Finagle 6.43 Release Notes

The March releases are hot off the printing press for Finagle 6.43.0, Finatra 2.9.0, Scrooge 4.15.0, TwitterServer 1.28.0, and Util 6.42.0.

Here’s a few of the highlights:

Finatra

See accompanying blog post for details.

Finagle

• finagle-http now classifies server error status codes (500s) as failures. This affects success rate metrics and failure accrual. See the com.twitter.finagle.http.serverErrorsAsFailuresV2 toggle for opting out of this behavior. f34a7344
• The finagle-http APIs continue their trek to rid themselves of having Netty 3 in its public API.
• finagle-http now has experimental http/2 support. To try it out, pass the command line parameter -com.twitter.finagle.toggle.flag.overrides=com.twitter.finagle.http.UseHttp2=1.0. Please let us know of any issues that you run into!

Scrooge

• The Scala code generator now supports annotations on enums, enum fields, services, and service functions. 4821b46e
• Scala’s types for ServiceIfaces are now a Service from ThriftMethod.Args to ThriftMethod.SuccessType, instead of ThriftMethod.Args to ThriftMethod.Result. This is a breaking API change though it should generally be easy to adapt existing code to it. c5ea8515

Util

Our byte-level abstraction, Buf got a fresh coat of paint:

• Introduce Buf.process for sequential processing of a Buf. Finagle has been updated to use it where appropriate, leading to reductions in allocations. 1df3646f and others
• Introduce Buf.write(java.nio.ByteBuffer) for writing to NIO ByteBuffers. d6f7985e
• Buf.concat is now a constant time operation. bb05f425
• ConcatBuf has been removed, replaced by Buf.apply and Buf.Composite. 5833c560

Dependencies

Guava has been upgraded to version 19.0 from 16.0.1 d6bdecc9

Changelogs

• Finagle 6.43.0
• Util 6.42.0
• Scrooge 4.15.0
• TwitterServer 1.28.0
• Finatra 2.9.0