Elasticsearch.  Restful, JSON, uses Lucern.  Java.
    Shards and replicas.  JSON and Java APIs.
    Lucene search language.
Logstash.  Broker uses Redis message queues (looks more like SHM).  JRuby
Kibana
    For Elasicsearch.  Strictly HTML+Javascript.  Requires only plain webserver.


grokdebug.herokuapp.com
cookbook.logstash.net
logstashbook.com