/pull/49#discussion_r655230551
########## File path: modules/cdc-ext/src/main/java/org/apache/ignite/cdc/kafka/KafkaToIgniteCdcStreamerApplier.java ########## @@ -0,0 +1,357 @@ +/* + * 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.io.ByteArrayInputStream; +import java.io.IOException; +import java.io.ObjectInputStream; +import java.time.Duration; +import java.util.ArrayList; +import java.util.Collections; +import java.util.HashMap; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.Properties; +import java.util.Set; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.atomic.AtomicLong; +import org.apache.ignite.IgniteCheckedException; +import org.apache.ignite.IgniteLogger; +import org.apache.ignite.binary.BinaryObject; +import org.apache.ignite.cache.CacheEntryVersion; +import org.apache.ignite.cdc.ChangeDataCaptureEvent; +import org.apache.ignite.internal.IgniteEx; +import org.apache.ignite.internal.processors.cache.CacheObject; +import org.apache.ignite.internal.processors.cache.CacheObjectImpl; +import org.apache.ignite.internal.processors.cache.IgniteInternalCache; +import org.apache.ignite.internal.processors.cache.KeyCacheObject; +import org.apache.ignite.internal.processors.cache.KeyCacheObjectImpl; +import org.apache.ignite.internal.processors.cache.dr.GridCacheDrInfo; +import org.apache.ignite.internal.processors.cache.version.CacheVersionConflictResolver; +import org.apache.ignite.internal.processors.cache.version.GridCacheVersion; +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.S; +import org.apache.ignite.internal.util.typedef.internal.U; +import org.apache.kafka.clients.consumer.ConsumerRecord; +import org.apache.kafka.clients.consumer.ConsumerRecords; +import org.apache.kafka.clients.consumer.KafkaConsumer; +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.errors.WakeupException; + +/** + * Thread that polls message from the Kafka topic partitions and applies those messages to the Ignite caches. + * It expected that messages was written to the Kafka by the {@link IgniteToKafkaCdcStreamer} Change Data Capture consumer. + * <p> + * Each {@code Applier} receive set of Kafka topic partitions to read and caches to process. + * Applier creates consumer per partition because Kafka consumer reads not fair, + * consumer reads messages from specific partition while there is new messages in specific partition. + * See <a href= + * "https://cwiki.apache.org/confluence/display/KAFKA/KIP-387%3A+Fair+Message+Consumption+Across+Partitions+in+KafkaConsumer";>KIP-387</a> + * and <a href="https://issues.apache.org/jira/browse/KAFKA-3932";>KAFKA-3932</a> for further information. + * All consumers should belongs to the same consumer-group to ensure consistent reading. + * Applier polls messages from each consumer in round-robin fashion. + * <p> + * Messages applied to Ignite using {@link IgniteInternalCache#putAllConflict(Map)}, {@link IgniteInternalCache#removeAllConflict(Map)} + * these methods allows to provide {@link GridCacheVersion} of the entry to the Ignite so in case update conflicts they can be resolved + * by the {@link CacheVersionConflictResolver}. + * <p> + * In case of any error during read applier just fail. + * Fail of any applier will lead to the fail of {@link KafkaToIgniteCdcStreamer} 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. + * + * @see KafkaToIgniteCdcStreamer + * @see IgniteToKafkaCdcStreamer + * @see IgniteInternalCache#putAllConflict(Map) + * @see IgniteInternalCache#removeAllConflict(Map) + * @see CacheVersionConflictResolver + * @see GridCacheVersion + * @see ChangeDataCaptureEvent + * @see CacheEntryVersion + */ +class KafkaToIgniteCdcStreamerApplier implements Runnable, AutoCloseable { + /** */ + public static final int DFLT_REQ_TIMEOUT = 3; + + /** Ignite instance. */ + private final IgniteEx ign; + + /** Log. */ + private final IgniteLogger log; + + /** Closed flag. Shared between all appliers. */ + private final AtomicBoolean closed; + + /** Caches. */ + private final Map<Integer, IgniteInternalCache<BinaryObject, BinaryObject>> ignCaches = new HashMap<>(); + + /** Kafka properties. */ + private final Properties kafkaProps; + + /** Maximum batch size. */ + private final int maxBatchSize; + + /** Topic to read. */ + private final String topic; + + /** Lower kafka partition (inclusive). */ + private final int kafkaPartFrom; + + /** Higher kafka partition (exclusive). */ + private final int kafkaPartTo; Review comment: It's not obvious from naming that one is inclusive but another is exclusive. Lets, at least make both similar. ########## 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: ExecutorSerice for a single run looks overcomplicated to me. Why not just Thread.start/join? ########## File path: modules/cdc-ext/src/main/java/org/apache/ignite/cdc/kafka/KafkaToIgniteCdcStreamer.java ########## @@ -0,0 +1,181 @@ +/* + * 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.atomic.AtomicBoolean; +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 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; + + /** Runners to run {@link KafkaToIgniteCdcStreamerApplier} instances. */ + private final Thread[] runners; + + /** 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()); + runners = new Thread[streamerCfg.getThreadCount()]; + + if (!kafkaProps.containsKey(ConsumerConfig.GROUP_ID_CONFIG)) + throw new IllegalArgumentException("Kafka properties don't contains " + ConsumerConfig.GROUP_ID_CONFIG); + + kafkaProps.put(KEY_DESERIALIZER_CLASS_CONFIG, IntegerDeserializer.class.getName()); + kafkaProps.put(VALUE_DESERIALIZER_CLASS_CONFIG, ByteArrayDeserializer.class.getName()); + } + + /** {@inheritDoc} */ + @Override public void run() { + try (IgniteEx ign = (IgniteEx)Ignition.start(igniteCfg)) { + IgniteLogger log = U.initLogger(igniteCfg, "kafka-ignite-streamer"); + + AtomicBoolean closed = new AtomicBoolean(); + + Set<Integer> caches = null; + + if (!F.isEmpty(streamerCfg.getCaches())) { + caches = streamerCfg.getCaches().stream() + .peek(cache -> Objects.requireNonNull(ign.cache(cache), cache + " not exists!")) + .map(CU::cacheId).collect(Collectors.toSet()); + } + + int kafkaParts = streamerCfg.getKafkaPartitions(); + int threadCnt = streamerCfg.getThreadCount(); + int partPerApplier = kafkaParts / threadCnt; + + for (int i = 0; i < threadCnt; i++) { + int from = i * partPerApplier; + int to = (i + 1) * partPerApplier; + + if (i == threadCnt - 1) + to = kafkaParts + 1; + + KafkaToIgniteCdcStreamerApplier applier = new KafkaToIgniteCdcStreamerApplier( + ign, + log, + kafkaProps, + streamerCfg.getTopic(), + from, + to, + caches, + streamerCfg.getMaxBatchSize(), + closed + ); + + appliers.add(applier); + + runners[i] = new Thread(applier, "applier-thread-" + i); + + runners[i].start(); + } + + try { + for (int i = 0; i < threadCnt; i ++) + runners[i].join(); + } + catch (InterruptedException e) { + closed.set(true); Review comment: `stopped` seems to be more suitable. ########## File path: modules/cdc-ext/src/main/java/org/apache/ignite/cdc/CdcEventsApplier.java ########## @@ -0,0 +1,160 @@ +/* + * 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; + +import java.util.HashMap; +import java.util.Map; +import java.util.function.BooleanSupplier; +import org.apache.ignite.IgniteCheckedException; +import org.apache.ignite.IgniteLogger; +import org.apache.ignite.binary.BinaryObject; +import org.apache.ignite.cache.CacheEntryVersion; +import org.apache.ignite.internal.IgniteEx; +import org.apache.ignite.internal.processors.cache.CacheObject; +import org.apache.ignite.internal.processors.cache.CacheObjectImpl; +import org.apache.ignite.internal.processors.cache.IgniteInternalCache; +import org.apache.ignite.internal.processors.cache.KeyCacheObject; +import org.apache.ignite.internal.processors.cache.KeyCacheObjectImpl; +import org.apache.ignite.internal.processors.cache.dr.GridCacheDrInfo; +import org.apache.ignite.internal.processors.cache.version.GridCacheVersion; +import org.apache.ignite.internal.util.typedef.F; +import org.apache.ignite.internal.util.typedef.internal.CU; + +/** + * Contains logic to process {@link ChangeDataCaptureEvent} and apply them to the provided by {@link #ignite()} cluster. + */ +public abstract class CdcEventsApplier { + /** Maximum batch size. */ + private final int maxBatchSize; + + /** Caches. */ + private final Map<Integer, IgniteInternalCache<BinaryObject, BinaryObject>> ignCaches = new HashMap<>(); + + /** Update batch. */ + private final