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-399: Extend ProductionExceptionHandler to cover serialization exceptions

KAFKA-7499 - Getting issue details... STATUS

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

KAFKA-8713 - Getting issue details... STATUS

connectDone
KIP-641 An new java interface to replace 'kafka.common.MessageReader'

KAFKA-10244 - Getting issue details... STATUS

tool/clientDone
KIP-710: Full support for distributed mode in dedicated MirrorMaker 2.0 clusters

KAFKA-10586 - Getting issue details... STATUS

connectDone
KIP-847: Add ProducerIdCount metrics

KAFKA-13999 - Getting issue details... STATUS

coreDone
KIP-875: First-class offsets support in Kafka Connect

KAFKA-4107 - Getting issue details... STATUS

connect

Partially Done

Includes internal changes + list offsets API

KIP-881: Rack-aware Partition Assignment for Kafka Consumers

KAFKA-14352 - Getting issue details... STATUS

client

Done (updated assignors, 3.4 only had the new protocol)

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

clientsDone
KIP-889: Versioned State Stores

KAFKA-14491 - Getting issue details... STATUS

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

KAFKA-14425 - Getting issue details... STATUS

coreDone
KIP-894: Use incrementalAlterConfig for syncing topic configurations 

KAFKA-14420 - Getting issue details... STATUS

connectDone
KIP-900: KRaft kafka-storage.sh API additions to support SCRAM for Kafka Brokers

KAFKA-14765 - Getting issue details... STATUS

coreDone
KIP-903: Replicas with stale broker epoch should not be allowed to join the ISR

KAFKA-14139 - Getting issue details... STATUS

coreDone

KIP-904: Kafka Streams - Guarantee subtractor is called before adder if key has not changed

KAFKA-12446 - Getting issue details... STATUS

StreamsDone (system test missing)
KIP-907: Add Boolean Serde to public interface

KAFKA-14722 - Getting issue details... STATUS

StreamsDone
KIP-911: Add source tag to Mirror source metric

KAFKA-14740 - Getting issue details... STATUS

connectDone
KIP-914: DSL Processor Semantics for Versioned Stores

KAFKA-14834 - Getting issue details... STATUS

StreamsDone

KIP-915: Txn and Group Coordinator Downgrade Foundation

KAFKA-14869 - Getting issue details... STATUS

coreDone


Postponed to subsequent release

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