无法使用Apache Kafka和Debezium从联合的MySQL表中读取数据

Question

我正在使用Apache Kafka和Debezium的连接器服务来查看表中的数据更改。另外，我使用的是AWS EC2，其中有一个具有联合表的数据库。如果我创建了一个无联合表，并使用Zookeeper，Kafka和Kafka Connect运行我的docker watcher，则可以从该表读取数据，但是当我看到一个联合表时，则无法读取数据。

我尝试在连接器的配置中添加查询，但这没用。

我的命令是：

启动Zookeeper

$ docker run -it --rm --name zookeeper -p 2181:2181 -p 2888:2888 -p 3888:3888 debezium/zookeeper:0.9

启动Kafka

$ docker run -it --rm --name kafka -p 9092:9092 --link zookeeper:zookeeper debezium/kafka:0.9

启动Kafka Connect

$ docker run -it --rm --name connect -p 8083:8083 -e GROUP_ID=1 -e CONFIG_STORAGE_TOPIC=my_connect_configs -e OFFSET_STORAGE_TOPIC=my_connect_offsets -e STATUS_STORAGE_TOPIC=my_connect_statuses --link zookeeper:zookeeper --link kafka:kafka debezium/connect:0.9

注册连接器

$ curl -i -X POST -H "Accept:application/json" -H "Content-Type:application/json" localhost:8083/connectors/ -d '{ "name": "inventory-connector", "config": { "connector.class": "io.debezium.connector.mysql.MySqlConnector", "tasks.max": "1", "database.hostname": "mysql", "database.port": "3306", "database.user": "debezium", "database.password": "dbz", "database.server.id": "184054", "database.server.name": "dbserver1", "database.whitelist": "inventory", "database.history.kafka.bootstrap.servers": "kafka:9092", "database.history.kafka.topic": "dbhistory.inventory" } }'

显示数据更改

$ docker run -it --name watcher --rm --link zookeeper:zookeeper --link kafka:kafka debezium/kafka:0.9 watch-topic -a -k dbserver1.inventory.customers

我希望看到这样的东西：

null    {"schema":{"type":"struct","fields":[{"type":"struct","fields":[{"type":"int32","optional":true,"field":"a1"},{"type":"string","optional":true,"field":"a2"}],"optional":true,"name":"dbserver1.cobranza.foobar_1.Value","field":"before"},{"type":"struct","fields":[{"type":"int32","optional":true,"field":"a1"},{"type":"string","optional":true,"field":"a2"}],"optional":true,"name":"dbserver1.cobranza.foobar_1.Value","field":"after"},{"type":"struct","fields":[{"type":"string","optional":true,"field":"version"},{"type":"string","optional":true,"field":"connector"},{"type":"string","optional":false,"field":"name"},{"type":"int64","optional":false,"field":"server_id"},{"type":"int64","optional":false,"field":"ts_sec"},
...

Answer 1

看着FEDERATED引擎描述https://dev.mysql.com/doc/refman/8.0/en/federated-storage-engine.html，在我看来，对联合表所做的更改未记录在服务器binlog文件中。如果是这种情况，那么Debezium无法流式传输更改，因为它看不到它们。

它应该能够从源表中流式传输更改。