Posted by Yufan Gong on March 9, 2020
Days are getting longer🌻, March has arrived. Here’s what we have done in this release.
- finagle-opencensus-tracing: Add support for providing a custom TextFormat for header propagation. a02d377a
Posted by Yufan Gong on March 9, 2020
Days are getting longer🌻, March has arrived. Here’s what we have done in this release.
Posted by Ian Bennett on February 27, 2020
It is ⌛time to take a 👀 look back on the 🌇 twilight of the year 2019, when the seasons shift from 🍂 Fall to Winter ❄️. Across our projects, we have introduced support for JDK 11 and added support for Scala 2.13 across a large portion...Read more...
Posted by Moses Nakamura on February 4, 2020
Welcome to the optometrically significant year–the year of perfect hindsight 🤓
Posted by Bryce Anderson on December 13, 2019
The seasons changed and depending on which hemisphere you’re in it’s time to enjoy either the snow ❄️ or the sun ☀️!
DarkTrafficFilterto identify which span is dark, as well...
Posted by Dave Rusek on November 5, 2019
Now that Halloween has come and gone, it’s time to get ready for cold weather fun! ❄️
Posted by Yufan Gong on October 23, 2019
Fall has arrived in the Northern Hemisphere 🌍🌎🌏, and in San Francisco, we are enjoying the light breeze🎐and warm sunshine☀️. Here are some quick highlights of our work from July, August, and September. If you want to keep an 👁 on our...Read more...
Posted by Christopher Coco on October 9, 2019
In preparation for Halloween 👻 at the end of the month, we are very happy to announce our October 🕷️ release: no tricks 🎃 – all treats 🍬.
Posted by Jing Yan on September 10, 2019
Embrace a beautiful fall with our freshly baked September release! 🍪
Posted by Yufan Gong on August 15, 2019
A point release to publish Util on scala 2.13.
addGauge become final, override
Posted by Kevin Oliver on August 7, 2019
Hot off the press — the August releases. Here’s what’s what.
Posted by Christopher Coco on July 26, 2019
Summer ⛱️ is now in full-effect around the world 🌍 but we interrupt your travel 🚙and ice cream 🍦 to quickly highlight the 🆒 things released over the spring and early summer 🐚 months of April, May, and June. Just a note, if you’d like...Read more...
Posted by Dorothy Ordogh on July 18, 2019
Posted by Ruben Oanta on June 19, 2019
We’ve cut a June release for our libraries! Here are some highlights:
util-core: Use Local at callback creation for a Future’s interrupt handler rather than
the raiser’s locals so that it is consistent with other callbacks. We believe...
Posted by Moses Nakamura on May 29, 2019
Spring has sprung, and we’re beginning to ease into summer. 🚲season has begun in New York City! We’ve been busy little bees, and this review comes a little bit late, so it won’t include all of the work we’ve done since the last review...Read more...
Posted by Ryan O'Neill on May 21, 2019
With it being late May, the beginning of summer is right around the corner. Along with that comes a new release of our libraries. Unfortunately, there was an issue with our first attempt (19.5.0) so we created a point release (19.5.1), which fixes...Read more...
Posted by Vladimir Kostyukov on April 19, 2019
Posted by Ian Bennett on March 14, 2019
Spring has almost sprung, so take a look at all that we have done!
Posted by Yufan Gong on February 20, 2019
It is the rainy season in San Francisco, grab a cup of hot tea and take a look at our new February release!
finagle-core: Added gauge
is_marked_dead as an indicator of whether the host is marked
as dead(1) or not(0) in
Posted by Dave Rusek on January 18, 2019
Winter is in full swing, a new year is upon us, and the coyotes are still doing their thing, and so are all of us here at Twitter. As part of your new year resolutions please make it a point to check out the latest releases of our open source offerings...Read more...
Posted by Ryan O'Neill on January 14, 2019
Happy New Year folks! Hopefully new years resolutions are still on pace. In the meantime, let’s kick off 2019 with a fresh new release of libraries.
c.t.f.s.StackBasedServer has been changed to extend the
Posted by Moses Nakamura on December 18, 2018
It’s hot chocolate season in the big apple. That means mittens, ice-skating, and curling up by the radiator. Grab your puffer, it’s the most beautiful time of the year.
finagle-redis: Add support for the new stream API released...
Posted by Dave Rusek on November 13, 2018
Halloween has come and gone and it’s already snowing here in the Rockies. Time to cuddle up with a warm compiler and check out the new edition of Twitter’s open source libraries!
