We are running Kafka Connect (Confluent Platform 5.4, ie. Kafka 2.4) in a distributed mode using Debezium (MongoDB) and Confluent S3 connectors. When adding a new connector via the REST API the connector is created in RUNNING state, but no tasks are created for the connector.
Pausing and resuming the connector does not help. When we stop all workers and then start them again, the tasks are created and everything runs as it should.
The issue is not caused by the connector plugins, because we see the same behaviour for both Debezium and S3 connectors. Also in debug logs I can see that Debezium is correctly returning a task configuration from the Connector.taskConfigs() method.
Can somebody tell me what to do se we can add connectors without restarting the workers? Thanks.
Configuration details
The cluster has 3 nodes with the following connect-distributed.properties:
bootstrap.servers=kafka-broker-001:9092,kafka-broker-002:9092,kafka-broker-003:9092,kafka-broker-004:9092
group.id=tdp-QA-connect-cluster
key.converter=org.apache.kafka.connect.json.JsonConverter
key.converter.schemas.enable=false
value.converter=org.apache.kafka.connect.json.JsonConverter
value.converter.schemas.enable=false
internal.key.converter=org.apache.kafka.connect.json.JsonConverter
internal.value.converter=org.apache.kafka.connect.json.JsonConverter
internal.key.converter.schemas.enable=false
internal.value.converter.schemas.enable=false
offset.storage.topic=connect-offsets-qa
offset.storage.replication.factor=3
offset.storage.partitions=5
config.storage.topic=connect-configs-qa
config.storage.replication.factor=3
status.storage.topic=connect-status-qa
status.storage.replication.factor=3
status.storage.partitions=3
offset.flush.interval.ms=10000
rest.host.name=tdp-QA-kafka-connect-001
rest.port=10083
rest.advertised.host.name=tdp-QA-kafka-connect-001
rest.advertised.port=10083
plugin.path=/opt/kafka-connect/plugins,/usr/share/java/
security.protocol=SSL
ssl.truststore.location=/etc/kafka/ssl/kafka-connect.truststore.jks
ssl.truststore.password=<secret>
ssl.endpoint.identification.algorithm=
producer.security.protocol=SSL
producer.ssl.truststore.location=/etc/kafka/ssl/kafka-connect.truststore.jks
producer.ssl.truststore.password=<secret>
consumer.security.protocol=SSL
consumer.ssl.truststore.location=/etc/kafka/ssl/kafka-connect.truststore.jks
consumer.ssl.truststore.password=<secret>
max.request.size=20000000
max.partition.fetch.bytes=20000000
The connectors configuration
Debezium example:
{
"name": "qa-mongodb-comp-converter-task|1",
"config": {
"connector.class": "io.debezium.connector.mongodb.MongoDbConnector",
"mongodb.hosts": "mongodb-qa-001:27017,mongodb-qa-002:27017,mongodb-qa-003:27017",
"mongodb.name": "qa-debezium-comp",
"mongodb.ssl.enabled": true,
"collection.whitelist": "converter[.]task",
"tombstones.on.delete": true
}
}
S3 example:
{
"name": "qa-s3-sink-task|1",
"config": {
"connector.class": "io.confluent.connect.s3.S3SinkConnector",
"topics": "qa-debezium-comp.converter.task",
"topics.dir": "data/env/qa",
"s3.region": "eu-west-1",
"s3.bucket.name": "<bucket-name>",
"flush.size": "15000",
"rotate.interval.ms": "3600000",
"storage.class": "io.confluent.connect.s3.storage.S3Storage",
"format.class": "custom.kafka.connect.s3.format.plaintext.PlaintextFormat",
"schema.generator.class": "io.confluent.connect.storage.hive.schema.DefaultSchemaGenerator",
"partitioner.class": "io.confluent.connect.storage.partitioner.DefaultPartitioner",
"schema.compatibility": "NONE",
"key.converter": "org.apache.kafka.connect.json.JsonConverter",
"value.converter": "org.apache.kafka.connect.json.JsonConverter",
"key.converter.schemas.enable": false,
"value.converter.schemas.enable": false,
"transforms": "ExtractDocument",
"transforms.ExtractDocument.type":"custom.kafka.connect.transforms.ExtractDocument$Value"
}
}
The connectors are created using curl:
curl -X POST -H "Content-Type: application/json" --data @<json_file> http:/<connect_host>:10083/connectors
curl -X POST ...– user2732824connect.protocol. Also, make sure that Connect's internal topics are created with the right settings (config topic needs to be compacted). – Konstantine Karantasis