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Apache Kafka

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Velocity5.0

Data streaming

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Kafka 4.2 graduates Share Groups to GA, pulling native queue semantics into the broker.

streamingkafka-queueskraft-migrationshare-groupsbackport-discipline
◆Current state
Apache Kafka is shipping on parallel tracks: the 4.x main line moved 4.2.0 → 4.2.1 → 4.3.0 in three months while 3.9, 4.0, and 4.1 keep receiving backport bugfix releases. 4.3.0 alone bundles 25 KIPs and over 600 commits, and 4.2.0 promoted Share Groups (Kafka Queues) to production-ready.
◆Where it's heading
The headline arc is Share Groups going GA — Kafka now handles message-queue workloads natively with RENEW acknowledgements, adaptive batching, and lag metrics. Alongside that, the 3.9 → 4.x transition still needs maintenance (KIP-1252 patches AlterConfigPolicy parity between ZooKeeper and KRaft), confirming the ZK-to-KRaft migration remains a meaningful operator concern.
◆Prediction
The next 4.x release will likely deepen Share Groups operability — observability, rebalancing behavior, client-library coverage — as ecosystems exercise the GA feature. Expect the ZK-mode bugfix branch to keep accumulating quieter patches until the formal end-of-life is announced.

◆Recent moves

  1. 28d ago

    Apache Kafka 4.2.1 Release Announcement

    4.2.1 bugfix release on the Share-Groups GA branch, with 45 contributors and several critical fixes. Stabilization work for operators who adopted 4.2.0.

    View source ↗
  2. 1mo ago

    Apache Kafka 4.3.0 Release Announcement

    4.3.0 lands 25 KIPs and 600+ commits across all components. Large by volume but the announcement does not single out a category-shifting change — feels like sustained iteration on top of the 4.2 Share-Groups baseline.

    View source ↗
  3. 3mo ago

    Apache Kafka 4.1.2 Release Announcement

    4.1.2 backport bugfix release. Signals that older lines still get active maintenance for operators who haven't moved to 4.2 or 4.3 yet.

    View source ↗
  4. 3mo ago

    Apache Kafka 4.0.2 Release Announcement

    4.0.2 backport bugfix release shipped one day after 4.1.2. Same backport-discipline pattern — Kafka is still feeding multiple supported branches in parallel.

    View source ↗
  5. 4mo ago

    Apache Kafka 3.9.2 Release Announcement

    3.9.2 bugfix release with KIP-1252, patching an AlterConfigPolicy incompatibility between ZooKeeper and KRaft modes. Concrete operator pain on the migration path, addressed cleanly.

    View source ↗
  6. 4mo ago

    Apache Kafka 4.2.0 Release Announcement

    ⚡ SPARK

    4.2.0 promotes Share Groups (Kafka Queues) to production-ready with RENEW acks, adaptive batching, soft/strict fetch-quantity enforcement, and lag metrics — the foundation the subsequent 4.2.1, 4.3.0, and current-state framing all rest on.

    View source ↗