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KIP (please keep this sorted by KIP number)

Release

1KIP-562: Allow fetching a key from a single partition rather than iterating over all the stores on an instance2.5.0 (WIP)
2KIP-559: Make the Kafka Protocol Friendlier with L7 Proxies2.5.0 (WIP)
3KIP-558: Track the set of actively used topics by connectors in Kafka Connect2.5.0 (WIP)
4KIP-553: Disable all SSL protocols except TLSV1.2 by default.2.5.0
5KIP-551: Expose disk read and write metrics2.5.0 (WIP)
56KIP-544: Make metrics exposed via JMX configurable2.5.0 (WIP)
67KIP-543: Expand ConfigCommand's non-ZK functionality2.5.0
78KIP-541: Create a fetch.max.bytes configuration for the broker2.5.0
89KIP-538: Add a metric tracking the number of open connections with a given SSL cipher type2.5.0
910KIP-537: Increase default zookeeper session timeout2.5.0
1011KIP-535: Allow state stores to serve stale reads during rebalanceWIP
1112KIP-534: Reorganize checkpoint system in log cleaner to per partition WIP
1213

KIP-532: Broker Consumer Lag metrics in size and time

WIP
1314KIP-531: Drop support for Scala 2.11 in Kafka 2.52.5.0 (WIP)
1415KIP-530: Consider renaming 'UsePreviousTimeOnInvalidTimeStamp' class to 'UsePartitionTimeOnInvalidTimeStamp'2.5.0 (WIP)
1516KIP-528: Deprecate PartitionGrouper configuration and interface2.4.0
1617KIP-527: Add VoidSerde to Serdes2.5.0
1718KIP-525 - Return topic metadata and configs in CreateTopics response2.4.0 
1819KIP-524: Allow users to choose config source when describing configs2.5.0 (WIP)
1920KIP-523: Add KStream#toTable to the Streams DSL2.5.0 (WIP)
2021KIP-521: Enable redirection of Connect's log4j messages to a file by default2.4.0
2122KIP-517: Add consumer metrics to observe user poll behavior2.4.0
2223KIP-511: Collect and Expose Client's Name and Version in the Brokers2.4.0 (protocol) / 2.5.0 (metric)
2324KIP-507: Securing Internal Connect REST Endpoints2.4.0
2425KIP-504 - Add new Java Authorizer Interface2.4.0 
2526KIP-503: Add metric for number of topics marked for deletion2.4.0 
2627KIP-501: Avoid out-of-sync or offline partitions when follower fetch requests not processed in timeWIP
2728KIP-500: Replace ZooKeeper with a Self-Managed Metadata Quorum
2829KIP-497: Add inter-broker API to alter ISR2.6.0 (WIP)
2930KIP-496: Administrative API to delete consumer offsets2.4.0 
3031KIP-495: Dynamically Adjust Log Levels in Connect2.4.0
3132KIP-492: Add java security providers in Kafka Security config2.4.0 
3233KIP-488: Clean up Sum,Count,Total Metrics2.4.0
3334KIP-484: Expose metrics for group and transaction metadata loading duration2.4.0 
3435KIP-482: The Kafka Protocol should Support Optional Tagged Fields2.4.0 
3536KIP-481: SerDe Improvements for Connect Decimal type in JSON2.4.0
3637KIP-480: Sticky Partitioner2.4.0
3738KIP-479: Add StreamJoined config object to Join2.4.0
3839KIP-478 - Strongly typed Processor APIWIP
3940KIP-476: Add Java AdminClient Interface2.4.0
4041KIP-475: New Metrics to Measure Number of Tasks on a Connector2.4.0
4142KIP-474: To deprecate WindowStore#put(key, value)2.4.0
4243KIP-471: Expose RocksDB Metrics in Kafka Streams

2.4.0 (partially implemented; completion blocked)

4344KIP-470: TopologyTestDriver test input and output usability improvements2.4.0 
4445KIP-467: Augment ProduceResponse error messaging for specific culprit records2.4.0 (partially implemented) / 2.5.0
4546KIP-466: Add support for List<T> serialization and deserialization2.4.0 (WIP)
4647KIP-465: Add Consolidated Connector Endpoint to Connect REST API2.3.0
4748KIP-464: Defaults for AdminClient#createTopic2.4.0
4849KIP-462: Use local thread id for KStreams2.3.0
4950KIP-461: Improve Replica Fetcher behavior at handling partition failure2.3.0
5051KIP-460: Admin Leader Election RPC2.4.0
5152KIP-458: Connector Client Config Override Policy2.3.0
5253KIP-455: Create an Administrative API for Replica Reassignment2.4.0 (API/broker logic)
2.5.0 (tools changes)
5354KIP-454: Expansion of the ConnectClusterState interface2.3.0
5455KIP-453: Add close() method to RocksDBConfigSetter2.3.0
5556KIP-449: Add connector contexts to log messages in Connect workers 2.3.0
5657KIP-447: Producer scalability for exactly once semantics2.5.0
5758KIP-445: In-memory Session Store2.3.0
5859KIP-444: Augment metrics for Kafka Streams2.4.0 (partially implemented) / 2.5.0 (WIP)
5960

