interval join完成两个表关联时，没打印出来数据，出现“javax.management.InstanceAlreadyExistsException: kafka.consumer:type=app-info,id=dwd_trade_order_pay_suc_detail-0”这个问题，Flink这是什么原因？

问答 2023-01-09 来自：开发者社区

使用 interval join 合并a,b两个表，这两个表是flink cdc的表，b表的更新在a

使用 interval join 合并a,b两个表，这两个表是flink cdc的表，b表的更新在a表的上下界范围内，能够正常输出，一旦b表的更新在a表的上下界范围外，会发出一条delete消息，这个是正常的吗？我希望匹配不上不会有delete消息发出，这个可以怎么做呢？

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更新时间 2024-06-05 12:43:33

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阿里云实时计算Flink版(Alibaba Cloud Realtime Compute)，完全兼容开源的Apache Flink，比开源性能提升2～3倍，提供了完整的告警、监控、日志的解决方案、提升开发效率且无运维成本，并有社区专家提供技术支持。

立即开通

产品控制台

产品文档

实时同步

MySQL 到 Hologres

Kafka 到 Hologres

功能对比

开源Flink对比

成本优化

作业自动调优