Kafka, Redis and Logstash+ElasticSearch have really nothing to do with each other.<p>Kafka is a distributed, fault-tolerant and highly scalable message broker.<p>Redis is a very fast key&#x2F;value (another other data types) store.<p>I suppose that at a high level Logstash can be compared to Kafka but IME Logstash can&#x27;t handle scale.  It&#x27;s trivially easy to bring Logstash to its knees.<p>Elasticsearch is, well, a search engine.