使用datastax收听Cassandra数据库 [英] Listen to a cassandra database with datastax

问题描述

每次使用datastax为Java添加cassandra数据库时，如何从cassandra数据库中获取记录?也就是说，如何监听" cassandra数据库?谢谢

How can I get a record from cassandra database every time that it is add using datastax for java? That is, how can I "listen" cassandra database? Thanks

推荐答案

没有简单的方法可以做到这一点. Cassandra具有更改数据捕获功能，但功能水平很低(并且可能取决于Cassandra的版本)，而且使用起来并不容易.您可以编写自己的实现(上面链接中的指针)，或使用类似此的方法，但它已经很旧了.而且您需要自己处理重复数据删除，因为当RF> 1时，每个节点都会收到&写入数据.

There is no easy way to do it. Cassandra has Change Data Capture functionality, but it's quite low level (and could depend on version of Cassandra), and it's not easy to use it. You can write your own implementation (pointers in link above), or use something like this, but it's very old. And you'll need to handle deduplication yourself, as when you have RF > 1, every node will receive & write the data.

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