We've had a variety of problems with this stack. Here are some issues:
Redis dies on us.
Once Redis dies on us... our logstash-forwarders can't send msgs.
They seem to keep log file handles open and thus disk space isn't reclaimed when log rotation occurs.
Nice blog post of someone else's troubles:
antisp.in/2014/07/elk-stack-retrospective/
http://michael.bouvy.net/blog/en/2013/12/06/use-lumberjack-logstash-forwarder-to-forward-logs-logstash/
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