大佬下午好！请教个技术难点哈！Flink CDC增量抽取PostgreSQL某表数据，当表里没有增量数据写入的时候，slot的restart_lsn一直不动,这是为什么啊？正常的逻辑应该是会继续消费事务日志递增restart_lsn，只是没有数据需要应用了，不然事务日志文件岂不是都不能删除，最终打爆源库的空间，如果生产上某表没增量写入，这样的结果岂不是很危险嘛，re都推不了，con还能推到哪里去....

问答 2023-05-01 来自：开发者社区

我在用flink cdc的从oracle同步历史数据到doris，请教一下存量数据是先全部拉到内存，

我在用flink cdc的从oracle同步历史数据到doris，请教一下存量数据是先全部拉到内存，拉完后再从内存存入doris吗？小数据量的时候没有问题，当我拉一个大表（2千万数据量，2个G大小）历史数据的时候，跑3-5分钟就报错了，怀疑是不是资源问题。有大佬指点一下吗。

问答 2023-05-01 来自：开发者社区

大佬能看下Flink CDC这个源表更新或者插入数据sink表为啥没有更新啊

大佬能看下Flink CDC这个源表更新或者插入数据sink表为啥没有更新啊本地测试需要开checkpoint吗，是row格式的，不需要设置checkpoint，我百度设置'debezium.snapshot.mode' = 'initial' 就行了，这个参数好像需要设置，为啥这个参数影响这么大呢，怎么设置先全量，然后再增量呢，我现在有个场景，有100张表，我想先用spark或者presto....

问答 2023-05-01 来自：开发者社区

请教各位大佬，flink cdc同步mysql数据到iceberg，iceberg有50个表，然后要

请教各位大佬，flink cdc同步mysql数据到iceberg，iceberg有50个表，然后要对这50个表的小文件进行重写，怎么操作啊？我看官网有一段代码，我照搬过来后发现有问题

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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。

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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