Map<KeyCacheObject, GridCacheDrInfo> updBatch = new HashMap<>(); + + /** Remove batch. */ + private final Map<KeyCacheObject, GridCacheVersion> rmvBatch = new HashMap<>(); + + /** */ + private final BooleanSupplier hasUpdates = () -> !F.isEmpty(updBatch); + + /** */ + private final BooleanSupplier hasRemoves = () -> !F.isEmpty(rmvBatch); + + /** + * @param maxBatchSize Maximum batch size. + */ + public CdcEventsApplier(int maxBatchSize) { + this.maxBatchSize = maxBatchSize; + } + + /** + * @param evts Events to process. + * @throws IgniteCheckedException If failed. + */ + protected void apply(Iterable<ChangeDataCaptureEvent> evts) throws IgniteCheckedException { + IgniteInternalCache<BinaryObject, BinaryObject> currCache = null; + + for (ChangeDataCaptureEvent evt : evts) { + IgniteInternalCache<BinaryObject, BinaryObject> cache = ignCaches.computeIfAbsent(evt.cacheId(), cacheId -> { + for (String cacheName : ignite().cacheNames()) { + if (CU.cacheId(cacheName) == cacheId) { + // IgniteEx#cachex(String) will return null if cache not initialized with regular Ignite#cache(String) call. + ignite().cache(cacheName); + + return ignite().cachex(cacheName); + } + } + + throw new IllegalStateException("Cache with id not found [cacheId=" + cacheId + ']'); + }); + + if (cache != currCache) { + applyIf(currCache, hasUpdates, hasRemoves); + + currCache = cache; + } + + CacheEntryVersion order = evt.version(); + + KeyCacheObject key = new KeyCacheObjectImpl(evt.key(), null, evt.partition()); + + if (evt.value() != null) { + applyIf(currCache, () -> isApplyBatch(updBatch, key), hasRemoves); + + CacheObject val = new CacheObjectImpl(evt.value(), null); + + updBatch.put(key, new GridCacheDrInfo(val, + new GridCacheVersion(order.topologyVersion(), order.order(), order.nodeOrder(), order.clusterId()))); + } + else { + applyIf(currCache, hasUpdates, () -> isApplyBatch(rmvBatch, key)); + + rmvBatch.put(key, + new GridCacheVersion(order.topologyVersion(), order.order(), order.nodeOrder(), order.clusterId())); + } + } + + if (currCache != null) + applyIf(currCache, hasUpdates, hasRemoves); + } + + /** + * Applies data from {@code updMap} or {@code rmvBatch} to Ignite if required. Review comment: What is `updMap`? Frefactoring unfriendly comment found ) ########## File path: modules/cdc-ext/src/main/java/org/apache/ignite/cdc/kafka/KafkaToIgniteCdcStreamer.java ########## @@ -0,0 +1,181 @@ +/* + * 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.atomic.AtomicBoolean; +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 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; + + /** Runners to run {@link KafkaToIgniteCdcStreamerApplier} instances. */ + private final Thread[] runners; + + /** 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()); + runners = new Thread[streamerCfg.getThreadCount()]; + + if (!kafkaProps.containsKey(ConsumerConfig.GROUP_ID_CONFIG)) + throw new IllegalArgumentException("Kafka properties don't contains " + ConsumerConfig.GROUP_ID_CONFIG); + + kafkaProps.put(KEY_DESERIALIZER_CLASS_CONFIG, IntegerDeserializer.class.getName()); + kafkaProps.put(VALUE_DESERIALIZER_CLASS_CONFIG, ByteArrayDeserializer.class.getName()); + } + + /** {@inheritDoc} */ + @Override public void run() { + try (IgniteEx ign = (IgniteEx)Ignition.start(igniteCfg)) { + IgniteLogger log = U.initLogger(igniteCfg, "kafka-ignite-streamer"); + + AtomicBoolean closed = new AtomicBoolean(); + + Set<Integer> caches = null; + + if (!F.isEmpty(streamerCfg.getCaches())) { + caches = streamerCfg.getCaches().stream() + .peek(cache -> Objects.requireNonNull(ign.cache(cache), cache + " not exists!")) + .map(CU::cacheId).collect(Collectors.toSet()); + } + + int kafkaParts = streamerCfg.getKafkaPartitions(); + int threadCnt = streamerCfg.getThreadCount(); + int partPerApplier = kafkaParts / threadCnt; + + for (int i = 0; i < threadCnt; i++) { + int from = i * partPerApplier; + int to = (i + 1) * partPerApplier; + + if (i == threadCnt - 1) + to = kafkaParts + 1; + + KafkaToIgniteCdcStreamerApplier applier = new KafkaToIgniteCdcStreamerApplier( + ign, + log, + kafkaProps, + streamerCfg.getTopic(), + from, + to, + caches, + streamerCfg.getMaxBatchSize(), + closed + ); + + appliers.add(applier); + + runners[i] = new