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?
