Apache CouchDB

Clone this repo:
  1. a327b7d Remove useless eunit include by Alexander Shorin · 2 years, 4 months ago master
  2. bbf59a2 Update to use couch_stats by Paul J. Davis · 2 years, 9 months ago windsor-merge
  3. a853c32 Return ok for pattern matching in client code by Paul J. Davis · 2 years, 9 months ago
  4. 7d64200 Replace twig with couch_log by Paul J. Davis · 2 years, 10 months ago
  5. 77dd2be The couch_log functions are all two-arity by Paul J. Davis · 2 years, 10 months ago

Rexi is a tailor-made RPC server application for sending CouchDB operations to nodes in a cluster. It is used in BigCouch as the remote procedure vehicle to get fabric functions to execute on remote cluster nodes.

Rexi better fits the needs of the BigCouch distributed data store by dropping some unneeded overhead in rex, the RPC server that ships with Erlang/OTP. Rexi is optimized for the case when you need to spawn a bunch of remote processes. Cast messages are sent from the origin to the remote rexi server, and local processes are spawned from there, which is vastly more efficient than spawning remote processes from the origin. You still get monitoring of the remote processes, but the request-handling process doesn't get stuck trying to connect to an overloaded/dead node. ‘rexi_DOWN’ messages will arrive at the client eventually. This has been an extremely advantageous mix of latency and failure detection, vastly improving the performance of BigCouch.

Rexi is used in conjunction with ‘Fabric’ which is also an application within BigCouch, but can be used on a stand-alone basis.

Getting Started

Rexi requires R13B03 or higher and can be built with rebar, which comes bundled in the repository.

License

Apache 2.0

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