通过Apache-kafka将删除事件从MySQL流式传输到PostgreSQL [英] Stream delete events from MySQL to PostgreSQL via Apache-kafka
问题描述
我正在尝试使用Apache Kafka.将事件从MySQL传输到PostgreSQL尽管插入和更新工作正常，但我不知道如何从MySQL删除记录并将该事件传输到
I am trying to stream events from MySQL to PostgreSQL using Apache Kafka. Although insertions and updates work fine, I can't figure out how to delete a record from MySQL and stream this event to PostgreSQL.
假定以下拓扑:
+-------------+
| |
| MySQL |
| |
+------+------+
|
|
|
+---------------v------------------+
| |
| Kafka Connect |
| (Debezium, JDBC connectors) |
| |
+---------------+------------------+
|
|
|
|
+-------v--------+
| |
| PostgreSQL |
| |
+----------------+
我正在使用以下docker镜像;
I am using the following docker images;
- Apache-Zookeper
- Apache-Kafka
- Debezium/JDBC connectors
然后
# Start the application
export DEBEZIUM_VERSION=0.6
docker-compose up
# Start PostgreSQL connector
curl -i -X POST -H "Accept:application/json" -H "Content-Type:application/json" http://localhost:8083/connectors/ -d @jdbc-sink.json
# Start MySQL connector
curl -i -X POST -H "Accept:application/json" -H "Content-Type:application/json" http://localhost:8083/connectors/ -d @source.json
这是MySQL数据库的内容；
Here is the content of MySQL database;
docker-compose -f docker-compose-jdbc.yaml exec mysql bash -c 'mysql -u $MYSQL_USER -p$MYSQL_PASSWORD inventory -e "select * from customers"'
+------+------------+-----------+-----------------------+
| id | first_name | last_name | email |
+------+------------+-----------+-----------------------+
| 1001 | Sally | Thomas | sally.thomas@acme.com |
| 1002 | George | Bailey | gbailey@foobar.com |
| 1003 | Edward | Walker | ed@walker.com |
| 1004 | Anne | Kretchmar | annek@noanswer.org |
+------+------------+-----------+-----------------------+
我们可以验证PostgresSQL的内容是否相同；
And we can verify that the content of PostgresSQL is identical;
docker-compose -f docker-compose-jdbc.yaml exec postgres bash -c 'psql -U $POSTGRES_USER $POSTGRES_DB -c "select * from customers"'
last_name | id | first_name | email
-----------+------+------------+-----------------------
Thomas | 1001 | Sally | sally.thomas@acme.com
Bailey | 1002 | George | gbailey@foobar.com
Walker | 1003 | Edward | ed@walker.com
Kretchmar | 1004 | Anne | annek@noanswer.org
(4 rows)
假设我要使用id=1004从MySQL数据库中删除记录；
Assume that I want to delete the record with id=1004 from MySQL database;
docker-compose -f docker-compose-jdbc.yaml exec mysql bash -c 'mysql -u $MYSQL_USER -p$MYSQL_PASSWORD inventory'
mysql> delete from customers where id = 1004;
docker-compose -f docker-compose-jdbc.yaml exec mysql bash -c 'mysql -u $MYSQL_USER -p$MYSQL_PASSWORD inventory -e "select * from customers"'
+------+------------+-----------+-----------------------+
| id | first_name | last_name | email |
+------+------------+-----------+-----------------------+
| 1001 | Sally | Thomas | sally.thomas@acme.com |
| 1002 | George | Bailey | gbailey@foobar.com |
| 1003 | Edward | Walker | ed@walker.com |
+------+------------+-----------+-----------------------+
尽管记录已从MySQL中删除，但该条目仍显示在PostgresSQL中
Although the record is deleted from MySQL, the entry still appears in PostgresSQL
docker-compose -f docker-compose-jdbc.yaml exec postgres bash -c 'psql -U $POSTGRES_USER $POSTGRES_DB -c "select * from customers"'
last_name | id | first_name | email
-----------+------+------------+-----------------------
Thomas | 1001 | Sally | sally.thomas@acme.com
Bailey | 1002 | George | gbailey@foobar.com
Walker | 1003 | Edward | ed@walker.com
Kretchmar | 1004 | Anne | annek@noanswer.org
(4 rows)
我知道支持软删除，但是是否也可以从PostgresSQL中完全删除该特定条目(通过通过Apache-Kafka从MySQL发送del事件)?
I understand that soft deletes are supported however, is it possible to completely delete that particular entry from PostgresSQL as well (by streaming the del event from MySQL via Apache-Kafka)?
这是source.json文件的内容
{
"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": "schema-changes.inventory",
"transforms": "route",
"transforms.route.type": "org.apache.kafka.connect.transforms.RegexRouter",
"transforms.route.regex": "([^.]+)\\.([^.]+)\\.([^.]+)",
"transforms.route.replacement": "$3"
}
}
这是jdbc-sink.json文件的内容
{
"name": "jdbc-sink",
"config": {
"connector.class": "io.confluent.connect.jdbc.JdbcSinkConnector",
"tasks.max": "1",
"topics": "customers",
"connection.url": "jdbc:postgresql://postgres:5432/inventory?user=postgresuser&password=postgrespw",
"transforms": "unwrap",
"transforms.unwrap.type": "io.debezium.transforms.UnwrapFromEnvelope",
"auto.create": "true",
"insert.mode": "upsert",
"pk.fields": "id",
"pk.mode": "record_value"
}
}
我还尝试设置"pk.mode": "record_key"和"delete.enabled": "true"(错误修复建议)，但此修改似乎无效.
I have also tried to set "pk.mode": "record_key" and "delete.enabled": "true" (bug fix suggestion) but this modification doesn't seem to work.
推荐答案
Confluent JDBC接收器连接器当前不支持删除.有一个待处理的拉取请求(您已链接到它)，但是尚未合并.
Deletes are currently not supported by the Confluent JDBC sink connector. There's a pending pull request (you already linked to it), but this hasn't been merged yet.
目前，您可以自己基于该分支构建JDBC接收器连接器，也可以创建一个简单的自定义接收器连接器，该连接器通过在目标数据库上执行相应的DELETE语句来处理逻辑删除事件.
For the time being, you could either build the JDBC sink connector based on that branch yourself, or you create a simple custom sink connector which just handles tombstone events by executing a corresponding DELETE statement on the target database.
这篇关于通过Apache-kafka将删除事件从MySQL流式传输到PostgreSQL的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
