Release Dates

  • KIP Freeze: May 14 (Wednesday)
    • A KIP must be accepted by this date in order to be considered for this release. Note, any KIP that may not be implemented in a week, or that might destabilize the release, should be deferred.
  • Feature Freeze: June 4 (Wednesday)
    • major features merged & working on stabilisation, minor features have PR, release branch cut; anything not in this state will be automatically moved to the next release in Jira
  • Code Freeze: June 25 (Wednesday)
  • At least two weeks of stabilization will follow Code Freeze, meaning we expect to release no earlier than July 9.


These dates are goals and subject to change, but we expect to stay on the Time Based Release Plan unless unexpected critical issues come up. While the earliest possible release date is 2w after code freeze, release candidates (RCs) will roll out as needed until the release vote passes.

The release manager is Mickael Maison 

How to Contribute

Before code freeze:

  • Participate in votes and discussions to land or postpone the open KIPs.
  • Review patches. We anticipate that this release, as it usually happens, will be bottlenecked mostly on reviews. The more reviewers, the more content we can fit in.
  • Write unit/integration/system tests. We want to preserve the tradition of high-quality releases in Apache Kafka. 

After code freeze:

  • Write more unit/integration/system tests. We want to preserve the tradition of high-quality releases in Apache Kafka.
  • Improve documentation.
  • Test the release candidates. 
  • Open blocker JIRAs on critical issues found. Open non-blocker JIRAs on any other issues found.
  • Fix critical bugs.
  • Review bug fixes.
  • Vote on release candidates. Even though only PMC votes are binding, community votes are super important as we evaluate the readiness of the release.

Open Issues

Key Summary T Created Updated Due Assignee Reporter P Status Resolution
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Also, feel free to refer to the 4.1.0 release page for more details of the included tickets (requires logging in to the Apache Kafka Jira project).

Planned KIP Content

Note: The planned content is not binding - the final content will be based on the features committed by the branch-cutting date.

See Kafka Improvement Proposals for the full list of KIPs.

If you do not see your KIP here and want to, please reply to the mailing list thread about the release!

KIPJIRAComponentStatus
KIP-1166: Improve high-watermark replication

KAFKA-19223 - Getting issue details... STATUS

CoreAccepted
KIP-1143: Deprecated Optional<String> and return String from public Endpoint#listenerName

KAFKA-18760 - Getting issue details... STATUS

ClientsAccepted

KIP-1139: Add support for OAuth jwt-bearer grant type

KAFKA-18573 - Getting issue details... STATUS

ClientsAccepted
KIP-1109: Unifying Kafka Consumer Topic Metrics

KAFKA-12469 - Getting issue details... STATUS

ClientsComplete
KIP-1103: Additional metrics for cooperative consumption

KAFKA-17894 - Getting issue details... STATUS

CoreComplete
KIP-1111: Enforcing Explicit Naming for Kafka Streams Internal Topics

KAFKA-18023 - Getting issue details... STATUS

StreamsComplete
KIP-1092: Extend Consumer#close with an option to leave the group or not

KAFKA-16758 - Getting issue details... STATUS

ClientsAccepted
KIP-1071: Streams Rebalance Protocol

KAFKA-17125 - Getting issue details... STATUS

StreamsAccepted – targeting EA
KIP-1052: Enable warmup in producer performance test

KAFKA-17645 - Getting issue details... STATUS

ToolsAccepted
KIP-1035: StateStore managed changelog offsets

KAFKA-17411 - Getting issue details... STATUS

StreamsAccepted
KIP-1034: Dead letter queue in Kafka Streams

KAFKA-16505 - Getting issue details... STATUS

StreamsAccepted
KIP-1023: Follower fetch from tiered offset

KAFKA-15433 - Getting issue details... STATUS

CoreAccepted
KIP-1020: Move `window.size.ms` and `windowed.inner.class.serde` from `StreamsConfig` to TimeWindowedDe/Serializer and SessionWindowedDe/Serializer class

KAFKA-16260 - Getting issue details... STATUS

StreamsComplete
KIP-939: Support Participation in 2PC

KAFKA-15370 - Getting issue details... STATUS

CoreAccepted
KIP-932: Queues for Kafka

KAFKA-16092 - Getting issue details... STATUS

CoreAccepted - targeting Preview
KIP-892: Transactional Semantics for StateStores

KAFKA-14412 - Getting issue details... STATUS

StreamsAccepted

KIP-877: Mechanism for plugins and connectors to register metrics

KAFKA-15995 - Getting issue details... STATUS

Clients/Core/ConnectClients and Connect: Complete
Server: In progress

Postponed to subsequent release

KIPJIRAComponentStatus










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