尝试在Flink的自定义聚合函数中使用State，发现open函数中通过FunctionContext无法获取到RuntimeContext 如何在聚合函数中使用State? import org.apache.flink.api.common.typeinfo.{BasicTypeInfo, TypeInformation} import org.apache.flink.api.jav...

问答 2022-02-15 来自：开发者社区

FLINK TABLE API 自定义聚合函数UDAF从check point恢复任务报状态序列

大家好：我在使用flink table api 实现group by 聚合操作的时候，自定义了一个UDAF函数，首次在集群上运行的时候是正确的，但是从check point恢复任务的时候报下面错误，但是使用内置的函数就没问题，不知道我该怎么解决呢？ java.lang.RuntimeException: Error while getting state at org.apache.flink.....

问答 2022-02-15 来自：开发者社区

Flink 自定义聚合函数 AggregateFunction 不触发

本地sock测试AggregateFunction 生效但是上了flink集群后（连接的kafka源，数据能正常收到）发现AggregateFunction 的getresult方法不触发，而createAccumulator和add均能触发，

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更新时间 2024-06-15 12:39:49

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实时计算Flink版

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