Kafka Connect ignoring the Subject Strategies specified - apache-kafka

Question

I want to publish multiple table data on to same Kafka topic using the below connector config, but I am seeing below exception
Exception
Caused by: io.confluent.kafka.schemaregistry.client.rest.exceptions.RestClientException: Schema being registered is incompatible with an earlier schema; error code: 409
The connector seems to ignore the subject strategy properties set and keeps using the old ${topic}-key and ${topic}-value subjects.
[2019-04-25 22:43:45,590] INFO AvroConverterConfig values:
schema.registry.url = [http://schema-registry:8081]
basic.auth.user.info = [hidden]
auto.register.schemas = true
max.schemas.per.subject = 1000
basic.auth.credentials.source = URL
schema.registry.basic.auth.user.info = [hidden]
value.subject.name.strategy = class io.confluent.kafka.serializers.subject.TopicNameStrategy
key.subject.name.strategy = class io.confluent.kafka.serializers.subject.TopicNameStrategy
Connector configuration
curl -i -X POST -H "Accept:application/json" -H "Content-Type:application/json" localhost:8083/connectors/ -d '{
"name": "two-in-one-connector",
"config": {
"connector.class": "io.debezium.connector.mysql.MySqlConnector",
"tasks.max": "1",
"database.hostname": "xxxxxxx",
"database.port": "3306",
"database.user": "xxxxxxx",
"database.password": "xxxxxxxxx",
"database.server.id": "18405457",
"database.server.name": "xxxxxxxxxx",
"table.whitelist": "customers,phone_book",
"database.history.kafka.bootstrap.servers": "broker:9092",
"database.history.kafka.topic": "dbhistory.customer",
"transforms": "dropPrefix",
"transforms.dropPrefix.type":"org.apache.kafka.connect.transforms.RegexRouter",
"transforms.dropPrefix.regex":"(.*)",
"transforms.dropPrefix.replacement":"customer",
"key.converter.key.subject.name.strategy": "io.confluent.kafka.serializers.subject.TopicRecordNameStrategy",
"value.converter.value.subject.name.strategy": "io.confluent.kafka.serializers.subject.TopicRecordNameStrategy"
}
}'

Answer 1

Try setting strategy classes to below parameters in you connector configuration (JSON) file instead of "key.converter.key.subject.name.strategy" and "value.converter.value.subject.name.strategy"
"key.subject.name.strategy"
"value.subject.name.strategy"