KIP-443: Return to default segment.ms and segment.index.bytes in Streams repartition topics

2.3.0
6061KIP-442: Return to default max poll interval in Streams2.3.0
6162KIP-441: Smooth Scaling Out for Kafka Streams2.6.0 (WIP)
6263KIP-440: Extend Connect Converter to support headers2.4.0
6364KIP-436: Add a metric indicating start time2.3.0
6465KIP-434: Add Replica Fetcher and Log Cleaner Count Metrics2.4.0 (WIP)
6566KIP-430 - Return Authorized Operations in Describe Responses2.3.0
6667KIP-429: Kafka Consumer Incremental Rebalance Protocol2.4.0 (WIP)
6768KIP-428: Add in-memory window store2.3.0
6869KIP-427: Add AtMinIsr topic partition category (new metric & TopicCommand option)2.3.0
6970KIP-425: Add some Log4J Kafka Appender Properties for Producing to Secured Brokers2.3.0
7071KIP-421: Support resolving externalized secrets in AbstractConfig2.3.0
7172KIP-420: Add Single Value Fetch in Session Stores2.2.0
7273KIP-417: Allow JmxTool to connect to a secured RMI port2.3.0
7374KIP-415: Incremental Cooperative Rebalancing in Kafka Connect2.3.0
7475KIP-414: Expose Embedded ClientIds in Kafka Streams2.2.0
7576KIP-412: Extend Admin API to support dynamic application log levels2.4.0 
7677

KIP-411: Make default Kafka Connect worker task client IDs distinct

2.3.0
7778KIP-402: Improve fairness in SocketServer processors2.2.0 (partially implemented) / 2.3.0
7879KIP-401: TransformerSupplier/ProcessorSupplier StateStore connecting2.5.0 (WIP)
7980KIP-396: Add Commit/List Offsets Operations to AdminClient2.5.0 (WIP)
8081KIP-394: Require member.id for initial join group request2.2.0
8182KIP-393: Time windowed serde to properly deserialize changelog input topic2.2.0
8283KIP-392: Allow consumers to fetch from closest replica2.4.0
8384KIP-389: Introduce a configurable consumer group size limit2.2.0
8485KIP-386: Standardize on Min/Avg/Max metrics' default value2.2.0
8586KIP-382: MirrorMaker 2.02.4.0
8687

KIP-379: Multiple Consumer Group Management

2.4.0 
8788KIP-380: Detect outdated control requests and bounced brokers using broker generation2.2.0
8889KIP-377: TopicCommand to use AdminClient2.2.0
8990KIP-376: Implement AutoClosable on appropriate classes that want to be used in a try-with-resource statement2.2.0
9091KIP-374: Add '--help' option to all available Kafka CLI commands2.2.0
9192KIP-372: Naming Repartition Topics for Joins and Grouping2.1.0
9293KIP-371: Add a configuration to build custom SSL principal name2.2.0
9394KIP-369: Alternative Partitioner to Support "Always Round-Robin" Selection2.4.0
9495KIP 368: Allow SASL Connections to Periodically Re-Authenticate2.2.0
9596KIP-367 Introduce close(Duration) to Producer and AdminClient instead of close(long, TimeUnit)2.2.0
9697KIP-366: Make FunctionConversions deprecated2.1.0
9798KIP-365: Materialized, Serialized, Joined, Consumed and Produced with implicit Serde2.1.0
9899KIP-361: Add Consumer Configuration to Disable Auto Topic Creation2.3.0
99100KIP-360: Improve handling of unknown producer2.4.0 (partially implemented) / 2.5.0
100101KIP-359: Verify leader epoch in produce requests2.4.0 (WIP)
101102KIP-358: Migrate Streams API to Duration instead of long ms times2.1.0
102103KIP-357: Add support to list ACLs per principal2.1.0
103104KIP-356: Add withCachingDisabled() to StoreBuilder2.1.0
104105KIP-354: Add a Maximum Log Compaction Lag2.3.0
105106KIP-353: Improve Kafka Streams Timestamp Synchronization2.1.0
106107KIP-352: Distinguish URPs caused by reassignment2.5.0 
107108KIP-351: Add --under-min-isr option to describe topics command2.3.0
108109KIP-346: Improve LogCleaner behavior on error2.1.0
109110KIP-345: Introduce static membership protocol to reduce consumer rebalances2.4.0
110111KIP-342 Add support for custom SASL extensions in OAuthBearer authentication2.1.0
111112KIP-341: Update Sticky Assignor's User Data Protocol2.3.0
112113KIP-340: Allow kafka-reassign-partitions.sh and kafka-log-dirs.sh to take admin client property file2.1.0
113114KIP-339: Create a new IncrementalAlterConfigs API2.3.0 
114115KIP-338 Support to exclude the internal topics in kafka-topics.sh command2.1.0
115116KIP-336: Consolidate ExtendedSerializer/Serializer and ExtendedDeserializer/Deserializer2.1.0
116117KIP-332: Update AclCommand to use AdminClient API2.1.0
117118KIP-331 Add default implementation to close() and configure() for Serializer, Deserializer and Serde2.3.0
118119KIP-330: Add retentionPeriod in SessionBytesStoreSupplier2.1.0
119120KIP-328: Ability to suppress updates for KTables2.1.0 (partially implemented; inactive)
120121KIP-324: Add method to get metrics() in AdminClient2.1.0
121122KIP-322: Return new error code for DeleteTopics API when topic deletion disabled.2.1.0
122123KIP-321: Update TopologyDescription to better represent Source and Sink Nodes2.1.0
123124KIP-320: Allow fetchers to detect and handle log truncation2.1.0 (partially implemented) / 2.2.0
124125KIP-319: Replace segments with segmentInterval in WindowBytesStoreSupplier2.1.0
125126KIP-313: Add KStream.flatTransform and KStream.flatTransformValues 

