ABOUT CHATLET’S CHAT

Michal Ptaszek, @michalptaszekRiot Games

WHAT’S PLANNED

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GAME CHAT RIAK LESSONSLEARNED

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Q&A

WHAT IS LEAGUE OF LEGENDS?

2009LAUNCH

TEAMORIENTED

100+CHAMPS

MODERNFANTASY

MESSAGING SERVICE

PRESENCE SERVICE

SOCIAL GRAPH SERVICE

WHAT IS IT?CHAT

WHAT IS IT?CHAT

CHAT BY THE NUMBERS

67 million monthly players

27 million daily

players

7.5 million concurrent

players

1 billion events

routed per server, per

day

CHAT AT 10K FEETSTABLE, SCALABLE CHAT SERVICE

PROTOCOL DATA STORESERVER

STABLE, SCALABLE CHAT SERVICE

DATA STORESERVERPROTOCOL

CHAT AT 10K FEET

PROTOCOL: XMPP

Decentralized Architecture

Openness

Extensibility

Availability of Client

Libraries

Security Wide Adoption

STABLE, SCALABLE CHAT SERVICE

CHAT AT 10K FEET

DATA STOREPROTOCOL SERVER

SERVER: EJABBERD

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Which gives us...

TECHNOLOGY: ERLANG/OTPErlang is...

A functional language

Built with concurrency and distribution in mind

Able to scale extremely well

Capable of reloading code on the fly

A declarative style of programming

An easier way to build our distributed applications

More time to focus on coding

Less downtime

SERVER: EJABBERD - PHILOSOPHY

ARCHITECTURE

LET ITCRASH

FAULTTOLERANCE

SERVER: EJABBERD - ARCHITECTURE

SecondaryRiak Cluster

Ejabberd Ejabberd LB

Riak Riak

STABLE, SCALABLE CHAT SERVICE

CHAT AT 10K FEET

SERVERPROTOCOL DATA STORE

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RIAK

RIAK: ARCHITECTURE

SCALE Linearly scalable

No growth headaches

FAULTTOLERANCE No SPoF Higher

uptime

SCHEMA-LESSFaster feature

iterations

More shipped features

ARCHITECTURE

DATA STORE: RIAK

Ejabberd Ejabberd

Riak Riak

Ejabberd

Riak‣

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CRDT

RIAK: CONFLICT RESOLUTION

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CRDT

RIAK: CONFLICT RESOLUTION

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FRIENDS LISTS

RIAK: DATA TYPES

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IGNORE LISTS

RIAK: DATA TYPES

OFFLINE MESSAGES

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RIAK: DATA TYPES

LAST ONLINE TS

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RIAK: DATA TYPES

Source cluster #1

MDC REPLICATION

DATA STORE: RIAK

Sinkcluster

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Source cluster #2

Source cluster #3

RIAK STATS

RIAK: MONITORING

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RIAK CLUSTER

RIAK: MONITORING

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KEEP YOUR OBJECTS SMALL

LESSONS LEARNED

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AVOID SIBLINGS CREATION

LESSONS LEARNED

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ALWAYS LOAD TEST YOUR CODE

LESSONS LEARNED

THINGS WILL FAIL

LESSONS LEARNED

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CHAT IS DOING GREAT!

SCALE AND PERFORMANCE

CHAT IS EVOLVING

SITUATIONCURRENT

THANK YOU!ANY QUESTIONS?