About the ksqldb print show "Value format: does not match any supported format"

dear all,

I just started using the confluent platform, I am using the community version, I want to use jdbc connect to synchronize a mysql table, after creating a topic, check the details of the topic, the following information appears, and the table data shows garbled characters。

ksql> list topics;

 Kafka Topic                 | Partitions | Partition Replicas 
---------------------------------------------------------------
 console-consumer-51507      | 1          | 1                  
 default_ksql_processing_log | 1          | 1                  
 mysql-01-t1                 | 1          | 1                  
 mysql-0t1                   | 1          | 1                  
 yyt_test                    | 1          | 1                  
---------------------------------------------------------------
ksql> print 'mysql-0t1' from beginning;
*Key format: ¯\_(ツ)_/¯ - no data processed*
*Value format:  does not match any supported format. It may be a STRING with encoding other than UTF8, or some other format.*
rowtime: 2021/09/10 04:06:20.750 Z, key: <null>, value: \x00\x00\x00\x00\x02\x02\x02\x14, partition: 0
rowtime: 2021/09/10 04:06:20.752 Z, key: <null>, value: \x00\x00\x00\x00\x02\x04\x02\x14, partition: 0
rowtime: 2021/09/10 04:06:20.752 Z, key: <null>, value: \x00\x00\x00\x00\x02\x06\x02\x14, partition: 0
rowtime: 2021/09/10 04:06:20.752 Z, key: <null>, value: \x00\x00\x00\x00\x02\x08\x02\x14, partition: 0
rowtime: 2021/09/10 04:06:20.752 Z, key: <null>, value: \x00\x00\x00\x00\x02\x0A\x02\x14, partition: 0
rowtime: 2021/09/10 04:06:20.752 Z, key: <null>, value: \x00\x00\x00\x00\x02\x0C\x02\x14, partition: 0
rowtime: 2021/09/10 04:06:20.752 Z, key: <null>, value: \x00\x00\x00\x00\x02\x0E\x02\x14, partition: 0
rowtime: 2021/09/10 04:06:20.752 Z, key: <null>, value: \x00\x00\x00\x00\x02\x10\x02\x14, partition: 0
rowtime: 2021/09/10 04:06:20.752 Z, key: <null>, value: \x00\x00\x00\x00\x02\x12\x02\x14, partition: 0
rowtime: 2021/09/10 04:06:20.752 Z, key: <null>, value: \x00\x00\x00\x00\x02\x14\x02\x14, partition: 0
rowtime: 2021/09/10 04:06:20.752 Z, key: <null>, value: \x00\x00\x00\x00\x02\x16\x02\x14, partition: 0
rowtime: 2021/09/10 04:06:20.752 Z, key: <null>, value: \x00\x00\x00\x00\x02\x18\x02\x14, partition: 0
rowtime: 2021/09/10 04:06:20.752 Z, key: <null>, value: \x00\x00\x00\x00\x02\x1A\x02\x14, partition: 0
rowtime: 2021/09/10 04:06:20.752 Z, key: <null>, value: \x00\x00\x00\x00\x02\x1C\x02\x14, partition: 0
rowtime: 2021/09/10 04:06:20.752 Z, key: <null>, value: \x00\x00\x00\x00\x02\x1E\x02\x14, partition: 0

jdbc source:

 curl -X POST http://10.192.11.71:8083/connectors -H "Content-Type: application/json" -d '{
        "name": "jdbc_source_yyt_02",
        "config": {
                "connector.class": "io.confluent.connect.jdbc.JdbcSourceConnector",
                "connection.url": "jdbc:mysql://10.192.123.169:3306/test",
                "connection.user": "root",
                "connection.password": "Mysql@123$",
                "topic.prefix": "mysql-0",
                "mode":"bulk",
                "poll.interval.ms" : 100000,
                "catalog.pattern" : "test",
                "table.whitelist" : "t1"
                }
        }'

mysql table define:

mysql> show create table t1;
+-------+---------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                          |
+-------+---------------------------------------------------------------------------------------------------------------------------------------+
| t1    | CREATE TABLE `t1` (
  `c1` int(11) NOT NULL,
  `c2` int(11) DEFAULT NULL,
  PRIMARY KEY (`c1`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+-------+---------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql> 

Configuration file:

# pwd

/home/Confluent/confluent-6.2.0/etc/schema-registry
# cat connect-avro-distributed.properties

bootstrap.servers=10.192.11.71:9092,10.192.11.72:9092,10.192.11.74:9092

group.id=connect-cluster

key.converter=io.confluent.connect.avro.AvroConverter

key.converter.schema.registry.url=http://10.192.11.72:8081

value.converter=io.confluent.connect.avro.AvroConverter

value.converter.schema.registry.url=http://10.192.11.72:8081

config.storage.topic=connect-configs

offset.storage.topic=connect-offsets

status.storage.topic=connect-statuses

config.storage.replication.factor=3

offset.storage.replication.factor=3

status.storage.replication.factor=3

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

plugin.path=/usr/share/java,/home/Confluent/confluent-6.2.0/share/java/kafka,

How can I solve this problem? thank you very much!

Can someone please help?

Welcome to the forum!

I edited your post to add code formatting to make it readable :slight_smile:

What version of ksqlDB are you using? Is it set up to use the same Schema Registry that Kafka Connect is using? What happens if you run the following in ksqlDB?

CREATE STREAM TEST WITH (KAFKA_TOPIC='mysql-0t1', VALUE_FORMAT='AVRO');
SET 'auto.offset.reset' = 'earliest';
SELECT * FROM TEST EMIT CHANGES

Thank you Robin Moffatt , this problem has been resolved。

Can you share what the solution was here, to help others who encounter the same problem? thanks!