Release Dates

  • KIP Freeze:   (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:   (major features merged & working on stabilization, minor features have PR, release branch cut; anything not in this state will be automatically moved to the next release in JIRA)
  • Code Freeze:  
  • At least two weeks of stabilization will follow Code Freeze.


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 testsWe 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 Priority Priority Priority Priority P Status Resolution
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Also feel free to refer to the 3.5.0 release page for more details of the included tickets (requires log in to the Apache Kafka Jira project).

Planned KIP Content

Note: The planned content is not binding - final content will be based the features committed by branch-cutting date. See Kafka Improvement Proposals for the full list of KIPs.

KIPJIRAComponentStatus
KIP-405: Kafka Tiered Storage

KAFKA-7739 - Getting issue details... STATUS

core
KIP-581: Value of optional null field which has default value

KAFKA-8713 - Getting issue details... STATUS

connectDone
KIP-710: Full support for distributed mode in dedicated MirrorMaker 2.0 clusters

KAFKA-10586 - Getting issue details... STATUS

connectDone
KIP-726: Make the "cooperative-sticky, range" as the default assignor

KAFKA-12473 - Getting issue details... STATUS

clients
KIP-770: Replace "buffered.records.per.partition" with "input.buffer.max.bytes"

KAFKA-13152 - Getting issue details... STATUS

streams
KIP-797: Accept duplicate listener on port for IPv4/IPv6

KAFKA-13299 - Getting issue details... STATUS

corePR available
KIP-813: Shareable State Stores

KAFKA-10892 - Getting issue details... STATUS

streamsPR available
KIP-821: Connect Transforms support for nested structures

KAFKA-13656 - Getting issue details... STATUS

connect
KIP-844: Transactional State Stores

KAFKA-12549 - Getting issue details... STATUS

streamsPR available
KIP-847: Add ProducerIdCount metrics

KAFKA-13999 - Getting issue details... STATUS

coreDone
KIP-862: Self-join optimization for stream-stream joins

KAFKA-14209 - Getting issue details... STATUS

streams
KIP-863: Reduce Fetcher#parseRecord() memory copy

KAFKA-14715 - Getting issue details... STATUS

clientsPR available
KIP-866 ZooKeeper to KRaft Migration

KAFKA-14304 - Getting issue details... STATUS

core
KIP-884: Add config to configure KafkaClientSupplier in Kafka Streams

KAFKA-14395 - Getting issue details... STATUS

streamsDone
KIP-887: Add ConfigProvider to make use of environment variables

KAFKA-14376 - Getting issue details... STATUS

clientsPR available
KIP-889: Versioned State Stores

KAFKA-14491 - Getting issue details... STATUS

streams
KIP-893: The Kafka protocol should support nullable structs

KAFKA-14425 - Getting issue details... STATUS

coreDone


Postponed to subsequent release

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