- MSK now supports in‑place migration from ZooKeeper to KRaft, letting existing clusters switch without provisioning new infrastructure or client changes.
- Customers upgrade to Kafka 3.9.x, then initiate migration via console, CLI, or API; the cluster remains available throughout the process.
- The feature enables a path to Kafka 4.x (KRaft‑only) and is available in all MSK regions except the European Sovereign Cloud.
Amazon MSK now supports in-place migration from Apache ZooKeeper to KRaft
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