序 本文主要研究一下debezium的SimpleSourceConnector from-my-sql-to-postgresql-using-kafkadebezium-18-638.jpg SimpleSourceConnector...debezium-v1.1.1.Final/debezium-embedded/src/main/java/io/debezium/connector/simple/SimpleSourceConnector.java...，其taskClass返回的是SimpleSourceConnector.SimpleConnectorTask.class SimpleConnectorTask debezium-v1.1.1.Final.../debezium-embedded/src/main/java/io/debezium/connector/simple/SimpleSourceConnector.java public static...，其taskClass返回的是SimpleSourceConnector.SimpleConnectorTask.class；SimpleConnectorTask继承了kafka的SourceTask
Introduction CDC（Change-Data-Capture）正被广泛应用于数据缓存、更新查询索引、创建派生视图、异构数据同步等场景，Debezium (https://debezium.io...数据库的事务日志往往会进行定期清理，这就导致了仅使用事务日志无法涵盖所有的历史数据信息，因此 Debezium 在进行事件流捕获前通常会执行 consistent snapshot（一致性快照） 以获取当前数据库中的完整数据...为了解决一致性快照的这些痛点问题，Debezium 提出了一个新的设计方案，并在 DDD-3 (https://github.com/debezium/debezium-design-documents...通常的事务日志中包含 create、update 和 delete 类型的事件，DBLog 对这些事件进行处理，最终包装为一种统一的格式输出，输出的结果将包含各 column 在事务发生时的状态（事务发生前后的值...总结 本文详细介绍了 Debezium 的 Incremental snapshot 的实现基础——DBLog，它在原有的 CDC 基础上使用一种基于 Watermark 的框架，扩展了 Full state
序 本文主要研究一下debezium的Heartbeat Heartbeat debezium-v1.1.1.Final/debezium-core/src/main/java/io/debezium/...} Heartbeat定义了OffsetProducer接口，该接口定义了offset方法；它还定义了heartbeat、forcedBeat、isEnabled方法 HeartbeatImpl debezium-v1.1.1....Final/debezium-core/src/main/java/io/debezium/heartbeat/HeartbeatImpl.java class HeartbeatImpl implements....Final/debezium-core/src/main/java/io/debezium/heartbeat/DatabaseHeartbeatImpl.java public class DatabaseHeartbeatImpl....Final/debezium-core/src/main/java/io/debezium/heartbeat/Heartbeat.java public interface Heartbeat {
序 本文主要研究一下debezium的BlockingReader Reader debezium-v1.1.1.Final/debezium-connector-mysql/src/main/java.../io/debezium/connector/mysql/Reader.java public interface Reader { public static enum State {....Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/BlockingReader.java public....Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/TimedBlockingReader.java public...TimedBlockingReader继承了BlockingReader，其start方法通过Threads.timer(Clock.SYSTEM, timeout)创建了Timer；其poll方法先执行父类的poll
序 本文主要研究一下debezium的eventHandlers handleInsert debezium-v1.1.1.Final/debezium-connector-mysql/src/main....Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/BinlogReader.java public class....Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/BinlogReader.java public class....Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/BinlogReader.java public class...，它们分别解析event对对应的data，对于增删改则执行recordMakers的对应方法，对于查询则作用对应的ddl语句 doc BinlogReader
序 本文主要研究一下debezium的OffsetCommitPolicy OIP (9).jpeg OffsetCommitPolicy debezium-v1.1.1.Final/debezium-api....Final/debezium-api/src/main/java/io/debezium/engine/spi/OffsetCommitPolicy.java public static class....Final/debezium-api/src/main/java/io/debezium/engine/spi/OffsetCommitPolicy.java public static class....Final/debezium-api/src/main/java/io/debezium/engine/DebeziumEngine.java public static interface...this); offsetWriter.cancelFlush(); } } //...... } EmbeddedEngine的buildRecordCommitter
