Mmuzaf commented on a change in pull request #8909: URL: https://github.com/apache/ignite/pull/8909#discussion_r601767392
########## File path: modules/core/src/main/java/org/apache/ignite/internal/cdc/IgniteCDC.java ########## @@ -0,0 +1,485 @@ +/* + * 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.internal.cdc; + +import java.io.File; +import java.io.IOException; +import java.io.Serializable; +import java.nio.file.Files; +import java.nio.file.Path; +import java.nio.file.Paths; +import java.util.ArrayList; +import java.util.Comparator; +import java.util.HashSet; +import java.util.Iterator; +import java.util.List; +import java.util.Set; +import java.util.UUID; +import java.util.function.Predicate; +import java.util.stream.Stream; +import org.apache.ignite.IgniteCheckedException; +import org.apache.ignite.IgniteException; +import org.apache.ignite.IgniteLogger; +import org.apache.ignite.cdc.CaptureDataChangeConfiguration; +import org.apache.ignite.cdc.CaptureDataChangeConsumer; +import org.apache.ignite.cdc.ChangeEvent; +import org.apache.ignite.configuration.DataStorageConfiguration; +import org.apache.ignite.configuration.IgniteConfiguration; +import org.apache.ignite.internal.IgnitionEx; +import org.apache.ignite.internal.MarshallerContextImpl; +import org.apache.ignite.internal.pagemem.wal.WALIterator; +import org.apache.ignite.internal.processors.cache.binary.CacheObjectBinaryProcessorImpl; +import org.apache.ignite.internal.processors.cache.persistence.filename.PdsConsistentIdProcessor; +import org.apache.ignite.internal.processors.cache.persistence.wal.WALPointer; +import org.apache.ignite.internal.processors.cache.persistence.wal.reader.IgniteWalIteratorFactory; +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.ignite.lang.IgniteBiTuple; + +import static org.apache.ignite.configuration.DataStorageConfiguration.DFLT_CDC_PATH; +import static org.apache.ignite.internal.pagemem.wal.record.WALRecord.RecordType.DATA_RECORD_V2; +import static org.apache.ignite.internal.processors.cache.persistence.filename.PdsConsistentIdProcessor.NODE_PATTERN; +import static org.apache.ignite.internal.processors.cache.persistence.filename.PdsConsistentIdProcessor.UUID_STR_PATTERN; +import static org.apache.ignite.internal.processors.cache.persistence.wal.FileWriteAheadLogManager.WAL_NAME_PATTERN; + +/** + * CDC(Capture Data Change) application. + * Application run independently of Ignite node process and provide ability for the {@link CaptureDataChangeConsumer} to consume events({@link ChangeEvent}) from WAL segments. + * User should responsible {@link CaptureDataChangeConsumer} implementation with custom consumption logic. + * + * Ignite node should be explicitly configured for using {@link IgniteCDC}. + * <ol> + * <li>Set {@link DataStorageConfiguration#setCdcEnabled(boolean)} to true.</li> + * <li>Optional: Set {@link DataStorageConfiguration#setCdcPath(String)} to path to the directory to store WAL setgments for CDC.</li> + * <li>Optional: Set {@link DataStorageConfiguration#setWalForceArchiveTimeout(long)} to configure timeout for force WAL rollover, + * so new events will be available for consumptions with the predicted time.</li> + * </ol> + * + * When {@link DataStorageConfiguration#getCdcPath()} is true then Ignite node on each WAL segment rollover creates hard link + * to archive WAL segment in {@link DataStorageConfiguration#getCdcPath()} directory. + * {@link IgniteCDC} application takes segment file and consumes events from it. After successfull consumption (see {@link CaptureDataChangeConsumer#onChange(Iterator)}) + * WAL segement will be deleted from directory. Review comment: segement > segment -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