2.2.0 (partially implemented)

/ 2.3.0

126127KIP-312 Add Overloaded StreamsBuilder Build Method to Accept java.util.Properties2.1.0
127128KIP-309: Add toUpperCase support to sasl.kerberos.principal.to.local rule2.4.0
128129KIP-308: Support dynamic update of max.connections.per.ip/max.connections.per.ip.overrides2.1.0
129130KIP-307: Allow to define custom processor names with KStreams DSL2.3.0 (partially implemented) / 2.4.0
130131KIP-306: Configuration for Delaying Response to Failed Authentication2.1.0
131132KIP-305: Add Connect primitive number converters2.0.0
132133KIP-303: Add Dynamic Routing in Streams Sink2.0.0
133134KIP-302 - Enable Kafka clients to use all DNS resolved IP addresses2.1.0
134135KIP-300: Add Windowed KTable API in StreamsBuilder3.0.0 (not implemented; inactive)
135136KIP-298: Error Handling in Connect2.0.0
136137KIP-297: Externalizing Secrets for Connect Configurations2.0.0
137138KIP-295 Add Streams Configuration Allowing for Optional Topology Optimization2.0.0
138139KIP-294 - Enable TLS hostname verification by default2.0.0
139140

KIP-291: Separating controller connections and requests from the data plane

Accepted
140141KIP-292: Add transformValues() method to KTable2.0.0
141142KIP-290: Support for Prefixed ACLs2.0.0
142143KIP-289: Improve the default group id behavior in KafkaConsumer2.2.0
143144KIP-285: Connect Rest Extension Plugin2.0.0
144145KIP-284: Set default retention ms for Streams repartition topics to Long.MAX_VALUE2.0.0
145146KIP-283: Efficient Memory Usage for Down-Conversion2.0.0
146147KIP-282: Add the listener name to the authentication context2.0.0
147148KIP-281: ConsumerPerformance: Increase Polling Loop Timeout and Make It Reachable by the End User2.0.0
148149KIP-280: Enhanced log compaction2.5.0 (WIP)
149150KIP-279: Fix log divergence between leader and follower after fast leader fail over2.0.0
150151KIP-278 - Add version option to Kafka's commands2.0.0
151152KIP-277 - Fine Grained ACL for CreateTopics API2.0.0
152153KIP-276 - Add StreamsConfig prefix for different consumers2.0.0
153154KIP-274: Kafka Streams Skipped Records Metrics2.0.0
154155KIP-272: Add API version tag to broker's RequestsPerSec metric2.0.0
155156KIP-270 - A Scala Wrapper Library for Kafka Streams2.0.0
156157KIP-268: Simplify Kafka Streams Rebalance Metadata Upgrade2.0.0
157158KIP-267: Add Processor Unit Test Support to Kafka Streams Test Utils2.0.0
158159KIP-266: Fix consumer indefinite blocking behavior2.0.0
159160KIP-265: Make Windowed Serde to public APIs2.0.0
160161KIP-261: Add Single Value Fetch in Window Stores2.0.0
161162KIP-258: Allow to Store Record Timestamps in RocksDB2.3.0 (partially implemented; inactive)
162163KIP-257 - Configurable Quota Management2.0.0
163164KIP-255: OAuth Authentication via SASL/OAUTHBEARER2.0.0
164165KIP-251: Allow timestamp manipulation in Processor API2.0.0
165166KIP-249: Add Delegation Token Operations to KafkaAdminClient2.0.0
166167KIP-247: Add public test utils for Kafka Streams1.1.0
167168KIP-245: Use Properties instead of StreamsConfig in KafkaStreams constructor2.0.0
168169KIP-244: Add Record Header support to Kafka Streams Processor API2.0.0
169170KIP-243: Make ProducerConfig and ConsumerConfig constructors public1.1.0
170171KIP-239 Add queryableStoreName() to GlobalKTable1.1.0
171172KIP-238: Expose Kafka cluster ID in Connect REST API1.1.0
172173KIP-237: More Controller Health Metrics2.0.0
173174KIP-235: Add DNS alias support for secured connection2.1.0
174175KIP-233: Simplify StreamsBuilder#addGlobalStore1.1.0