序 本文主要研究一下debezium的Heartbeat OIP (6).jpeg Heartbeat debezium-v1.1.1.Final/debezium-core/src/main/java...} Heartbeat定义了OffsetProducer接口，该接口定义了offset方法；它还定义了heartbeat、forcedBeat、isEnabled方法 HeartbeatImpl debezium-v1.1.1....Final/debezium-core/src/main/java/io/debezium/heartbeat/HeartbeatImpl.java class HeartbeatImpl implements....Final/debezium-core/src/main/java/io/debezium/heartbeat/DatabaseHeartbeatImpl.java public class DatabaseHeartbeatImpl....Final/debezium-core/src/main/java/io/debezium/heartbeat/Heartbeat.java public interface Heartbeat {
序 本文主要研究一下debezium的ElapsedTimeStrategy from-my-sql-to-postgresql-using-kafkadebezium-23-638.jpg ElapsedTimeStrategy...debezium-v1.1.1.Final/debezium-core/src/main/java/io/debezium/util/ElapsedTimeStrategy.java @FunctionalInterface....Final/debezium-core/src/main/java/io/debezium/util/ElapsedTimeStrategy.java public static ElapsedTimeStrategy...debezium-core/src/main/java/io/debezium/util/ElapsedTimeStrategy.java public static ElapsedTimeStrategy...} return false; } }; } step接收stepFunction方法，其hasElapsed方法的初始
序 本文主要研究一下debezium的SnapshotChangeRecordEmitter capture-the-streams-of-database-changes-30-638.jpg SnapshotChangeRecordEmitter...debezium-v1.1.1.Final/debezium-core/src/main/java/io/debezium/relational/SnapshotChangeRecordEmitter.java....Final/debezium-core/src/main/java/io/debezium/relational/RelationalChangeRecordEmitter.java public abstract...执行不同的emit方法；这些emit方法主要是构造key及envelope，然后执行receiver.changeRecord AbstractChangeRecordEmitter debezium-v1.1.1....Final/debezium-core/src/main/java/io/debezium/pipeline/spi/ChangeRecordEmitter.java public interface
序 本文主要研究一下debezium的BlockingReader change-data-streaming-patterns-for-microservices-with-debezium-gunnar-morling-red-hat-kafka-summit-london...-2019-14-638.jpg Reader debezium-v1.1.1.Final/debezium-connector-mysql/src/main/java/io/debezium/connector....Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/BlockingReader.java public....Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/TimedBlockingReader.java public...TimedBlockingReader继承了BlockingReader，其start方法通过Threads.timer(Clock.SYSTEM, timeout)创建了Timer；其poll方法先执行父类的poll
序 本文主要研究一下debezium的SimpleSourceConnector SimpleSourceConnector debezium-v1.1.1.Final/debezium-embedded.../src/main/java/io/debezium/connector/simple/SimpleSourceConnector.java public class SimpleSourceConnector...，其taskClass返回的是SimpleSourceConnector.SimpleConnectorTask.class SimpleConnectorTask debezium-v1.1.1.Final.../debezium-embedded/src/main/java/io/debezium/connector/simple/SimpleSourceConnector.java public static...，其taskClass返回的是SimpleSourceConnector.SimpleConnectorTask.class；SimpleConnectorTask继承了kafka的SourceTask
序 本文主要研究一下debezium的ChangeEventQueue ChangeEventQueueMetrics debezium-v1.1.1.Final/debezium-core/src/main...} } //...... } LoggingContext定义了PreviousContext，其构造器使用MDC.getCopyOfContextMap()拷贝的当前的MDC...，其restore方法把之前拷贝的MDC数据再次设置到MDC中 Metronome debezium-v1.1.1.Final/debezium-core/src/main/java/io/debezium..." ms)"; } }; } //...... } Metronome接口定义了pause方法；它提供了sleeper静态方法用于创建匿名的Metronome...实现类，该实现类的pause方法通过Thread.sleep来实现pause 小结 ChangeEventQueue实现了ChangeEventQueueMetrics接口，其构造器创建了BlockingQueue
序 本文主要研究一下debezium的SnapshotChangeRecordEmitter SnapshotChangeRecordEmitter debezium-v1.1.1.Final/debezium-core....Final/debezium-core/src/main/java/io/debezium/relational/RelationalChangeRecordEmitter.java public abstract...执行不同的emit方法；这些emit方法主要是构造key及envelope，然后执行receiver.changeRecord AbstractChangeRecordEmitter debezium-v1.1.1....Final/debezium-core/src/main/java/io/debezium/pipeline/AbstractChangeRecordEmitter.java public abstract....Final/debezium-core/src/main/java/io/debezium/pipeline/spi/ChangeRecordEmitter.java public interface
