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State of Netty
@trustin
@netty_project
16-Feb-2016
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Netty is …
Java framework
Simplifies socket client · server development
Fast yet maintainable
Asynchronous
Event-driven
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Many organic. Very forks. Wow!
180+ people in repo history
29th in most starred Java · Android project
20th in most forked Java · Android project
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What do people use it for? 1
Web services
Instant messaging
Multiplayer games
Storage · Database
High frequency trading
Media streaming
1 http://netty.io/wiki/adopters.html
http://netty.io/testimonials
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Long history short
2001.12.16. First release 1
2004.06.07. Major revision 2
2004.09.28. Moving effort to Apache MINA 3
2006.10.27. Apache MINA becomes a TLP 4
2008.06.11. Moving effort back again 5
1 http://t.motd.kr/ko/archives/1930
2 http://www.theserverside.com/news/thread.tss?thread_id=26416
3 http://t.motd.kr/ko/archives/1693
4 http://t.motd.kr/ko/archives/1560
5 http://t.motd.kr/ko/archives/1502
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Since then …
3.0.0 in October 2008
HTTP
WebSocket
SPDY 2 & 3
OpenSSL
…
3.9.2 in June 2014
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What we learned in 3
Object allocations are expensive.
Memory bandwidth
Small garbage is garbage anyway.
Some constructs are generally useful.
Byte buffers
Listenable futures
Ill-defined thread model is painful.
SSL handler
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4.0 1
Event objects → Event methods
Reference-counted buffers + pool
Modularization
Well-defined thread model
Improved API user experience
/dev/epoll · OpenSSL
1 https://blog.twitter.com/2013/netty-4-at-twitter-reduced-gc-overhead
http://netty.io/wiki/new-and-noteworthy-in-4.0.html
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4.1 1
Protocols - Memcache · DNS · MQTT · STOMP · HAProxy
Streamed XML · JSON
Asynchronous DNS lookup
SOCKS · HTTP proxy support
More flexible thread model
Android support
1 Currently at release candidate - http://netty.io/wiki/new-and-noteworthy-in-4.1.html
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Are we there yet?
“Hell no! :-)”
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Our mission … or ambition!
“Opening the future of network programming”
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Beyond 4.1
Protocols - Redis · MySQL · PostgreSQL …
kqueue · IOCP …
Metrics
Android testsuite
Java 8 lambda friendliness
Better user guide · Javadoc
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Beyond 4.1 (Cont’d)
Accurate backpressure
User-space TCP · UDP stack
Non-blocking I/O friendly parser generator
Investment in alternative system languages
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Thank you!
netty.io