175176KIP-231: Improve the Required ACL of ListGroups API2.1.0
176177KIP-229: DeleteGroups API1.1.0
177178KIP-227 - Introduce Incremental FetchRequests to Increase Partition Scalability1.1.0
178179KIP-226 - Dynamic Broker Configuration1.1.0
179180KIP-225 - Use tags for consumer “records.lag” metrics1.1.0
180181KIP-224: Add configuration parameter `retries` to Streams API1.1.0
181182KIP-223 - Add per-topic min lead and per-partition lead metrics to KafkaConsumer2.0.0
182183KIP-222 - Add Consumer Group operations to Admin API2.0.0
183184KIP-221: Enhance DSL with Connecting Topic Creation and Repartition Hint2.4.0 (WIP)
184185KIP-220: Add AdminClient into Kafka Streams' ClientSupplier1.1.0
185186KIP-219 - Improve quota communication2.0.0
186187KIP-218: Make KafkaFuture.Function java 8 lambda compatible1.1.0
187188KIP-215: Add topic regex support for Connect sinks1.1.0
188189KIP-214: Add zookeeper.max.in.flight.requests config to the broker1.1.0
189190KIP-213 Support non-key joining in KTable2.4.0 (WIP)
190191KIP-212: Enforce set of legal characters for connector names1.1.0
191192KIP-211: Revise Expiration Semantics of Consumer Group Offsets2.1.0
192193KIP-210 - Provide for custom error handling when Kafka Streams fails to produce1.1.0
193194KIP-208: Add SSL support to Kafka Connect REST interface1.1.0
194195KIP-207: Offsets returned by ListOffsetsResponse should be monotonically increasing even during a partition leader change2.2.0
195196KIP-206: Add support for UUID serialization and deserialization2.1.0
196197KIP-205: Add all() and range() API to ReadOnlyWindowStore1.1.0
197198KIP-204 : Adding records deletion operation to the new Admin Client API1.1.0
198199KIP-203: Add toLowerCase support to sasl.kerberos.principal.to.local rule 1.1.0
199200KIP-202: Move merge() from StreamsBuilder to KStream1.0.0
200201KIP-198: Remove ZK dependency from Streams Reset Tool1.0.0
201202KIP-197 Connect REST API should include the connector type when describing a connector1.0.0
202203KIP-196: Add metrics to Kafka Connect framework1.0.0
203204KIP-195: AdminClient.createPartitions1.0.0
204205KIP-192 : Provide cleaner semantics when idempotence is enabled1.0.0
205206KIP-191: KafkaConsumer.subscribe() overload that takes just Pattern1.0.0
206207KIP-190: Handle client-ids consistently between clients and brokers1.0.0
207208KIP-189: Improve principal builder interface and add support for SASL1.0.0
208209KIP-188 - Add new metrics to support health checks1.0.0
209210KIP-187 - Add cumulative count metric for all Kafka rate metrics1.0.0
210211KIP-186: Increase offsets retention default to 7 days2.0.0
211212KIP-183 - Change PreferredReplicaLeaderElectionCommand to use AdminClient2.2.0
212213KIP-182: Reduce Streams DSL overloads and allow easier use of custom storage engines1.0.0
213214KIP-180: Add a broker metric specifying the number of consumer group rebalances in progress1.1.0
214215KIP-177: Consumer perf tool should count rebalance time1.0.0
215216KIP-176: Remove deprecated new-consumer option for tools2.0.0
216217KIP-175: Additional '--describe' views for ConsumerGroupCommand1.1.0
217218KIP-174 - Deprecate and remove internal converter configs in WorkerConfig2.0.0
218219KIP-173: Add prefix to StreamsConfig to enable setting default internal topic configs1.0.0
219220KIP-171 - Extend Consumer Group Reset Offset for Stream Application1.1.0
220221KIP-168: Add GlobalTopicCount and GlobalPartitionCount metric per cluster1.0.0
221222KIP-167: Add interface for the state store restoration process1.0.0
222223

