loserwang1024 commented on code in PR #3442: URL: https://github.com/apache/flink-cdc/pull/3442#discussion_r1664979827
########## flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-postgres/src/main/java/org/apache/flink/cdc/connectors/postgres/source/PostgresEventDeserializer.java: ########## @@ -0,0 +1,90 @@ +/* + * 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.flink.cdc.connectors.postgres.source; + +import org.apache.flink.cdc.common.annotation.Internal; +import org.apache.flink.cdc.common.event.SchemaChangeEvent; +import org.apache.flink.cdc.common.event.TableId; +import org.apache.flink.cdc.debezium.event.DebeziumEventDeserializationSchema; +import org.apache.flink.cdc.debezium.event.DebeziumSchemaDataTypeInference; +import org.apache.flink.cdc.debezium.table.DebeziumChangelogMode; + +import com.fasterxml.jackson.databind.ObjectMapper; +import io.debezium.data.Envelope; +import io.debezium.relational.Tables; +import org.apache.kafka.connect.data.Schema; +import org.apache.kafka.connect.data.Struct; +import org.apache.kafka.connect.source.SourceRecord; + +import java.util.Collections; +import java.util.List; +import java.util.Map; + +/** Event deserializer for {@link PostgresDataSource}. */ +@Internal +public class PostgresEventDeserializer extends DebeziumEventDeserializationSchema { + + private static final long serialVersionUID = 1L; + + public static final String SCHEMA_CHANGE_EVENT_KEY_NAME = + "io.debezium.connector.postgres.SchemaChangeKey"; + + private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper(); + + private final boolean includeSchemaChanges; + + private transient Tables tables; + + public PostgresEventDeserializer( + DebeziumChangelogMode changelogMode, boolean includeSchemaChanges) { + super(new DebeziumSchemaDataTypeInference(), changelogMode); + this.includeSchemaChanges = includeSchemaChanges; + } + + @Override + protected List<SchemaChangeEvent> deserializeSchemaChangeRecord(SourceRecord record) { + return Collections.emptyList(); + } + + @Override + protected boolean isDataChangeRecord(SourceRecord record) { + Schema valueSchema = record.valueSchema(); + Struct value = (Struct) record.value(); + return value != null + && valueSchema != null + && valueSchema.field(Envelope.FieldName.OPERATION) != null + && value.getString(Envelope.FieldName.OPERATION) != null; + } + + @Override + protected boolean isSchemaChangeRecord(SourceRecord record) { + Schema keySchema = record.keySchema(); Review Comment: Does postgres have schema change record? ########## flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-postgres/src/main/java/org/apache/flink/cdc/connectors/postgres/source/reader/PostgresPipelineRecordEmitter.java: ########## @@ -0,0 +1,129 @@ +/* + * 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.flink.cdc.connectors.postgres.source.reader; + +import org.apache.flink.api.connector.source.SourceOutput; +import org.apache.flink.cdc.common.event.CreateTableEvent; +import org.apache.flink.cdc.common.event.Event; +import org.apache.flink.cdc.common.schema.Schema; +import org.apache.flink.cdc.connectors.base.options.StartupMode; +import org.apache.flink.cdc.connectors.base.source.meta.offset.OffsetFactory; +import org.apache.flink.cdc.connectors.base.source.meta.split.SourceSplitState; +import org.apache.flink.cdc.connectors.base.source.metrics.SourceReaderMetrics; +import org.apache.flink.cdc.connectors.base.source.reader.IncrementalSourceRecordEmitter; +import org.apache.flink.cdc.connectors.postgres.source.PostgresDialect; +import org.apache.flink.cdc.connectors.postgres.source.config.PostgresSourceConfig; +import org.apache.flink.cdc.connectors.postgres.source.utils.TableDiscoveryUtils; +import