Dear hAkkers,

We—the Akka committers—are pleased to be able to announce the availability of Akka 2.4.1.

This release contains a few important fixes and improvements:

• Shard region now kills shards more consistently on HandOff
• An empty shard region now shuts down correctly on graceful shutdown
• Using the distributed data mode the sharding coordinator updates correctly after leader downing
• Possibility to provide a custom supervision strategy for the BackOffSupervisor
• Problem with split brain on cluster startup under some circumstances solved
• A new Supervisor that supports exponential restart back-off semantics for actors regardless of their lifecycle model (the BackoffSupervisor overloads the meaning of self-termination)

The complete list of closed tickets can be found in the 2.4.1 github issues milestone.

Akka 2.4.1 is released for Scala 2.11, 2.12.0-M3 and Java 8.

Migrating from Older Relases

When migrating an existing project from Akka 2.3.x please have a look at the migration guide.

Additional Release Details

The artifacts comprising this release have been published to https://oss.sonatype.org/content/repositories/releases/ and also to Maven Central. In addition, we adopted the sbt standard of encoding the Scala binary version in the artifact name, i.e. the core actor package’s artifactId is “akka-actor_2.11”.

Credits

commits added removed
 22    1636     411 Patrik Nordwall
  8     542      57 Konrad Malawski
  7    1418     151 Johan Andrén
  7     246     815 Andrea
  5       9       9 Markus Hauck
  2      57      65 Martynas Mickevičius
  2     580       5 Anton Karamanov
  2      58      11 Roland Kuhn
  2       6       6 kukido
  2       2       2 Jaca777
  2      34       7 Jan Ypma
  1      35       4 Evgeny Shepelyuk
  1      19       1 Nils-Helge Garli Hegvik
  1       3       3 Stefan Wachter
  1      30       7 Heiko Seeberger
  1     903      16 Kailuo Wang
  1       2       2 michaelom
  1     342       9 Henry Mai
  1      33      18 Krzysztof Bochenek
  1       4       4 cheehau.lim
  1      17       4 lolski
  1      14       3 Marcin Sosnicki
  1       7       0 Martin Grotzke
  1     242      14 Endre Sándor Varga
  1     127      21 Michal Lacko
  1      74       3 Ievgenii.Shepeliuk
  1       0       1 Oleg

Happy hAkking!