KIP-164 - Add UnderMinIsrPartitionCount and per-partition UnderMinIsr metrics

1.0.0
223224

KIP-163: Lower the Minimum Required ACL Permission of OffsetFetch

1.0.0
224225KIP-162: Enable topic deletion by default1.0.0
225226KIP-161: streams deserialization exception handlers1.0.0
226227KIP-160: Augment KStream.print(), KStream.writeAsText() to allow users pass in extra parameters in the printed string1.0.0
227228KIP-158: Kafka Connect should allow source connectors to set topic-specific settings for new topics2.5.0 (WIP)
228229KIP-157 - Add consumer config options to streams reset tool1.0.0
229230KIP-156 Add option "dry run" to Streams application reset tool0.11.0.0
230231KIP-155 - Add range scan for windowed state stores0.11.0.0
231232KIP-154 Add Kafka Connect configuration properties for creating internal topics0.11.0.0
232233KIP-153: Include only client traffic in BytesOutPerSec metric0.11.0.0
233234KIP-152 - Improve diagnostics for SASL authentication failures1.0.0
234235KIP-151 Expose Connector type in REST API0.11.0.0
235236KIP-150 - Kafka-Streams Cogroup2.5.0 (WIP)
236237KIP-149: Enabling key access in ValueTransformer, ValueMapper, and ValueJoiner1.1.0 (partially implemented; inactive)
237238KIP-146 - Classloading Isolation in Connect

0.11.0.0

238239KIP-145 - Expose Record Headers in Kafka Connect1.1.0
239240KIP-144: Exponential backoff for broker reconnect attempts0.11.0.0
240241KIP-143: Controller Health Metrics0.11.0.0
241242KIP-140: Add administrative RPCs for adding, deleting, and listing ACLs0.11.0.0
242243KIP-138: Change punctuate semantics1.0.0
243244KIP-137: Enhance TopicCommand --describe to show topics marked for deletion0.11.0.0
244245KIP-136: Add Listener name to SelectorMetrics tags0.11.0.0
245246KIP-134: Delay initial consumer group rebalance0.11.0.0
246247KIP-133: Describe and Alter Configs Admin APIs0.11.0.0
247248KIP-130: Expose states of active tasks to KafkaStreams public API1.0.0
248249KIP-129: Streams Exactly-Once Semantics0.11.0.0
249250KIP-128: Add ByteArrayConverter for Kafka Connect0.11.0.0
250251KIP-126 - Allow KafkaProducer to split and resend oversized batches.0.11.0.0
251252KIP-124 - Request rate quotas0.11.0.0
252253KIP-123: Allow per stream/table timestamp extractor0.11.0.0
253254KIP-122: Add Reset Consumer Group Offsets tooling0.11.0.0
254255KIP-121: Add KStream peek method

0.11.0.0

255256KIP-120: Cleanup Kafka Streams builder API1.0.0
256257KIP-119: Drop Support for Scala 2.10 in Kafka 0.110.11.0.0
257258KIP-118: Drop Support for Java 72.0.0
258259KIP-117: Add a public AdminClient API for Kafka admin operations0.11.0.0
259260KIP-115: Enforce offsets.topic.replication.factor upon __consumer_offsets auto topic creation0.11.0.0
260261KIP-114: KTable state stores and improved semantics0.11.0.0
261262KIP-113: Support replicas movement between log directories1.1.0
262263KIP-112: Handle disk failure for JBOD1.0.0
263264KIP-110: Add Codec for ZStandard Compression2.1.0
264265KIP-109: Old Consumer Deprecation0.11.0.0
265266KIP-108: Create Topic Policy0.10.2.0
266267KIP-107: Add deleteRecordsBefore() API in AdminClient0.11.0.0
267268