Posted by Neuman Vong on October 24, 2018
Here we are in the month of October, just a few weeks until creatures of fantasy roam the streets together with people dressed up as creatures of fantasy 👹.
Speaking of the fantastic, we have new releases!Read more...
Posted by Neuman Vong on October 18, 2018
Fall is here! If you live in Boulder, you might take a 🚶and watch coyotes hunt prairie dogs. The new season brings about a change of clothes, but what about a change of code? Upgrade to the latest Finagle version and enjoy the new features, APIs, and...Read more...
Posted by Christopher Coco on October 3, 2018Read more...
Posted by Ryan O'Neill on September 27, 2018
September is beach season here in the Bay Area, and it looks like our release earlier this month got caught in a wash cycle. So, we’ve made a point release.
See below for details on the
util-slf4j-api dependency fix for the reason
why we decided to...
Posted by Jordan Parker on September 18, 2018
September is beach season here in the Bay Area! Time to finally get out to the beach and cut fresh new versions of our libraries.
Posted by Kevin Oliver on August 7, 2018
Fogust is upon us and brings the August releases.
finagle-core: Introducing the new
c.t.f.tracing.Tracing API for more efficient tracing...
Posted by Jordan Parker on July 19, 2018
Believe it or not, summer is in full swing and it’s once again time to take stock of where we’ve been and where we’re headed. For a full list of changes over the past quarter, check out the older posts on this blog.
We’ve continued to...Read more...
Posted by Daniel Schobel on July 11, 2018
Hot off the presses, the July releases are here!
Runtime Behavior Changes:
finagle-core: Server-side rejections from
Posted by Christopher Coco on June 15, 2018
Just in time for the official start to summer 🏝 our June releases are here!
Runtime Behavior Changes:
finagle-core: By default, the deterministic aperture...
Posted by Vladimir Kostyukov on May 8, 2018
Good news, everyone! Finagle & Finatra May releases are here!
As usual, all the corresponding Github projects for Finagle, Finatra, Util, Twitter Server, and Scrooge have their release pages updated:Read more...
Posted by Kevin Oliver on April 18, 2018
It’s time to take a look back at what went down with Finagle, Finatra & friends over the past three months, and get an idea of what’s to come. As projects don’t tend to care about quarterly boundaries, some of our work is a work in progress.
Posted by Bryce Anderson on April 11, 2018
Our April releases have arrived!
c.t.f.filter.NackAdmissionFilter can now be disabled via a
Posted by Stefan Lance on March 6, 2018
Our March releases have arrived!
c.t.f.client.BackupRequestFilter.filterService for wrapping raw services in a
Posted by Yufan Gong on February 5, 2018
Happy Lunar New Year! The February release is here.
finagle-core: Add orElse to allow composition of
Posted by Daniel Schobel on January 25, 2018
We’ve been running scalac around the clock to fend off the cold and bring you another quarter’s worth of features and improvements to Finagle and Friends: Finagle, Finatra, Scrooge, TwitterServer, Util
Future received a more efficient...Read more...
Posted by Christopher Coco on January 17, 2018
Time to turn the calendar to a new year and a new release — our January release is here!
FailureDetector has a new method...
Posted by Isabel Martin on December 12, 2017
The December release has arrived!
finagle-core: Expose Tunables for MethodBuilder timeout configuration. Update the http.MethodBuilder...
Posted by Kevin Oliver on December 12, 2017
We have been minimizing our dependency on Guava, which is big and often causes version conflicts for our users. This work will be released as part of January’s 18.1 release, though there are 2 places it remains:
util-cache-guava has a
Posted by Moses Nakamura on November 17, 2017
It’s November, and you know what that means! Library releases!!! We’re now publishing with sbt 1.0.x, and we now also publish sbt-scrooge-plugin for sbt 1.0.x. We are also continuing to publish sbt-scrooge-plugin for sbt 0.13.x.Read more...
Posted by Stefan Lance on November 2, 2017
If you’ve ever tried to debug asynchronous code written with Twitter
you may have found that the stack trace isn’t always helpful. The stack trace
at a given point in the program includes the active stack frames and thus shows
the chain of...
Posted by Jordan Parker on October 27, 2017
The October releases have arrived! For this release and hereafter, Finagle, Finatra, Scrooge, Util, and TwitterServer will be versioned as $year.$month.$patch, as opposed to $major.$minor.$patch. This means that all project versions will be in sync...Read more...
Posted by Kevin Oliver on October 18, 2017
Seven years ago a simple commit got Finagle’s open source repository started. Finagle began as a means of dealing with the complexity and fragility of distributed systems issues here at Twitter. While distributed systems remain complex and it is not...Read more...
