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Finagle is an extensible RPC system for the JVM, used to construct high-concurrency servers. Finagle implements uniform client and server APIs for several protocols, and is designed for high performance and concurrency. Most of Finagle’s code is protocol agnostic, simplifying the implementation of new protocols.

Finagle is written in Scala, but provides both Scala and Java idiomatic APIs.


We feel that a welcoming community is important and we ask that you follow Twitter’s Open Source Code of Conduct in all interactions with the community. Finagle is actively maintained by Twitter’s infrastructure team, but we have many external contributors as well. The master branch represents the most recent published release while active development happens on the develop branch. Before endeavoring on large changes, please discuss them with the Google groups to receive feedback and suggestions. For all patches, please review our contributing docs.

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