State of Netty (2016)

The slides for my talk at LINE Developer Meetup in Fukuoka on February 16, 2016

An older version with a video: https://speakerdeck.com/trustin/state-of-netty-2014

Transcript

1. State of Netty
   @trustin
   @netty_project
   16-Feb-2016
   

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2. Netty is …
   Java framework
   Simplifies socket client · server development
   Fast yet maintainable
   Asynchronous
   Event-driven
   

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3. 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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4. 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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5. 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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6. Since then …
   3.0.0 in October 2008
   HTTP
   WebSocket
   SPDY 2 & 3
   OpenSSL
   …
   3.9.2 in June 2014
   

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7. 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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8. 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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9. 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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10. Are we there yet?
    “Hell no! :-)”
    

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11. Our mission … or ambition!
    “Opening the future of network programming”
    

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12. Beyond 4.1
    Protocols - Redis · MySQL · PostgreSQL …
    kqueue · IOCP …
    Metrics
    Android testsuite
    Java 8 lambda friendliness
    Better user guide · Javadoc
    

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13. 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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14. Thank you!
    netty.io
    

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