Cassandra vs r2dbc. What to choose?

Akka
1

Many changes to persistence are implemented in r2dbc. Does this mean that the emphasis is on r2dbc, and Cassandra goes by the wayside for Lightbend?

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2

It’s right that many of the new features are based on the r2dbc plugin. Here are some of these features that is missing in the Cassandra plugin if comparing them:

  • Projections with eventsBySlices instead of by tags, and thereby possibility to change number of projection instances at runtime without migrations
  • Projections exactly-once
  • Projections over gRPC
  • Replicated Event Sourcing over gRPC
  • Low latency Projections
  • Projections starting from snapshot
  • Shared query stream for supporting many Projection instances
  • Durable State and Durable State query representation without Projection

For a new project I would therefore recommend the R2DBC plugin, unless Cassandra is the only operations alternative.

That said, the Cassandra plugin is used by many and works well for it’s current feature set.

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