The release of Valkey 9.0 includes new features along with requested improvements to the open source data store.

For example, the new atomic slot migrations capability “fundamentally changes how Valkey migrates data from node-to-node inside the cluster,” says Kyle Davis in the announcement.

Unlike the previous key-by-key approach, “the new atomic slot migration doesn’t migrate keys directly, instead, the move-then-delete sequence is on the entire slot; the original node still retains all the keys and data until the entire slot migration is complete avoiding the pre-Valkey 9.0 issues with redirects or retries.”

Valkey 9.0 has also updated the hash field expiration process with new commands for more flexibility and added full support for numbered databases in cluster mode, clearing the way for “a whole host of use cases and some very handy clustering characteristics,” the announcement says.

Check out the documentation and usage guides for detailed information about Valkey.