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

0.11.0.0
268269KIP-105: Addition of Record Level for Sensors0.10.2.0
269270KIP-104: Granular Sensors for Streams 0.10.2.0
270271KIP-103: Separation of Internal and External traffic0.10.2.0
271272KIP-102 - Add close with timeout for consumers0.10.2.0
272273KIP-101 - Alter Replication Protocol to use Leader Epoch rather than High Watermark for Truncation0.11.0.0
273274KIP-100 - Relax Type constraints in Kafka Streams API0.10.2.0
274275KIP-99: Add Global Tables to Kafka Streams0.10.2.0
275276KIP-98 - Exactly Once Delivery and Transactional Messaging0.11.0.0
276277KIP-97: Improved Kafka Client RPC Compatibility Policy0.10.2.0
277278KIP-96 - Add per partition metrics for in-sync and assigned replica count0.10.2.0
278279KIP-94 Session Windows0.10.2.0
279280KIP-93: Improve invalid timestamp handling in Kafka Streams0.10.2.0
280281KIP-92 - Add per partition lag metrics to KafkaConsumer0.10.2.0
281282KIP-91 Provide Intuitive User Timeouts in The Producer2.1.0
282283KIP-90 - Remove zkClient dependency from Streams0.10.2.0
283284KIP-89: Allow sink connectors to decouple flush and offset commit0.10.2.0
284285KIP-88: OffsetFetch Protocol Update0.10.2.0
285286KIP-86: Configurable SASL callback handlers2.0.0
286287KIP-85: Dynamic JAAS configuration for Kafka clients0.10.2.0
287288KIP-84: Support SASL SCRAM mechanisms0.10.2.0
288289KIP-82 - Add Record Headers0.11.0.0
289290KIP-81: Bound Fetch memory usage in the consumer2.6.0 (WIP)
290291KIP-79 - ListOffsetRequest/ListOffsetResponse v1 and add timestamp search methods to the new consumer0.10.1.0
291292KIP-78: Cluster Id0.10.1.0
292293KIP-77: Improve Kafka Streams Join Semantics0.10.2.0
293294KIP-75 - Add per-connector Converters0.10.1.0
294295KIP-74: Add Fetch Response Size Limit in Bytes0.10.1.0
295296KIP-73: Replication Quotas0.10.1.0
296297KIP-72: Allow putting a bound on memory consumed by Incoming request 1.0.0
297298KIP-71: Enable log compaction and deletion to co-exist0.10.1.0
298299KIP-70: Revise Partition Assignment Semantics on New Consumer's Subscription Change0.10.1.0
299300KIP-67: Queryable state for Kafka Streams0.10.1.0
300301KIP-66: Single Message Transforms for Kafka Connect0.10.2.0 / 0.11.0.0
301302KIP-65: Expose timestamps to Connect0.10.1.0
302303KIP-63: Unify store and downstream caching in streams0.10.1.0
303304KIP-62: Allow consumer to send heartbeats from a background thread0.10.1.0
304305KIP-60 - Make Java client classloading more flexible0.10.1.0
305306KIP-58 - Make Log Compaction Point Configurable0.10.1.0
306307KIP-57 - Interoperable LZ4 Framing0.10.0.0
307308KIP-56: Allow cross origin HTTP requests on all HTTP methods0.10.0.0
308309KIP-55: Secure Quotas for Authenticated Users0.10.1.0
309310KIP-54: Sticky Partition Assignment Strategy0.11.0.0
310311KIP-52: Connector Control APIs0.10.0.0
311312KIP-51 - List Connectors REST API0.10.0.0
312313KIP-48 Delegation token support for Kafka1.1.0
313314KIP-45 - Standardize all client sequence interaction on j.u.Collection.0.10.0.0
314315KIP-43: Kafka SASL enhancements0.10.0.0
315316KIP-42: Add Producer and Consumer Interceptors0.10.0.0
316317KIP-41: Consumer Max Records0.10.0.0
317318KIP-40: ListGroups and DescribeGroup0.9.0.0
318319KIP-38: ZooKeeper Authentication0.9.0.0
319320KIP-36 - Rack aware replica assignment0.10.0.0
320321KIP-35 - Retrieving protocol version0.10.0.0
321322KIP-33 - Add a time based log index0.10.1.0
322323KIP-32 - Add timestamps to Kafka message0.10.0.0
323324KIP-31 - Move to relative offsets in compressed message sets0.10.0.0
324325KIP-28 - Add a processor client0.10.0.0
325326KIP-26 - Add Kafka Connect framework for data import/export0.9.0.0
326327KIP-25 - System test improvements0.9.0.0
327328KIP-22 - Expose a Partitioner interface in the new producer0.9.0.0
328329KIP-21 - Dynamic Configuration0.9.0.0 (WIP)
329330KIP-20 Enable log preallocate to improve consume performance under windows and some old Linux file system0.9.0.0
330331KIP-19 - Add a request timeout to NetworkClient0.9.0.0
331332KIP-16 - Automated Replica Lag Tuning0.9.0.0
332333KIP-15 - Add a close method with a timeout in the producer0.9.0.0
333334KIP-13 - Quota Design0.9.0.0
334335KIP-12 - Kafka Sasl/Kerberos and SSL implementation0.9.0.0
335336KIP-11 - Kafka Authorizer design0.9.0.0
336337KIP-8 - Add a flush method to the producer API0.9.0.0
337338KIP-4 - Metadata Protocol Changes0.10.0.0
338339KIP-4 - Command line and centralized administrative operations0.9.0.0, 0.10.0.0, 0.10.1.0
339340KIP-3 - Mirror Maker Enhancement0.9.0.0
340341KIP-2 - Refactor brokers to allow listening on multiple ports and IPs0.9.0.0
341342KIP-1 - Remove support of request.required.acks0.9.0.0

...