Thread(applier, "applier-thread-" + i); + + runners[i].start(); + } + + try { + for (int i = 0; i < threadCnt; i ++) + runners[i].join(); + } + catch (InterruptedException e) { Review comment: seems we're losing the reason here? ########## File path: modules/cdc-ext/src/main/java/org/apache/ignite/cdc/kafka/KafkaToIgniteCdcStreamerApplier.java ########## @@ -0,0 +1,253 @@ +/* + * 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.io.ByteArrayInputStream; +import java.io.IOException; +import java.io.ObjectInputStream; +import java.time.Duration; +import java.util.ArrayList; +import java.util.Collections; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.Properties; +import java.util.Set; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.atomic.AtomicLong; +import org.apache.ignite.IgniteCheckedException; +import org.apache.ignite.IgniteException; +import org.apache.ignite.IgniteLogger; +import org.apache.ignite.cache.CacheEntryVersion; +import org.apache.ignite.cdc.ChangeDataCaptureEvent; +import org.apache.ignite.cdc.CdcEventsApplier; +import org.apache.ignite.internal.IgniteEx; +import org.apache.ignite.internal.processors.cache.IgniteInternalCache; +import org.apache.ignite.internal.processors.cache.version.CacheVersionConflictResolver; +import org.apache.ignite.internal.processors.cache.version.GridCacheVersion; +import org.apache.ignite.internal.util.typedef.F; +import org.apache.ignite.internal.util.typedef.internal.S; +import org.apache.ignite.internal.util.typedef.internal.U; +import org.apache.kafka.clients.consumer.ConsumerRecord; +import org.apache.kafka.clients.consumer.ConsumerRecords; +import org.apache.kafka.clients.consumer.KafkaConsumer; +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.errors.WakeupException; + +/** + * Thread that polls message from the Kafka topic partitions and applies those messages to the Ignite caches. + * It expected that messages was written to the Kafka by the {@link IgniteToKafkaCdcStreamer} Change Data Capture consumer. + * <p> + * Each {@code Applier} receive set of Kafka topic partitions to read and caches to process. + * Applier creates consumer per partition because Kafka consumer reads not fair, + * consumer reads messages from specific partition while there is new messages in specific partition. + * See <a href= + * "https://cwiki.apache.org/confluence/display/KAFKA/KIP-387%3A+Fair+Message+Consumption+Across+Partitions+in+KafkaConsumer";>KIP-387</a> + * and <a href="https://issues.apache.org/jira/browse/KAFKA-3932";>KAFKA-3932</a> for further information. + * All consumers should belongs to the same consumer-group to ensure consistent reading. + * Applier polls messages from each consumer in round-robin fashion. + * <p> + * Messages applied to Ignite using {@link IgniteInternalCache#putAllConflict(Map)}, {@link IgniteInternalCache#removeAllConflict(Map)} + * these methods allows to provide {@link GridCacheVersion} of the entry to the Ignite so in case update conflicts they can be resolved + * by the {@link CacheVersionConflictResolver}. + * <p> + * In case of any error during read applier just fail. + * Fail of any applier will lead to the fail of {@link KafkaToIgniteCdcStreamer} 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. + * + * @see KafkaToIgniteCdcStreamer + * @see IgniteToKafkaCdcStreamer + * @see IgniteInternalCache#putAllConflict(Map) + * @see IgniteInternalCache#removeAllConflict(Map) + * @see CacheVersionConflictResolver + * @see GridCacheVersion + * @see ChangeDataCaptureEvent + * @see CacheEntryVersion + */ +class KafkaToIgniteCdcStreamerApplier extends CdcEventsApplier implements Runnable, AutoCloseable { + /** */ + public static final int DFLT_REQ_TIMEOUT = 3; + + /** Ignite instance. */ + private final IgniteEx ign; + + /** Log. */ + private final IgniteLogger log; + + /** Closed flag. Shared between all appliers. */ + private final AtomicBoolean closed; + + /** Kafka properties. */ + private final Properties kafkaProps; + + /** Topic to read. */ + private final String topic; + + /** Lower kafka partition (inclusive). */ + private final int kafkaPartFrom; + + /** Higher kafka partition (exclusive). */ + private final int kafkaPartTo; + + /** Caches ids to read. */ + private final Set<Integer> caches; + + /** Consumers. */ + private final List<KafkaConsumer<Integer, byte[]>> cnsmrs = new ArrayList<>(); + + /** */ + private final AtomicLong rcvdEvts = new AtomicLong(); + + /** + * @param ign Ignite instance. + * @param log Logger. + * @param kafkaProps Kafka properties. + * @param topic Topic name. + * @param kafkaPartFrom Read from partition. + * @param kafkaPartTo Read to partition. + * @param caches Cache ids. + * @param maxBatchSize Maximum batch size. + * @param closed Closed flag. + */ + public KafkaToIgniteCdcStreamerApplier( + IgniteEx ign, + IgniteLogger log, + Properties kafkaProps, + String topic, + int kafkaPartFrom, + int kafkaPartTo, + Set<Integer> caches, + int maxBatchSize, + AtomicBoolean closed + ) { + super(maxBatchSize); + + this.ign = ign; + this.kafkaProps = kafkaProps; + this.topic = topic; + this.kafkaPartFrom = kafkaPartFrom; + this.kafkaPartTo = kafkaPartTo; + this.caches = caches; + this.closed = closed; + this.log = log.getLogger(KafkaToIgniteCdcStreamerApplier.class); + } + + /** {@inheritDoc} */ + @Override public void run() { + U.setCurrentIgniteName(ign.name()); + + try { + for (int kafkaPart = kafkaPartFrom; kafkaPart < kafkaPartTo; kafkaPart++) { + KafkaConsumer<Integer, byte[]> cnsmr = new KafkaConsumer<>(kafkaProps); + + cnsmr.assign(Collections.singleton(new TopicPartition(topic, kafkaPart))); + + cnsmrs.add(cnsmr); + } + + Iterator<KafkaConsumer<Integer, byte[]>> cnsmrIter = Collections.emptyIterator(); + + while (!closed.get()) { + if (!cnsmrIter.hasNext()) + cnsmrIter = cnsmrs.iterator(); + + poll(cnsmrIter.next()); + } + } + catch (WakeupException e) { + if (!closed.get()) + log.error("Applier wakeup error!", e); + } + catch (Throwable e) { + log.error("Applier error!", e); + + closed.set(true); Review comment: all other appliers should be waked up as well. ########## File path: modules/cdc-ext/src/main/java/org/apache/ignite/cdc/kafka/KafkaToIgniteCdcStreamer.java ########## @@ -0,0 +1,181 @@ +/* + * 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.atomic.AtomicBoolean; +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 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; + + /** Runners to run {@link KafkaToIgniteCdcStreamerApplier} instances. */ + private final Thread[] runners; + + /** 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()); + runners = new Thread[streamerCfg.getThreadCount()]; + + if (!kafkaProps.containsKey(ConsumerConfig.GROUP_ID_CONFIG)) + throw new IllegalArgumentException("Kafka properties don't contains " + ConsumerConfig.GROUP_ID_CONFIG); + + kafkaProps.put(KEY_DESERIALIZER_CLASS_CONFIG, IntegerDeserializer.class.getName()); + kafkaProps.put(VALUE_DESERIALIZER_CLASS_CONFIG, ByteArrayDeserializer.class.getName()); + } + + /** {@inheritDoc} */ + @Override public void run() { + try (IgniteEx ign = (IgniteEx)Ignition.start(igniteCfg)) { + IgniteLogger log = U.initLogger(igniteCfg, "kafka-ignite-streamer"); + + AtomicBoolean closed = new AtomicBoolean(); + + Set<Integer> caches = null; + + if (!F.isEmpty(streamerCfg.getCaches())) { + caches = streamerCfg.getCaches().stream() + .peek(cache -> Objects.requireNonNull(ign.cache(cache), cache + " not exists!")) + .map(CU::cacheId).collect(Collectors.toSet()); + } + + int kafkaParts = streamerCfg.getKafkaPartitions(); + int threadCnt = streamerCfg.getThreadCount(); + int partPerApplier = kafkaParts / threadCnt; + + for (int i = 0; i < threadCnt; i++) { + int from = i * partPerApplier; + int to = (i + 1) * partPerApplier; + + if (i == threadCnt - 1) + to = kafkaParts + 1; + + KafkaToIgniteCdcStreamerApplier applier = new KafkaToIgniteCdcStreamerApplier( + ign, + log, + kafkaProps, + streamerCfg.getTopic(), + from, + to, + caches, + streamerCfg.getMaxBatchSize(), + closed + ); + + appliers.add(applier); + + runners[i] = new Thread(applier, "applier-thread-" + i); + + runners[i].start(); + } + + try { + for (int i = 0; i < threadCnt; i ++) + runners[i].join(); + } + catch (InterruptedException e) { + closed.set(true); + + appliers.forEach(U::closeQuiet); Review comment: any reason to call the method which sets `closed.set(true);` line after it set? %) -- This is an automated message from the Apache Git Service. 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