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Kafka debezium json supports automatic discovery of primary keys
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...ain/java/org/apache/paimon/flink/action/cdc/kafka/KafkaKeyValueDeserializationSchema.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.paimon.flink.action.cdc.kafka; | ||
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| import org.apache.paimon.flink.action.cdc.format.debezium.DebeziumSchemaUtils; | ||
| import org.apache.paimon.utils.Pair; | ||
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| import org.apache.flink.api.common.typeinfo.TypeInformation; | ||
| import org.apache.flink.connector.kafka.source.reader.deserializer.KafkaRecordDeserializationSchema; | ||
| import org.apache.flink.util.Collector; | ||
| import org.apache.flink.util.Preconditions; | ||
| import org.apache.kafka.clients.consumer.ConsumerRecord; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import java.io.IOException; | ||
| import java.nio.charset.Charset; | ||
| import java.nio.charset.StandardCharsets; | ||
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| /** Deserialization for kafka key and value. */ | ||
| public class KafkaKeyValueDeserializationSchema | ||
| implements KafkaRecordDeserializationSchema<String> { | ||
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| private static final Logger LOG = | ||
| LoggerFactory.getLogger(KafkaKeyValueDeserializationSchema.class); | ||
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| private String charset; | ||
| private String format; | ||
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| public KafkaKeyValueDeserializationSchema(String format) { | ||
| this(StandardCharsets.UTF_8.name(), format); | ||
| } | ||
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| public KafkaKeyValueDeserializationSchema(String charset, String format) { | ||
| this.charset = Preconditions.checkNotNull(charset); | ||
| this.format = format; | ||
| } | ||
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| @Override | ||
| public void deserialize(ConsumerRecord<byte[], byte[]> record, Collector<String> collector) | ||
| throws IOException { | ||
| if (record.value() != null) { | ||
| String value = new String(record.value(), Charset.forName(charset)); | ||
| String key = | ||
| record.key() != null | ||
| ? new String(record.key(), Charset.forName(charset)) | ||
| : null; | ||
| collector.collect(DebeziumSchemaUtils.rewriteValue(Pair.of(key, value), format)); | ||
| } else { | ||
| // see | ||
| // https://debezium.io/documentation/reference/2.5/connectors/mysql.html#mysql-tombstone-events | ||
| LOG.info( | ||
| "Found null message value:\n{}\nThis message will be ignored. It might be produced by tombstone-event, " | ||
| + "please check your Debezium and Kafka configuration.", | ||
| record); | ||
| } | ||
| } | ||
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| @Override | ||
| public TypeInformation<String> getProducedType() { | ||
| return TypeInformation.of(String.class); | ||
| } | ||
| } |
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