Alpakka 2.0.0 RC2 released

Dear Hakkers,

The Alpakka contributors are happy to announce a second release candidate for Alpakka 2.0!

What is Alpakka?

The Alpakka project is an open source initiative to implement stream-aware and reactive integration pipelines for Java and Scala. It is built on top of Akka Streams, and has been designed from the ground up to understand streaming natively and provide a DSL for reactive and stream-oriented programming, with built-in support for backpressure. Akka Streams is a Reactive Streams and JDK 9+ java.util.concurrent.Flow-compliant implementation and therefore fully interoperable with other implementations.

About 2.0

Things have taken much longer than we initially hoped and we hope the earlier milestone releases made it possible for the impatient users of Alpakka to try out the current versions and fixes.

The major version tick for Alpakka is due to major upgrades and changes in the dependencies used by the various connectors. Some Alpakka APIs changed as well, but we try to keep those changes minimal.

Alpakka 2.0 updates dependencies for most connectors.

Most notable changes in RC2 (compared to RC1)

  • NEW Pravega connector #2149 by @cheleb
    Pravega provides a new storage abstraction - a stream - for continuous and unbounded data. A Pravega stream is an elastic set of durable and append-only segments, each segment being an unbounded sequence of bytes. Streams provide exactly-once semantics, and atomicity for groups of events using transactions.

  • File: TAR archive generation #2241 by @choffmeister

We’ve adapted the Alpakka APIs even more to enable the use of the new actor APIs where possible.

Read the Release notes for all details.


This release candidate contains changes from 8 contributors in the Alpakka community. Thank you all!

Author Commits Lines added Lines removed
ennru ennru 14 306 210
cheleb cheleb 3 1646 19
choffmeister choffmeister 1 478 21
aserrallerios aserrallerios 1 66 21
btomala btomala 1 66 20
MrRexZ MrRexZ 1 10 7
raboof raboof 1 2 2
paualarco paualarco 1 1 1

The way to 2.0.0 final

Please take the RC2 for a spin in your projects and report any glitches. We expect to release the final version before end of April and do not expect more release candidates.

Akka by Lightbend

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Happy hakking,
Your Alpakkas

When will Alpakka Kafka connection offer support for kafka 2.5.1. We want to use Co-operative rebalancing strategy which is more stable in 2.5.1 kafka in our application.

Hi @sunray. Alpakka Kafka 2.1.0-M1 (milestone release), references Apache Kafka 2.6.0. We expect to release an RC soon.

Does this mean that there will be no Alpakka release corresponding to 2.5.1 ?