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[OpenDaylight] Migrating to AKKA 2.6.X | has enabled OpenDaylight to migrate to the current version of AKKA, 2.6.x. Today, we will review recent changes to AKKA, which is the heart of OpenDaylight’s Clustering functionality.

As the largest committer to the OpenDaylight source-code, will regularly keep you updated and posted about our efforts in projects surrounding OpenDaylight.

Released in November 2019, added many improvements, including better documentation, and introduced a lot of new features. In case you are new to AKKA, here is a description from the official website:

[It is] a set of open-source libraries for designing scalable, resilient systems that span processor cores and networks. [AKKA] allows you to focus on meeting business needs instead of writing low-level code to provide reliable behavior, fault tolerance, and high performance.

OpenDaylight Migrates to AKKA 2.6

Make sure to check out the AKKA Migration Guide 2.5.x to 2.6.x, and the OpenDaylight page!

AKKA Typed

In a typed API, each actor declares an acceptable message type, and only messages of this type can be sent to the actor. This is enforced by the system.
For untyped extensions, seamless access is allowed.

The classic APIs for modules, such as Persistence, Cluster Sharding and Distributed Data, are still fully supported, so the existing applications can continue to use those.


Artery provides more stability and better performance for systems using AKKA Cluster. Classic remoting is deprecated but still can be used. More information is provided in the migration guide.

Jackson-Based Serialization

Distributed Publish-Subscribe

Passivation in Cluster

Cluster: External shard allocation

Sharded Daemon Process

Originally published at on February 1, 2021.

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