org.apache.flink.cdc.connectors.postgres.utils.PostgresSchemaUtils; +import org.apache.flink.cdc.debezium.DebeziumDeserializationSchema; +import org.apache.flink.connector.base.source.reader.RecordEmitter; + +import io.debezium.connector.postgresql.connection.PostgresConnection; +import io.debezium.relational.TableId; +import org.apache.kafka.connect.source.SourceRecord; + +import java.sql.SQLException; +import java.util.ArrayList; +import java.util.HashSet; +import java.util.List; +import java.util.Set; + +import static org.apache.flink.cdc.connectors.base.source.meta.wartermark.WatermarkEvent.isLowWatermarkEvent; + +/** The {@link RecordEmitter} implementation for pipeline oracle connector. */ +public class PostgresPipelineRecordEmitter<T> extends IncrementalSourceRecordEmitter<T> { + private final PostgresSourceConfig sourceConfig; + private final PostgresDialect postgresDialect; + + // Used when startup mode is initial + private Set<TableId> alreadySendCreateTableTables; + + // Used when startup mode is not initial + private boolean alreadySendCreateTableForBinlogSplit = false; + private final List<CreateTableEvent> createTableEventCache; + + public PostgresPipelineRecordEmitter( + DebeziumDeserializationSchema debeziumDeserializationSchema, + SourceReaderMetrics sourceReaderMetrics, + PostgresSourceConfig sourceConfig, + OffsetFactory offsetFactory, + PostgresDialect postgresDialect) { + super( + debeziumDeserializationSchema, + sourceReaderMetrics, + sourceConfig.isIncludeSchemaChanges(), + offsetFactory); + this.sourceConfig = sourceConfig; + this.postgresDialect = postgresDialect; + this.alreadySendCreateTableTables = new HashSet<>(); + this.createTableEventCache = new ArrayList<>(); + + if (!sourceConfig.getStartupOptions().startupMode.equals(StartupMode.INITIAL)) { + try (PostgresConnection jdbc = postgresDialect.openJdbcConnection()) { + List<TableId> capturedTableIds = + TableDiscoveryUtils.listTables( + sourceConfig.getDatabaseList().get(0), + jdbc, + sourceConfig.getTableFilters()); + for (TableId tableId : capturedTableIds) { + Schema schema = PostgresSchemaUtils.getTableSchema(tableId, sourceConfig, jdbc); + createTableEventCache.add( + new CreateTableEvent( + org.apache.flink.cdc.common.event.TableId.tableId( + tableId.schema(), tableId.table()), + schema)); + } + } catch (SQLException e) { + throw new RuntimeException("Cannot start emitter to fetch table schema.", e); + } + } + } + + @Override + protected void processElement( + SourceRecord element, SourceOutput<T> output, SourceSplitState splitState) + throws Exception { + if (isLowWatermarkEvent(element) && splitState.isSnapshotSplitState()) { + TableId tableId = splitState.asSnapshotSplitState().toSourceSplit().getTableId(); + if (!alreadySendCreateTableTables.contains(tableId)) { + try (PostgresConnection jdbc = postgresDialect.openJdbcConnection()) { + sendCreateTableEvent(jdbc, tableId, (SourceOutput<Event>) output); + alreadySendCreateTableTables.add(tableId); + } + } + } else if (splitState.isStreamSplitState() + && !alreadySendCreateTableForBinlogSplit + && !sourceConfig.getStartupOptions().startupMode.equals(StartupMode.INITIAL)) { + for (CreateTableEvent createTableEvent : createTableEventCache) { + output.collect((T) createTableEvent); + } + alreadySendCreateTableForBinlogSplit = true; + } + super.processElement(element, output, splitState); + } + + private void sendCreateTableEvent( + PostgresConnection jdbc, TableId tableId, SourceOutput<Event> output) { + Schema schema = PostgresSchemaUtils.getTableSchema(tableId, sourceConfig, jdbc); Review Comment: What if log's schema is different with current table schema? -- This is an automated message from the Apache Git Service. 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