Merbthen and now

Ezra Zygmuntowiczhttp://engineyard.com

MerbThen

Sept 21st 2006http://pastie.org/14416

AKA Baby Merb

Merb Now

• merb-action-args

• merb-assets

• merb-auth

• merb-builder

• merb-cache

• merb-gen

• merb-haml

• merb-helpers

• merb-jquery

• merb-mailer

• merb-parts

• merb-slices

• merb-core

Core Tenets of Merb

Merb should be fast(no code is faster then no code)

Merb should be memory efficient

Merb code should be as simple as possible

Merb should be modular

Merb should be easy to grok and extend

(by hackers for hackers)

Merb should focus on the application server

as well as the web framework

Merb should get out of your way and be

*flexible*

Merb should be an experimentation

ground

Most Importantly

Why not just work on rails?

Monoculture is bad

Everyone wins when there is competition

Lot’s of merb’s lessons can be applied back to

rails

Huge thanks to the community and all

contributors

Merb-1.0RC drops tomorrow!

merb-stack: training wheels included

Now with that out of the way...

Introducing Nanite

Nanite is a new way of building scalable

backends for web apps

Built around RabbitMQ

• Written in erlang, clusterable, highly scalable, fast as hell.

• AMQP protocol provides many nice features

• Transient, Persistent and Transactional semantics

<3 RabbitMQ

Nanite agentsconsist of multiple Actors

Nanite agents advertisetheir services and status

Feeds#crawladvertises:/feeds/crawl

Load average is advertised as default status

Nanite Mappers

Track nanites and their advertised services and status

Can do dispatch based on a number of factors

Run inside your Merb or Rails app

State of all nanites is replicated across all mappers

Multiple Dispatch Styles

Least loaded dispatch and the fitness function

Agents ping the mapper exchange every @ping_time seconds.

Mappers track the state of all nanites and remove them from

mapping if they haven’t reported in within a timeout

Nanite gives us:

• Presence, we know when nanites are ready for requests or not.

• Self assembly, nanites can come and go and can run anywhere with zero configuration in the mappers.

• Dispatch based on load or any fitness function that suits your app

• Easily take advantage of cloud

File Streaming

Nanite makes it easy to scale web app backends

Git it on GitHub:http://github.com/ezmobius/nanite

Questions?