flink-python/pyflink/examples/datastream/connectors/kafka_avro_format.py

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import logging
import sys

from pyflink.common import Types
from pyflink.datastream import StreamExecutionEnvironment
from pyflink.datastream.connectors.kafka import FlinkKafkaProducer, FlinkKafkaConsumer
from pyflink.datastream.formats.avro import AvroRowSerializationSchema, AvroRowDeserializationSchema


# Make sure that the Kafka cluster is started and the topic 'test_avro_topic' is
# created before executing this job.
def write_to_kafka(env):
    ds = env.from_collection([
        (1, 'hi'), (2, 'hello'), (3, 'hi'), (4, 'hello'), (5, 'hi'), (6, 'hello'), (6, 'hello')],
        type_info=Types.ROW([Types.INT(), Types.STRING()]))

    serialization_schema = AvroRowSerializationSchema(
        avro_schema_string="""
            {
                "type": "record",
                "name": "TestRecord",
                "fields": [
                    {"name": "id", "type": "int"},
                    {"name": "name", "type": "string"}
                ]
            }"""
    )

    kafka_producer = FlinkKafkaProducer(
        topic='test_avro_topic',
        serialization_schema=serialization_schema,
        producer_config={'bootstrap.servers': 'localhost:9092', 'group.id': 'test_group'}
    )

    # note that the output type of ds must be RowTypeInfo
    ds.add_sink(kafka_producer)
    env.execute()


def read_from_kafka(env):
    deserialization_schema = AvroRowDeserializationSchema(
        avro_schema_string="""
            {
                "type": "record",
                "name": "TestRecord",
                "fields": [
                    {"name": "id", "type": "int"},
                    {"name": "name", "type": "string"}
                ]
            }"""
    )

    kafka_consumer = FlinkKafkaConsumer(
        topics='test_avro_topic',
        deserialization_schema=deserialization_schema,
        properties={'bootstrap.servers': 'localhost:9092', 'group.id': 'test_group_1'}
    )
    kafka_consumer.set_start_from_earliest()

    env.add_source(kafka_consumer).print()
    env.execute()


if __name__ == '__main__':
    logging.basicConfig(stream=sys.stdout, level=logging.INFO, format="%(message)s")

    env = StreamExecutionEnvironment.get_execution_environment()
    env.add_jars("file:///path/to/flink-sql-avro-1.15.0.jar",
                 "file:///path/to/flink-sql-connector-kafka-1.15.0.jar")

    print("start writing data to kafka")
    write_to_kafka(env)

    print("start reading data from kafka")
    read_from_kafka(env)