title: What's the good architecture for ELK?
body: <p>I am trying to use ELK to build a log analysis system. I see a lot of architecture which use ELK in different way. one of them is </p>
  
  <p>Logstash->Redis->Logstash->Elasticseach->Kibana</p>
  
  <p>The first Logstash is used for collecting logs, the second Logstash is used for filter logs. </p>
  
  <p>I am not very clear about the Redis, Do we have to use it? Why not using Kafka?</p>