KIPComment
KIP-59: Proposal for a kafka broker commandSent emails to Dev discussion group. Work tracked under KAFKA-3663.
KIP-125: ZookeeperConsumerConnector to KafkaConsumer Migration and Rollback
KIP-131 - Add access to OffsetStorageReader from SourceConnector
KIP-135 : Send of null key to a compacted topic should throw non-retriable error back to user
KIP 141 - ProducerRecord & SourceRecord: Add timestamp constructors
KIP-142: Add ListTopicsRequest to efficiently list all the topics in a cluster
KIP-148: Add a connect timeout for client
KIP-166 - Add a tool to make amounts of replicas and leaders on brokers balanced
KIP-169 - Lag-Aware Partition Assignment Strategy
KIP-178: Size-based log directory selection strategy


KIP-185: Make exactly once in order delivery the default producer setting


KIP-193: Add SchemaBuilder.from(Schema)
KIP-199: Add Kafka Connect offset tool
KIP-201: Rationalising Policy interfaces
KIP-209: Connection String Support
KIP-216: IQ should throw different exceptions for different errors
KIP-217: Expose a timeout to allow an expired ZK session to be re-created
KIP-228 Negative record timestamp supportVoting in progress
KIP-234: add support for getting topic defaults from AdminClient
KIP-236: Interruptible Partition Reassignment Discussion
KIP-240: AdminClient.listReassignments() AdminClient.describeReassignments()
KIP-242: Mask password in Kafka Connect Rest API response
KIP-250 Add Support for Quorum-based Producer Acknowledgment
KIP-252 - Extend ACLs to allow filtering based on ip ranges and subnets
KIP-253: Support in-order message delivery with partition expansion Discussion
KIP-254: JsonConverter Exception Handeling
KIP-264: Add a consumer metric to record raw fetch sizeVoting in progress
KIP-271: Add NetworkClient redirectorDiscussion
KIP-273: Kafka to support using ETCD beside ZookeeperDiscussion
KIP-275 - Indicate "isClosing" in the SinkTaskContextVoting in progress
KIP-293 Add new metrics for consumer/replication fetch requestsVoting in progress
KIP-296: Add connector level configurability for producer/consumer client configs Discussion
KIP-301: Schema Inferencing for JsonConverterDiscussion
KIP-304: Connect runtime mode improvements for container platformsDiscussion
KIP-315: Stream Join Sticky AssignorDiscussion
KIP-316: Command-line overrides for ConnectDistributed worker propertiesDiscussion
KIP-317: Add end-to-end data encryption functionality to Apache KafkaDiscussion
KIP-325: Extend Consumer Group Command to Show Beginning OffsetsVoting in Progress345
KIP-333: Add faster mode of rebalancingDiscussion
KIP-334 - Include partitions in exceptions raised during consumer record deserialization/validation
KIP-347: Enable batching in FindCoordinatorRequestDiscussion
KIP-348 Eliminate null from SourceTask#poll()
KIP-350: Allow kafka-topics.sh to take brokerid as parameter to show partitions associated with it
KIP-356: Add KafkaConsumer fetch-error-rate and fetch-error-total metricsDiscussion
KIP-363: Allow performance tools to print final results to output fileDiscussion
KIP-370: Remove Orphan PartitionsDiscussion
KIP-373: Allow users to create delegation tokens for other usersDiscussion
KIP-375: Kafka Clients - make Metadata#TOPIC_EXPIRY_MS configurableDiscussion
KIP-381: Connect: Tell about records that had their offsets flushed in callback

Voting in progress (restarted 18th January 2019, due to no votes in first attempt)

KIP-383:  Pluggable interface for SSL FactoryVoting in progress
KIP-384: Add config for incompatible changes to persistent metadataDiscussion
KIP-385: Avoid throwing away prefetched dataDiscussion
KIP-387: Fair Message Consumption Across Partitions in KafkaConsumer

Discussion

KIP-388: Add observer interface to record request and responseDiscussion
KIP-390: Allow fine-grained configuration for compressionDiscussion, JIRA exists with pull-request
KIP-395: Encypt-then-MAC Delegation token metadata
KIP-397: Add methods to override fetch offsets based on timestampDiscussion
KIP-399: Extend ProductionExceptionHandler to cover serialization exceptionsDiscussion
KIP-400: Improve exit status in case of errors in ConsoleProducerDiscussion
KIP-403: Increase ProducerPerformance precision by using nanoTimeDraft
KIP-405: Kafka Tiered Storage

Discussion

KIP-407: Kafka Connect support override worker kafka api configuration with connector configuration that post by rest api

