Filebeat - Redis - Logstash: What Redis brings more?

Elastic Stack Logstash
1

Hi,

What do I earn if I add Redis between Filebeat and Logstash? In this article (https://www.elastic.co/guide/en/logstash/current/deploying-and-scaling.html) it does not provide a clear statement why Redis or Kafka is really required, but the talk about using persistent Queues in Logstash instead.

What architectural aspects do I cover with Redis between Filebeat and Logstash?

Thanks,
Kurt

2

With persistent queues available I guess the main point of a broker would be load balancing if you run more than one Logstash instance. All instances would then be pulling queued-up events at the maximum rate.

3

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