ELK - why a msg queue is important

People often wonder why the heck there is a broker. Sometimes its Redis, sometimes AMQ or RabbitMQ.

A good answer is below:
http://stackoverflow.com/questions/26930047/why-redis-amqp-or-0mq-is-needed-along-with-elastic-search-and-logstash

Some good reads about setting up AMQ or Redis:
http://blog.lusis.org/blog/2012/01/31/load-balancing-logstash-with-amqp/
http://blog.lusis.org/blog/2012/01/31/load-balancing-logstash-with-redis/