Akka Projections 0.3 released

We’re happy to release another milestone of Akka Projections, version 0.3. This version includes almost all features that we intend for upcoming 1.0.0. Telemetry is not fully completed yet. The API should be fairly stable from now on, but it might be changed based on feedback from initial usage. Feedback, bug reports and feature requests are welcome as issues in akka-projection/issues.

Highlights of the release:

  • Projections and offset storage in a relational DB with JDBC, including support for JPA/Hibernate and other database libraries.
  • Verify revoked partitions in the KafkaSourceProvider.
  • Cross build for Scala 2.12 and 2.13.
  • Support processing with actors.
  • Handler factory instead of a handler instance (API change).
  • ProjectionContext in atLeastOnceFlow (API change)
  • Documentation improvements and additions
  • ShoppingCart CQRS example updated to use Projections: https://github.com/akka/akka-samples
  • Internal refactoring to use mostly same implementation for CassandraProjection, SlickProjection and JdbcProjection
  • Telemetry SPI

The documentation can be found at https://doc.akka.io/docs/akka-projection/current/.

A total of 25 issues were closed in this release. The complete list can be found on the 0.3 milestone on github.


For this release we had the help of 4 committers – thank you all very much!

commits  added  removed
     38   8772     3758 Renato Cavalcanti
     23   3182      738 Patrik Nordwall
      5    250      136 Sean Glover
      4   1644      143 Ignasi Marimon-Clos

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Happy hakking!

– The Akka Team

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