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Finagle By Twitter Engineer @ Knoldus

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Knoldus Inc.
Knoldus Inc.

This document introduces Finagle, an open source library developed by Twitter for building reliable services. It discusses how Finagle uses futures and promises to handle asynchronous operations. It also describes how Finagle provides networking capabilities like address resolution and load balancing. Finagle allows defining services as functions that return futures, and combines multiple services through composition of futures. This provides benefits like reliability, performance and flexibility in service definition.

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@ Introduction to Finagle
puneet@twitter.com Core Services - Platform Engineering
In the beginning ...
Finagle By Twitter Engineer @ Knoldus
Finagle By Twitter Engineer @ Knoldus
Finagle By Twitter Engineer @ Knoldus
A brave new world ... Typesafe Expressive Performant (thank you JVM) ...
Futures
Synchronous Futures def piDigit ( n : Int ) : Int def piDigit ( n : Int ) : Future[Int] println ( piDigit ( 100 ) ) piDigit ( 100 ) onSuccess println
Synchronous Futures
Synchronous Futures def piDigit ( n : Int ) : Int def piDigit ( n : Int ) : Future[Int] println ( piDigit ( 100 ) ) piDigit ( 100 ) onSuccess println println ( piDigit ( 100 ) * 10 ) ) piDigit ( 100 ) map { _ * 10 } onSuccess println println ( piDigit ( piDigit ( 100 ) ) ) piDigit ( 100 ) flatMap piDigit onSuccess println println ( ( 0 to 100 ) map piDigit ) Future.collect { ( 0 to 100 ) map piDigit } onSuccess println
Finagle By Twitter Engineer @ Knoldus
the networking glue ... Address resolution TCP handshake Serialization => Deserialization
: Request => Future [ Response ]
trait UserService { def getByUserId( userId : Long ) : Future [ User ] def getByScreenName( screenName: String ) : Future [ User ] } trait TweetService { def findByUserId( userId : Long ) : Future [ Seq[ Tweet ] ] }
trait UserTweetService { val userService : UserService val tweetService : TweetService def findUserAndTweets( userId : Long ) : Future [ ( User, Seq[Tweet] ) ] = Future.join ( userService.findByUserId( userId ), tweetService.findByUserId( userId ) ) } } 1 4 2 3 2 3
trait ScreenNameTweetService { val userService : UserService val tweetService : TweetService def findByScreenName( screenName: String ) : Future [ Seq[Tweet] ] = { userService.findByScreenName( screenName ) flatMap { user => tweetService.findByUserId( user.id ) } } } 1 6 2 3 4 5
other benefits ...
val someService = Http.client(“inet!google.com:80”) val anotherService = Http.client( “zk!myzkhost.mycompany.com:2181!/my/zk/path��� ) Address Resolution
Source Load Balancing vs
Thanks! twitter.github.io/finagle @finagle @pzdk

More Related Content

Finagle By Twitter Engineer @ Knoldus

  • 2. puneet@twitter.com Core Services - Platform Engineering
  • 7. A brave new world ... Typesafe Expressive Performant (thank you JVM) ...
  • 9. Synchronous Futures def piDigit ( n : Int ) : Int def piDigit ( n : Int ) : Future[Int] println ( piDigit ( 100 ) ) piDigit ( 100 ) onSuccess println
  • 11. Synchronous Futures def piDigit ( n : Int ) : Int def piDigit ( n : Int ) : Future[Int] println ( piDigit ( 100 ) ) piDigit ( 100 ) onSuccess println println ( piDigit ( 100 ) * 10 ) ) piDigit ( 100 ) map { _ * 10 } onSuccess println println ( piDigit ( piDigit ( 100 ) ) ) piDigit ( 100 ) flatMap piDigit onSuccess println println ( ( 0 to 100 ) map piDigit ) Future.collect { ( 0 to 100 ) map piDigit } onSuccess println
  • 13. the networking glue ... Address resolution TCP handshake Serialization => Deserialization
  • 14. : Request => Future [ Response ]
  • 15. trait UserService { def getByUserId( userId : Long ) : Future [ User ] def getByScreenName( screenName: String ) : Future [ User ] } trait TweetService { def findByUserId( userId : Long ) : Future [ Seq[ Tweet ] ] }
  • 16. trait UserTweetService { val userService : UserService val tweetService : TweetService def findUserAndTweets( userId : Long ) : Future [ ( User, Seq[Tweet] ) ] = Future.join ( userService.findByUserId( userId ), tweetService.findByUserId( userId ) ) } } 1 4 2 3 2 3
  • 17. trait ScreenNameTweetService { val userService : UserService val tweetService : TweetService def findByScreenName( screenName: String ) : Future [ Seq[Tweet] ] = { userService.findByScreenName( screenName ) flatMap { user => tweetService.findByUserId( user.id ) } } } 1 6 2 3 4 5
  • 19. val someService = Http.client(“inet!google.com:80”) val anotherService = Http.client( “zk!myzkhost.mycompany.com:2181!/my/zk/path” ) Address Resolution