序 本文主要研究一下debezium的eventHandlers from-my-sql-to-postgresql-using-kafkadebezium-18-638 (1).jpg handleInsert...debezium-v1.1.1.Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/BinlogReader.java....Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/BinlogReader.java public class....Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/BinlogReader.java public class...，它们分别解析event对对应的data，对于增删改则执行recordMakers的对应方法，对于查询则作用对应的ddl语句 doc BinlogReader
序 本文主要研究一下debezium的BinlogReader Reader debezium-v1.1.1.Final/debezium-connector-mysql/src/main/java/io.../debezium/connector/mysql/Reader.java public interface Reader { public static enum State {...throws InterruptedException; } Reader接口定义了name、state、uponCompletion、start、stop、poll方法 AbstractReader debezium-v1.1.1....Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/AbstractReader.java public....Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/BinlogReader.java public class
序 本文主要研究一下debezium的BinlogReader change-data-streaming-patterns-for-microservices-with-debezium-4-638....jpg Reader debezium-v1.1.1.Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql....Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/AbstractReader.java public....Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/BinlogReader.java public class...// Get the current GtidSet from MySQL so we can get a filtered/merged GtidSet based off of the last Debezium
序 本文主要研究一下debezium的ChangeEventQueue outbox_pattern.png ChangeEventQueueMetrics debezium-v1.1.1.Final.../debezium-core/src/main/java/io/debezium/connector/base/ChangeEventQueueMetrics.java public interface...} } //...... } LoggingContext定义了PreviousContext，其构造器使用MDC.getCopyOfContextMap()拷贝的当前的MDC...，其restore方法把之前拷贝的MDC数据再次设置到MDC中 Metronome debezium-v1.1.1.Final/debezium-core/src/main/java/io/debezium...实现类，该实现类的pause方法通过Thread.sleep来实现pause 小结 ChangeEventQueue实现了ChangeEventQueueMetrics接口，其构造器创建了BlockingQueue
序 本文主要研究一下debezium的RecordMakers OIP (8).jpeg RecordMakers debezium-v1.1.1.Final/debezium-connector-mysql....Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/RecordMakers.java public...includedColumns, ts, consumer); } } RecordsForTable提供了read、create、update、delete方法，它们都委托给converter的对应方法...Converter debezium-v1.1.1.Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/RecordMakers.java...RecordMakers提供了forTable方法，用于创建RecordsForTable；RecordsForTable提供了read、create、update、delete方法，它们都委托给converter的对应方法
序 本文主要研究一下debezium的RecordMakers RecordMakers debezium-v1.1.1.Final/debezium-connector-mysql/src/main/....Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/RecordMakers.java public...includedColumns, ts, consumer); } } RecordsForTable提供了read、create、update、delete方法，它们都委托给converter的对应方法...Converter debezium-v1.1.1.Final/debezium-connector-mysql/src/main/java/io/debezium/connector/mysql/RecordMakers.java...RecordMakers提供了forTable方法，用于创建RecordsForTable；RecordsForTable提供了read、create、update、delete方法，它们都委托给converter的对应方法
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