Posted by Christopher Coco on October 12, 2017
As we move headlong into Autumn we thought this might be a good time to take a quick look back at some of the work from the previous quarter in Finagle, Finatra, Scrooge, TwitterServer, and Util and preview what we’re working on this quarter and beyond...Read more...
Posted by Kevin Oliver on September 7, 2017
The September releases are here.
finagle-core: If a
c.t.u.tunable.Tunable request or total timeout has been configured
on a client which...
Posted by Daniel Schobel on August 17, 2017
The August release is here and brings a major version bump for both Finagle and Util to v7! 🍰🍰🍰
Over the last few years Finagle has had an extensive internal overhaul to support Netty 4 along with a rewrite of all its protocols so now as the last...Read more...
Posted by Kevin Oliver on July 12, 2017
It’s time to take a look back at what went down in Finagle, Finatra and related libraries over the past few months and get an idea of what’s to come. This covers the April and June releases (apologies for missing May) as well as the upcoming 7.0.0...Read more...
Posted by Eitan Adler on June 9, 2017
We have integrated CLA Assistant with the Finagle Github repository.
Due to lack of discoverability, not everyone has been consistent about signing Twitter’s existing CLA. We believe that this will be less of a burden than manually checking CLAs against...Read more...
Posted by Kevin Oliver on April 6, 2017
As mentioned in our spring planning notes, we are sunsetting a number of modules that have been unsupported or exist in a zombie-like state.
The upcoming...Read more...
Posted by Kevin Oliver on March 20, 2017
The team working on Finagle, Finatra, and related libraries met last week and did our planning for the next three months. These are high-level goals and as such, have varying degrees of confidence and certainty.
Posted by Kevin Oliver on March 14, 2017
Here’s a few of the highlights:
See accompanying blog post for details.
Posted by Vladimir Kostyukov on February 6, 2017
It’s been quite a while since the Netty 4 migration in Finagle was initially announced. We’ve travelled a long way and are happy to announce that there is now (as of Finagle 6.42) support for Netty 4 transports in most of the protocols: Thrift, ThriftMux...Read more...
Posted by Jillian Crossley on December 23, 2016
As the year ends, we’ve got an exciting new release for you! Here’s a quick rundown of what we’ve been up to.
Finagle, Util, Ostrich, Scrooge, and Twitter-Server are all now cross-compiled for Scala 2.11 and 2.12(!)
Posted by Bryce Anderson on November 29, 2016
Historically Finagle has depended on a forked org.apache.thrift libthrift version 0.5.x, which happens to not be published to the Central Repository. We have published the artifact to maven.twttr.com, but this requires users to add the maven.twttr...Read more...
Posted by Kevin Oliver on September 1, 2016
💔 SPOILER ALERT: you do not want to go to this party 💔Read more...
Posted by Vladimir Kostyukov on July 8, 2016
This is Finagle’s first release only for Java 8 and Scala 2.11. Since the previous release, the team has been focusing on the Netty 4 migration as well as eliminating some technical debt.
The team is firing on all cylinders towards...Read more...
Posted by Kevin Oliver on May 19, 2016
While this was released as part of Finagle 6.33.0 we...Read more...
Posted by Kevin Oliver on April 20, 2016
The upcoming releases of our family of projects will be the final release for Scala 2.10 and Java 7. These should be:
Java 7 reached its end-of-life in April...Read more...
Posted by Vladimir Kostyukov on March 11, 2016
This release we’ve been focusing on improving both overall stability of Finagle components and debugging features. We also reverted a patch that cased duplicate tag error that looks as follows.
com.twitter.finagle.mux.ServerError: Duplicate tag 6
Posted by Moses Nakamura on February 15, 2016
tl;dr AsyncStream is replacing Spool.
Big shoutout to Neuman Vong, who designed and built AsyncStream soup to nuts ✧٩(•́⌄•́๑)Read more...
Posted by Kevin Oliver on February 9, 2016
Finagle’s new response classifiers improve client’s avoidance of faulty nodes thus increasing your success rate. To get this benefit, you must wire up the application’s rules into your clients and how to do so is explained below.
First, a pop quiz...Read more...
Posted by Kevin Oliver on February 8, 2016
Ever had your service attacked by a retry storm from your clients? Or your clients’ clients? Or has your service ever been the attacker in one of those situations?
To help you avoid this, in release 6.31 we’ve introduced the notion of...Read more...
Posted by Vladimir Kostyukov on February 5, 2016
In this milestone, we’ve been focusing on two major directions:
There is a new user-friendly API for configuring...Read more...
