I want to send the data sent to the topic to a postgresql-database. So I follow this guide and have configured the properties-file like this:
name=transaction-sink
connector.class=io.confluent.connect.jdbc.JdbcSinkConnector
tasks.max=1
topics=transactions
connection.url=jdbc:postgresql://localhost:5432/db
connection.user=db-user
connection.password=
auto.create=true
insert.mode=insert
table.name.format=transaction
pk.mode=none
I start the connector with
./bin/connect-standalone etc/schema-registry/connect-avro-standalone.properties etc/kafka-connect-jdbc/sink-quickstart-postgresql.properties
The sink-connector is created but does not start due to this error:
Caused by: org.apache.kafka.common.errors.SerializationException: Error deserializing Avro message for id -1
Caused by: org.apache.kafka.common.errors.SerializationException: Unknown magic byte!
The schema is in avro-format and registered and I can send (produce) messages to the topic and read (consume) from it. But I can't seem to sent it to the database.
This is my ./etc/schema-registry/connect-avro-standalone.properties
key.converter=io.confluent.connect.avro.AvroConverter
key.converter.schema.registry.url=http://localhost:8081
value.converter=io.confluent.connect.avro.AvroConverter
value.converter.schema.registry.url=http://localhost:8081
This is a producer feeding the topic using the java-api:
properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, KafkaAvroSerializer.class);
properties.put(AbstractKafkaAvroSerDeConfig.SCHEMA_REGISTRY_URL_CONFIG, "http://localhost:8081");
try (KafkaProducer<String, Transaction> producer = new KafkaProducer<>(properties)) {
Transaction transaction = new Transaction();
transaction.setFoo("foo");
transaction.setBar("bar");
UUID uuid = UUID.randomUUID();
final ProducerRecord<String, Transaction> record = new ProducerRecord<>(TOPIC, uuid.toString(), transaction);
producer.send(record);
}
I'm verifying data is properly serialized and deserialized using
./bin/kafka-avro-console-consumer --bootstrap-server localhost:9092 \
--property schema.registry.url=http://localhost:8081 \
--topic transactions \
--from-beginning --max-messages 1
The database is up and running.
KEY_SERIALIZER_CLASS_CONFIG
set to for the Producer? – Robin Moffatt