The RabbitMQ broker
RabbitMQ is an Erlang implementation of an AMQP broker. Erlang has been chosen to build it because of its intrinsic support for building highly-reliable and distributed applications. Indeed, it is used to run telecommunication switches for which a proverbial total system's availability of 9 nines has been reported (that's 32 milliseconds of downtime per year). Erlang is also able to run on any operating system.
RabbitMQ implements Version 0-9-1 of AMQP with custom extensions (as allowed by the protocol) and some undeprecations (for features RabbitMQ really wants to keep). For data persistence, it relies on Mnesia, the in-memory/file-persisted embedded database of Erlang, and specific message storage and index files. For clustering, ...
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