KIP-409: Allow creating under-replicated topics and partitions


KIP-410: Add metric for request handler thread pool utilization by request type

Discussion
KIP-416: Notify SourceTask of ACK'd offsets, metadataDiscussion
KIP-419: Safely notify Kafka Connect SourceTask is stoppedVoting in progress, JIRA exists with pull request
KIP-422: Add support for client quota configuration in the Kafka Admin ClientDiscussion, JIRA exists with pull-request
KIP-423: Add JoinReason to Consumer Join Group Protocol

Discussion

KIP-424: Allow suppression of intermediate events based on wall clock timeDiscussion
KIP-426: Persist Broker Id to ZookeeperDiscussion
KIP-431: Support of printing additional ConsumerRecord fields in DefaultMessageFormatterVoting in progress, JIRA exists with pull-request
KIP-435: Internal Partition Reassignment BatchingDiscussion
KIP-437: Custom replacement for MaskField SMTVoting in progress, JIRA exists with pull-request
KIP-438: Expose task, connector IDs in Connect APIDiscussion
KIP-439: Cleanup built-in Store interfacesDiscussion
KIP-448: Add State Stores Unit Test Support to Kafka Streams Test UtilsDiscussion
KIP-452: Tool to view cluster statusDiscussion, JIRA exists
KIP-468: Avoid decompression of record when validate record at server in the scene of inPlaceAssignment .Under discussion
KIP-473: Enable KafkaLog4JAppender to use SASL Authentication Callback HandlersUnder Discussion 
KIP-477: Add PATCH method for connector config in Connect REST APIUnder Discussion
KIP-486: Support custom way to load KeyStore and TrustStoreUnder Discussion
KIP-487: Automatic Topic Creation on ProducerUnder Discussion
KIP-489: Kafka Consumer Record Latency MetricUnder Discussion
KIP-490: New metric to count offsets expired without being consumed by a consumer groupUnder discussion
KIP-491: Preferred Leader Deprioritized List (Temporary Blacklist)Under discussion
KIP-494: Connect REST Endpoint to get Transformations (SMTs)
KIP-498: Add client-side configuration for maximum response size to protect against OOMSent emails to Dev discussion group. Work tracked under KAFKA-4090.

KIP-499 - Unify connection name flag for command line tool

Under discussion
KIP-502: Connect SinkTask.put(...) to specify ArrayList<SinkRecord> in Signature
KIP-505: Add new public method to only update assignment metadata in consumerUnder discussion
KIP-506: Allow setting SCRAM password via Admin interfaceUnder discussion
KIP-509: Rebalance and restart ProducersUnder discussion
KIP-510: Metrics library upgradeUnder discussion
KIP-512: Adding headers to RecordMetaDataSent mail to dev discussion group
KIP-513: Distinguish between Key and Value serdes in scala wrapper library for kafka streamsSent mail to dev discussion group

KIP-514:Add a bounded flush() API to Kafka Producer


KIP-515: Enable ZK client to use the new TLS supported authenticationUnder discussion
KIP-516: Topic Identifiers & Topic Deletion State ImprovementsUnder discussion
KIP-518: Allow listing consumer groups per stateUnder discussion
KIP-519: Make SSL context/engine configuration extensibleVoting
KIP-526: Reduce Producer Metadata Lookups for Large Number of TopicsUnder discussion
KIP-533: Add default api timeout to AdminClient

Under Discussion

KIP-536: Propagate broker start time to Admin APIUnder discussion
KIP-539: Add mechanism to flush records out in low volume suppression buffersUnder discussion.
KIP-540: Implement per key stream time trackingDraft (In Progress)
KIP-542: Partition Reassignment ThrottlingDraft
KIP-545: support automated consumer offset sync across clusters in MM 2.0Voting in progress
KIP-546: Add quota-specific APIs to the Admin Client, reduxUnder discussion
KIP-547: Extend ConsumerInterceptor to allow modification of Consumer CommitsUnder Discussion
KIP-548 Add Option to enforce rack-aware custom partition reassignment executionUnder Discussion
KIP-549: Surface Consumer's Metadata in KafkaAdminClient#describeConsumerGroupsUnder Discussion
KIP-550: Mechanism to Delete Stray Partitions on BrokerDraft
KIP-552: Add interface to handle unused configUnder DiscussionKIP-553: Disable all SSL protocols except TLSV1.2 by default.Under Discussion
KIP-555: Deprecate direct Zookeeper access in Kafka administrative toolsUnder Discussion

KIP-561: Regex Support for ConsumerGroupCommand

Under Discussion
KIP-563: Add 'tail -n' feature for ConsoleConsumerUnder Discussion
KIP-564: Add new cached authorizer:change the dim of cacheUnder Discussion
KIP-565: Using AclCommand,avoid call the global method loadcache in SimpleAclAuthorizerUnder Discussion
KIP-566: Add rebalance callbacks to ConsumerInterceptorUnder Discussion
KIP-567: Kafka Cluster AuditUnder Discussion

...