Apache Kafka is a popular choice for powering data pipelines. Apache kafka added kafka stream to support popular etl use cases. KSQL makes it simple to transform data within the pipeline, readying messages to cleanly land in another system. KSQL is the streaming SQL engine for Apache Kafka. It provides an easy-to-use yet powerful interactive SQL interface for stream processing on Kafka, without the need to write code in a programming language such as Java or Python. KSQL is scalable, elastic, fault-tolerant, and real-time. It supports a wide range of streaming operations, including data filtering, transformations, aggregations, joins, windowing, and sessionization.

https://docs.confluent.io/current/ksql/docs/index.html

对于etl系统来说，Rabbitmq并不是一个受欢迎的选择，它更适合那些需要简单的消息传递系统和更低吞吐量的系统。

Scaling both is hard in a distributed fault tolerant way but I'd make a case that it's much harder at massive scale with RabbitMQ. It's not trivial to understand Shovel, Federation, Mirrored Msg Queues, ACK, Mem issues, Fault tollerance etc. Not to say you won't also have specific issues with Zookeeper etc on Kafka but there are less moving parts to manage. That said, you get a Polyglot exchange with RMQ which you don't with Kafka. If you want streaming, use Kafka. If you want simple IoT or similar high volume packet delivery, use Kafka. It's about smart consumers. If you want msg flexibility and higher reliability with higher costs and possibly some complexity, use RMQ.

我能想到的唯一好处是事务性功能，其余的都可以用Kafka来完成

我知道这是一个老问题了，但是在处理数据编校时RabbitMQ可能是一个更好的选择。

在RabbitMQ中，默认情况下，一旦消息被消费，它就会被删除。在Kafka中，默认情况下，消息保存一周。通常将这个时间设置为更长的时间，甚至永远不删除它们。

虽然这两个产品都可以配置为保留(或不保留)消息，但如果CCPA或GDPR合规性是一个问题，我会选择RabbitMQ。

Kafka和RabbitMQ的5个主要区别:

应该选择哪个消息传递系统，还是应该更改现有的消息传递系统?​

以上问题没有唯一的答案。当您必须决定使用哪个消息传递系统或是否应该更改现有系统时，一种可能的检查方法是“评估范围和成本”

我知道有点晚了，也许你已经间接地说过了，但是，Kafka根本不是一个队列，它是一个日志(就像上面有人说的，基于民意调查)。

简单来说，当你更喜欢RabbitMQ(或任何队列技术)而不是Kafka时，最明显的用例是:

You have multiple consumers consuming from a queue and whenever there is a new message in the queue and an available consumer, you want this message to be processed. If you look closely at how Kafka works, you'll notice it does not know how to do that, because of partition scaling, you'll have a consumer dedicated to a partition and you'll get into starvation issue. Issue that is easily avoided by using simple queue techno. You can think of using a thread that will dispatch the different messages from same partition, but again, Kafka does not have any selective acknowledgment mechanisms.

你能做的最多的就是像那些家伙一样，试着把Kafka转换成一个队列: https://github.com/softwaremill/kmq

雅尼克