Erlangfor video delivery platforms

Friday, October 19, 12

About me

Worked for Delta, Bellsouth, Sun Microsystems, Weather Channel

Love realtime, high volume systems

Sr. Director Engineering EricssonN2 Broadband -> Tandberg TV -> Ericsson

hwatkins @ github

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Media Delivery Management SystemErlang (of course!)

Realtime processing

Protocol specific pieces

Ruby on Rails

Front end and some API’s

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Media Delivery Management SystemMongoDB

Persistence layer

Geo redundant

RabbitMQ (AMQP)

Messaging Bus

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VOD ecosystem

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Async processing

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Sync to Async

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Dynamic RoutingAbility to add components on the fly

Apply components to different profiles

In harmony with multiple VM’s

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Competing Consumer

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Clients

HTTP DSM-CCISO/IEC 13818-6

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Java binary protocol

Class per section

Lots of code

Lots of objects

Lots of GC

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Binary Data

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Pattern Matching

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Memory Management

Java

Shared memory with reference count

Erlang

per thread heap

single assignment

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Memory Footprint

Identical functionality developed in Java and Erlang

AMQP workers and connected to MongoDB

Java averaged 1 GB memory

Erlang averaged 200 MB memory

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Threading ModelThreading is ideal for things like http requests

Java

Threads heavyweight - thread pools

Erlang

Lightweight - spawn on demand

Think linear

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Clustering

Java

Memory - Terracotta

Erlang

Built in netadm:ping

Mnesia - disk or memory

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Runtime Debugging

REPL (Read-Eval-Print-Loop)

Cookie

Remote Shell

Issue commands

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OTP

Built for the real world - Use it!

application, gen_server and supervisor

Use alot!

gen_fsm and gen_event

Not as much but still useful

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OTP Custom Behavior

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Packagingreltool

rebar generate

start, stop, console, attach

runtime vm and libraries

small ~29M release

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Useful Libraries

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Rebar

De facto build system

Wrap in simple makefile for ease

Make dependancies easy to manage

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folsom

Github boundary/folsom

Metrics and counters during runtime

Expose through mochiweb

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Others

Mochiweb - Web Server

Webmachine - Rest

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