caozhen1937 commented on a change in pull request #13296: URL: https://github.com/apache/flink/pull/13296#discussion_r499217948
########## File path: flink-formats/flink-avro-confluent-registry/src/main/java/org/apache/flink/formats/avro/registry/confluent/debezium/DebeziumAvroSerializationSchema.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.formats.avro.registry.confluent.debezium; + +import org.apache.flink.api.common.serialization.SerializationSchema; +import org.apache.flink.formats.avro.AvroRowDataSerializationSchema; +import org.apache.flink.formats.avro.RowDataToAvroConverters; +import org.apache.flink.formats.avro.registry.confluent.ConfluentRegistryAvroSerializationSchema; +import org.apache.flink.formats.avro.typeutils.AvroSchemaConverter; +import org.apache.flink.table.api.DataTypes; +import org.apache.flink.table.data.GenericRowData; +import org.apache.flink.table.data.RowData; +import org.apache.flink.table.data.StringData; +import org.apache.flink.table.types.DataType; +import org.apache.flink.table.types.logical.RowType; +import org.apache.flink.types.RowKind; + +import java.util.Objects; + +import static org.apache.flink.table.types.utils.TypeConversions.fromLogicalToDataType; + +/** + * Serialization schema from Flink Table/SQL internal data structure {@link RowData} to Debezium Avro. + */ +public class DebeziumAvroSerializationSchema implements SerializationSchema<RowData> { + private static final long serialVersionUID = 1L; + + /** + * insert operation + */ + private static final StringData OP_CREATE = StringData.fromString("c"); + /** + * delete operation + */ + private static final StringData OP_DELETE = StringData.fromString("d"); + + /** + * The deserializer to deserialize Debezium Avro data. + */ + private final AvroRowDataSerializationSchema avroSerializer; + + private transient GenericRowData reuse = new GenericRowData(2); + + public DebeziumAvroSerializationSchema( + RowType rowType, + String schemaRegistryUrl, + String schemaRegistrySubject) { + RowType debeziumAvroRowType = createDebeziumAvroRowType(fromLogicalToDataType(rowType)); + + this.avroSerializer = new AvroRowDataSerializationSchema( + debeziumAvroRowType, + ConfluentRegistryAvroSerializationSchema.forGeneric( + schemaRegistrySubject, + AvroSchemaConverter.convertToSchema(debeziumAvroRowType), + schemaRegistryUrl), + RowDataToAvroConverters.createRowConverter(debeziumAvroRowType)); + } + + public DebeziumAvroSerializationSchema(AvroRowDataSerializationSchema avroSerializer) { + this.avroSerializer = avroSerializer; + } + + @Override + public void open(InitializationContext context) throws Exception { + } + + @Override + public byte[] serialize(RowData element) { + reuse.setField(0, element); + reuse.setField(1, rowKind2String(element.getRowKind())); + return avroSerializer.serialize(reuse); + } + + private StringData rowKind2String(RowKind rowKind) { + switch (rowKind) { + case INSERT: + case UPDATE_AFTER: + return OP_CREATE; + case UPDATE_BEFORE: + case DELETE: + return OP_DELETE; + default: + throw new UnsupportedOperationException("Unsupported operation '" + rowKind + "' for row kind."); + } + } + + @Override + public boolean equals(Object o) { + if (this == o) { + return true; + } + if (o == null || getClass() != o.getClass()) { + return false; + } + DebeziumAvroSerializationSchema that = (DebeziumAvroSerializationSchema) o; + return Objects.equals(avroSerializer, that.avroSerializer); + } + + @Override + public int hashCode() { + return Objects.hash(avroSerializer); + } + + public static RowType createDebeziumAvroRowType(DataType dataType) { + // Debezium Avro contains other information, e.g. "source", "ts_ms" + // but we don't need them + // and we don't need "before" , because can not support UPDATE_BEFORE,UPDATE_AFTER Review comment: @wuchong I found that when Using `canal-json`,`debezium-json`,`maxwell-json` serialization, the RowData of `DELETE` was not put `old` data into JSON message. I will open an issue to track it. ---------------------------------------------------------------- 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: us...@infra.apache.org
