Release Dates

  • KIP Freeze: 26th July 23 (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: 16th Aug (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: 30th Aug 23
  • At least two weeks of stabilisation 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 Satish Duggana 

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.
    • Ensure that release candidates include artifacts for the new Connect test-plugins module (see KAFKA-15249 - Getting issue details... STATUS )

Open Issues

Key Summary T Created Updated Due Assignee Reporter P Status Resolution
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Also feel free to refer to the 3.6.0 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

Majority is completed.

Remaining to be done in 3.7.0

KIP-793: Allow sink connectors to be used with topic-mutating SMTs

KAFKA-13431 - Getting issue details... STATUS

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

KAFKA-13299 - Getting issue details... STATUS

coreCompleted
KIP-868 Metadata Transactions

KAFKA-14305 - Getting issue details... STATUS

core

Completed

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

KAFKA-4107 - Getting issue details... STATUS

connect

Completed

In prior releases: connector STOPPED state, offsets read API

In this release: Offsets alter and reset APIs

KIP-890: Transactions Server-Side Defense

KAFKA-14402 - Getting issue details... STATUS

core

Part 1 Completed

KIP-898: Modernize Connect plugin discovery

KAFKA-14627 - Getting issue details... STATUS

connect

Completed

KIP-902: Upgrade Zookeeper to 3.8.2

KAFKA-14661 - Getting issue details... STATUS

coreCompleted

KIP-917: Additional custom metadata for remote log segment

KAFKA-15107 - Getting issue details... STATUS

core

Completed

KIP-923: Add A Grace Period to Stream Table Join

KAFKA-14936 - Getting issue details... STATUS

streams

KIP Accepted

Implementation seems to be completed but yet to be confirmed by author.

KIP-925: Rack aware task assignment in Kafka Streams

KAFKA-15022 - Getting issue details... STATUS

streams

Partially implemented in 3.6

KIP-937: Improve Message Timestamp Validation

KAFKA-14991 - Getting issue details... STATUS

core

Completed

KIP-938: Add more metrics for measuring KRaft performance

KAFKA-15183 - Getting issue details... STATUS

core

KIP Accepted

Majority is completed. Remaining to be done in 3.7.0

KIP-863: Reduce CompletedFetch#parseRecord() memory copy

KAFKA-14944 - Getting issue details... STATUS

clients

Completed

KIP-930: Rename ambiguous Tiered Storage Metrics

KAFKA-15245 - Getting issue details... STATUS

core

Completed

KIP-941: Range queries to accept null lower and upper bounds

KAFKA-15126 - Getting issue details... STATUS

streams

Completed


Postponed to subsequent release

KIPJIRAComponentStatus
KIP-580: Exponential Backoff for Kafka Clients

KAFKA-9800 - Getting issue details... STATUS

clients

Implemented

Plan to release it in 3.7.0

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

KAFKA-12473 - Getting issue details... STATUS

clients

KIP Accepted

Implementation not yet completed

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

KAFKA-13152 - Getting issue details... STATUS

streams

KIP Accepted

Implementation in progress, not yet reviewed.

KIP-813: Shareable State Stores

KAFKA-10892 - Getting issue details... STATUS

streams

KIP Accepted

Implementation not yet completed.

KIP-821: Connect Transforms support for nested structures

KAFKA-13656 - Getting issue details... STATUS

connect

KIP Accepted

Implementation in progress

KIP-852: Optimize calculation of size for log in remote tier

KAFKA-14038 - Getting issue details... STATUS

core

KIP Accepted

Partially completed

KIP-919: Allow AdminClient to Talk Directly with the KRaft Controller Quorum and add Controller Registration

KAFKA-15230 - Getting issue details... STATUS

core

KIP Accepted

Not yet completed

KIP-925: Rack aware task assignment in Kafka Streams

KAFKA-15022 - Getting issue details... STATUS

streams

Partially implemented in 3.6

KIP-938: Add more metrics for measuring KRaft performance

KAFKA-15183 - Getting issue details... STATUS

core

KIP Accepted

Majority is completed. Remaining to be done in 3.7.0

KIP-872: Add Serializer#serializeToByteBuffer() to reduce memory copying

KAFKA-14945 - Getting issue details... STATUS

clients

KIP Accepted

Not yet completed

KIP-949: Add flag to enable the usage of topic separator in MM2 DefaultReplicationPolicy

KAFKA-15102 - Getting issue details... STATUS

mirrormaker

KIP Accepted

Not yet completed for 3.6.0.

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