Posted by Nik Shkrob on September 10, 2015
This allows the use of Finagle filters with Thrift services to do retries, timeouts, etc. in a Finagle-idiomatic...Read more...
Posted by Travis Brown on July 29, 2015
FinagleCon is just over two weeks away, and we’re looking for a few attendees who are interested in giving lightning talks to kick off the afternoon. The talks will be capped at five minutes and can be on a wide range of Finagle-related topics: how you’re using Finagle, suggested changes, far-fetched experiments, integration with other libraries or tools, etc. Read more...
Posted by Travis Brown on July 16, 2015
Most of Twitter’s open source projects for the JVM are published to Maven
Central, but for various reasons a few are still published to
maven.twttr.com, a Maven repository that is hosted by Twitter. While Finagle
itself is in Maven Central, some of its subprojects and some
Finagle-related libraries and tools require dependencies from
We’re actively working to eliminate the need for this separate repository, but we don’t have a definite timeline for moving everything to Maven Central, and so this week we have enabled secure access to the repository, which was previously only available over unsecured HTTP. Read more...
Posted by Travis Brown on July 15, 2015
We’re pleased to announce that this year’s FinagleCon will now be hosted at Twitter’s new One 10th Street Expansion in San Francisco. We believe that this location will be more convenient than the Kaiser Center in Oakland for many attendees, and we’re looking forward to showing off this brand new space. Read more...
Posted by Travis Brown on June 11, 2015
Yesterday we opened registration and the call for participation for FinagleCon, a new annual conference for the Finagle community. This year’s conference will be a Scala by the Bay event hosted at Twitter HQ in San Francisco, and will take place on Thursday, August 13, the day before Scala by the Bay begins.
The conference program will include keynotes by Twitter’s Marius Eriksen and SoundCloud’s Phil Calçado, talks by Finagle adopters and contributors, and workshops and tutorials on a range of Finagle-related topics (including Finatra and Finch). Read more...
Posted by Travis Brown on February 6, 2015
Most internal services at Twitter speak the Thrift protocol, which provides many benefits—once you’ve defined your data types and service interfaces, for example, it’s possible to create bindings for a wide range of programming languages, and Twitter’s Scrooge in particular makes it easy to create high-performance Finagle servers and clients for your Thrift interfaces.
In some cases, though, it would be more convenient not to have to worry about things like interface description files, the build system plugins necessary to generate bindings from them, etc. In particular, being able to define Finagle services that take arbitrary types as inputs and outputs in a Scala REPL would make writing tutorials and quickstart projects much more straightforward, and would enable easier experimentation with other parts of the Finagle API. Read more...
Posted by Vladimir Kostyukov on December 10, 2014
At Konfettin we decided to build a REST API backend using a Finagle stack. While it’s possible to do that using pure Finagle abstractions, we ended up writing the Finch library to simplify things and get more suitable building blocks. And it worked well: we shipped the product and got the customers. This library has been running in production for about six months so far and it’s pretty stable and well-tested. This post gives an overview of Finch: explains its core design principles and use cases. Read more...
Posted by Travis Brown on October 30, 2014
Part of my role as an open source advocate for Scala projects at Twitter involves talking to developers outside of Twitter about how we can make our open source projects more widely useful and accessible, and one of the most common requests for Finagle is for more introductory tutorials and examples.
One of the steps we’re taking in this direction is a major overhaul of
which we’ll be moving out of the main Finagle repository and
into its own project under the Finagle organization
on GitHub. At the same time we’ll be
filling out the top-level introduction to the examples (which is currently a
adding more detailed API documentation, providing better example coverage for
and creating a larger set of
to show off our new work on improving Java compatibility.
Posted by Sonja Keserovic on October 20, 2014
Netty 4 was released more than a year ago and Netty 5 Alpha is already available. Finagle is still using Netty 3, which is getting outdated quickly and is preventing us from taking advantage of various performance improvements in newer versions. It’s also creating additional work for the Finagle team at Twitter as we need to port important security and performance fixes back to Netty 3. Read more...
Posted by Kevin Oliver on October 7, 2014
For Finagle and its associated libraries, known internally at Twitter as the Core Systems Libraries, we plan to change the way we push code to GitHub and publish releases. The other libraries included are util, twitter-server, ostrich, and scrooge. Read more...
Posted by Moses Nakamura on August 12, 2014
We’re experimenting with a new form of release notes, so that it’s easier to get context on what’s going on in Finagle-land, especially with an eye to letting consumers see what the latest and greatest features are, and providing a little more context around what’s going on. Read more...
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.