Release Dates

Release Manager
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 target release date is fixed at ~2w after code freeze, RCs will roll out as needed until the release vote passes.

The release manager is Ismael Juma.

Release Features

This is a list of key features/improvements/bugfixes that we can include with release notes (WIP):

How to Contribute

Before code freeze:

After code freeze:

Open Issues

Planned KIP Content

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

1KIP-54: Sticky Partition Assignment StrategyConsumerJason Gustafson
2KIP-66: Single Message Transforms for Kafka Connect (items not included in Cheslack-Postava
3KIP-82 - Add Record HeadersMultipleJason Gustafson
4KIP-98 - Exactly Once Delivery and Transactional Messaging

MultipleGuozhang Wang, Jason Gustafson, Jun Rao, Ismael Juma
5KIP-101 - Alter Replication Protocol to use Leader Epoch rather than High Watermark for Truncation

ReplicationJun Rao

KIP-106 - Change Default unclean.leader.election.enabled from True to False

ControllerIsmael Juma
7KIP-107: Add purgeDataBefore() API in AdminClientMultipleJiangjie Qin
8KIP-109: Old Consumer DeprecationConsumerIsmael Juma
9KIP-114: KTable state stores and improved semanticsStreamsGuozhang Wang
10KIP-115: Enforce offsets.topic.replication.factor upon __consumer_offsets auto topic creationRequest handlingEwen Cheslack-Postava
11KIP-117: Add a public AdminClient API for Kafka admin operationsAdmin ClientIsmael Juma
12KIP-119: Drop Support for Scala 2.10 in Kafka 0.11BuildEwen Cheslack-Postava
13KIP-121: Add KStream peek methodStreamsGuozhang Wang
14KIP-122: Add Reset Consumer Group Offsets toolingToolsJason Gustafson
15KIP-123: Allow per stream/table timestamp extractorStreamsGuozhang Wang
16KIP-124 - Request rate quotasBrokerJun Rao
17KIP-126 - Allow KafkaProducer to split and resend oversized batches.ClientsJoel Jacob Koshy
18KIP-128: Add ByteArrayConverter for Kafka ConnectConnectEwen Cheslack-Postava
19KIP-129: Streams Exactly-Once Semantics

StreamsGuozhang Wang
20KIP-133: Describe and Alter Configs Admin APIsAdminClientJun Rao
21KIP-134: Delay initial consumer group rebalanceGroup CoordinatorGuozhang Wang
22KIP-136: Add Listener name to SelectorMetrics tagsMetricsIsmael Juma
23KIP-137: Enhance TopicCommand --describe to show topics marked for deletionToolsIsmael Juma
24KIP-140: Add administrative RPCs for adding, deleting, and listing ACLsAdminClientIsmael Juma
25KIP-143: Controller Health MetricsControllerJun Rao
26KIP-144: Exponential backoff for broker reconnect attemptsClientsIsmael Juma
27KIP-146 - Classloading Isolation in ConnectConnectEwen Cheslack-Postava
28KIP-151 Expose Connector type in REST APIConnectEwen Cheslack-Postava
29KIP-153: Include only client traffic in BytesOutPerSec metricMetricsIsmael Juma
30KIP-154 Add Kafka Connect configuration properties for creating internal topicsConnectEwen Cheslack-Postava
31KIP 155 - Add range scan for windowed state storesStreamsGuozhang Wang
32KIP 156 Add option "dry run" to Streams application reset toolStreamsGuozhang Wang

See Kafka Improvement Proposals for the full list of KIPs.

KIPs Bumped to Next Release

1KIP-48 Delegation token support for KafkaSecurity PR not available
2KIP-72: Allow putting a bound on memory consumed by Incoming request NetworkJun RaoIt was deemed safer to merge this to trunk early in the release cycle for the next release.
3KIP-81: Bound Fetch memory usage in the consumerConsumer Has a dependency on KIP-72 (which is still in progress) and there is no PR available, seems prudent to postpone it to the subsequent release.
4KIP-112: Handle disk failure for JBODBroker Needs more review time and makes sense to be part of the same release as KIP-113.
5KIP-118: Drop Support for Java 7Build Postponed for a variety of reasons
6KIP-120: Cleanup Kafka Streams builder APIStreamsGuozhang WangUnable to review it in time for the feature freeze
7KIP-138: Change punctuate semanticsStreamsGuozhang WangHigh impact change that needs more time to review