Merb + Nanite

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Information about Merb + Nanite

Published on October 11, 2008

Author: ezmobius



This is my keynote from MerbCamp, where I talk about merb past and present as well as introduce nanite a self assembling cluster of ruby processes

Merb then and now Ezra Zygmuntowicz

Merb Then Sept 21st 2006 AKA Baby Merb

Merb Now • merb-core • merb-action-args • merb-haml • merb-assets • merb-helpers • merb-auth • merb-jquery • merb-builder • merb-mailer • merb-cache • merb-parts • merb-gen • merb-slices

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*

Most Importantly Merb should be an experimentation ground

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

Merb-1.0RC drops tomorrow! Huge thanks to the community and all contributors

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 agents consist of multiple Actors

Nanite agents advertise their services and status Feeds#crawl advertises: /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:


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