问题场景是：使用 Kafka Connect 的 Debezium MySQL Source Connector 将 MySQL 的 CDC 数据 （Avro 格式）接入到 Kafka 之后，通过 Flink 读取并解析这些 CDC 数据，然后以流式方式写入到 Hudi 表中，测试中发现，INSERT 和 UPDATE 消息都能很好的处理，但是，-D 类型的 Delete 消息被忽略了，即使已经开启了 'changelog.enabled' = 'true' ，既然无效。测试版本：Flink 1.17.1, Hudi 0.14.0, 具体测试工作和脚本在 <> 中已经完整记录，以下是问题表现：
数据库使用的是 Debezium 官方提供的 Docker 镜像，测试表为内置的 inventory 数据库中的 orders 表。操作记录：初始 4 条记录 10001 - 10004 => 添加 10005 => 更新 10001 => 删除 10004，以下是推送至 Kafka 中的全部 CDC 数据：
json
Struct{order_number=10001} | {"before":null,"after":{"osci.mysql-server-3.inventory.orders.Value":{"order_number":10001,"order_date":16816,"purchaser":1001,"quantity":1,"product_id":102}},"source":{"version":"2.2.0.Final","connector":"mysql","name":"osci.mysql-server-3","ts_ms":1706686648000,"snapshot":{"string":"first_in_data_collection"},"db":"inventory","sequence":null,"table":{"string":"orders"},"server_id":0,"gtid":null,"file":"mysql-bin.000005","pos":154,"row":0,"thread":null,"query":null},"op":"r","ts_ms":{"long":1706686648863},"transaction":null}
Struct{order_number=10002} | {"before":null,"after":{"osci.mysql-server-3.inventory.orders.Value":{"order_number":10002,"order_date":16817,"purchaser":1002,"quantity":2,"product_id":105}},"source":{"version":"2.2.0.Final","connector":"mysql","name":"osci.mysql-server-3","ts_ms":1706686648000,"snapshot":{"string":"true"},"db":"inventory","sequence":null,"table":{"string":"orders"},"server_id":0,"gtid":null,"file":"mysql-bin.000005","pos":154,"row":0,"thread":null,"query":null},"op":"r","ts_ms":{"long":1706686648864},"transaction":null}
Struct{order_number=10003} | {"before":null,"after":{"osci.mysql-server-3.inventory.orders.Value":{"order_number":10003,"order_date":16850,"purchaser":1002,"quantity":2,"product_id":106}},"source":{"version":"2.2.0.Final","connector":"mysql","name":"osci.mysql-server-3","ts_ms":1706686648000,"snapshot":{"string":"true"},"db":"inventory","sequence":null,"table":{"string":"orders"},"server_id":0,"gtid":null,"file":"mysql-bin.000005","pos":154,"row":0,"thread":null,"query":null},"op":"r","ts_ms":{"long":1706686648897},"transaction":null}
Struct{order_number=10004} | {"before":null,"after":{"osci.mysql-server-3.inventory.orders.Value":{"order_number":10004,"order_date":16852,"purchaser":1003,"quantity":1,"product_id":107}},"source":{"version":"2.2.0.Final","connector":"mysql","name":"osci.mysql-server-3","ts_ms":1706686648000,"snapshot":{"string":"last_in_data_collection"},"db":"inventory","sequence":null,"table":{"string":"orders"},"server_id":0,"gtid":null,"file":"mysql-bin.000005","pos":154,"row":0,"thread":null,"query":null},"op":"r","ts_ms":{"long":1706686648898},"transaction":null}
Struct{order_number=10005} | {"before":null,"after":{"osci.mysql-server-3.inventory.orders.Value":{"order_number":10005,"order_date":19753,"purchaser":1003,"quantity":3,"product_id":105}},"source":{"version":"2.2.0.Final","connector":"mysql","name":"osci.mysql-server-3","ts_ms":1706687538000,"snapshot":{"string":"false"},"db":"inventory","sequence":null,"table":{"string":"orders"},"server_id":223344,"gtid":null,"file":"mysql-bin.000005","pos":354,"row":0,"thread":{"long":6},"query":null},"op":"c","ts_ms":{"long":1706687539115},"transaction":null}
Struct{order_number=10001} | {"before":{"osci.mysql-server-3.inventory.orders.Value":{"order_number":10001,"order_date":16816,"purchaser":1001,"quantity":1,"product_id":102}},"after":{"osci.mysql-server-3.inventory.orders.Value":{"order_number":10001,"order_date":16816,"purchaser":1002,"quantity":5,"product_id":104}},"source":{"version":"2.2.0.Final","connector":"mysql","name":"osci.mysql-server-3","ts_ms":1706687601000,"snapshot":{"string":"false"},"db":"inventory","sequence":null,"table":{"string":"orders"},"server_id":223344,"gtid":null,"file":"mysql-bin.000005","pos":640,"row":0,"thread":{"long":6},"query":null},"op":"u","ts_ms":{"long":1706687601997},"transaction":null}
Struct{order_number=10004} | {"before":{"osci.mysql-server-3.inventory.orders.Value":{"order_number":10004,"order_date":16852,"purchaser":1003,"quantity":1,"product_id":107}},"after":null,"source":{"version":"2.2.0.Final","connector":"mysql","name":"osci.mysql-server-3","ts_ms":1706687635000,"snapshot":{"string":"false"},"db":"inventory","sequence":null,"table":{"string":"orders"},"server_id":223344,"gtid":null,"file":"mysql-bin.000005","pos":947,"row":0,"thread":{"long":6},"query":null},"op":"d","ts_ms":{"long":1706687636121},"transaction":null}
Struct{order_number=10004} | null读取 Kafka Debezium 源表结果如下：
使用 Tableau / Changelog 模式读取 Hudi Sink 表，无 -D 数据
上述行为和 《Flink Hudi 构建流式数据湖》 这篇文章对应不起来，正常是应该有 -D 记录的！ 目前尚未找到原因，欢迎了解情况的朋友留言。