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KIP (please keep this sorted by KIP number)

Release

1KIP-574: CLI Dynamic Configuration with file input2.6.0 (WIP)
2KIP-580: Exponential Backoff for Kafka Clients2.6.0 (WIP)
3KIP-579: new exception on min.insync.replicas > replication.factor2.6.0 (WIP)4KIP-557: Add emit on change support for Kafka Streams2.6.0 (WIP)
54

KIP-570: Add leader epoch in StopReplicaRequest

2.6.0 (WIP)
65KIP-569: DescribeConfigsResponse - Update the schema to include additional metadata information of the field2.6.0 (WIP)
76KIP-568: Explicit rebalance triggering on the Consumer2.6.0 (WIP)
87KIP-562: Allow fetching a key from a single partition rather than iterating over all the stores on an instance2.5.0 (WIP)
98KIP-559: Make the Kafka Protocol Friendlier with L7 Proxies2.5.0
109KIP-558: Track the set of actively used topics by connectors in Kafka Connect2.5.0
1110KIP-555: Deprecate direct Zookeeper access in Kafka administrative tools2.5.0
1211KIP-553: Disable all SSL protocols except TLSV1.2 by default.2.5.0
1312KIP-551: Expose disk read and write metrics2.5.0 (WIP)
1413KIP-546: Add quota-specific APIs to the Admin Client, redux2.6.0 (WIP)
1514KIP-544: Make metrics exposed via JMX configurable2.5.0
1615KIP-543: Expand ConfigCommand's non-ZK functionality2.5.0
1716KIP-541: Create a fetch.max.bytes configuration for the broker2.5.0
1817KIP-538: Add a metric tracking the number of open connections with a given SSL cipher type2.5.0
1918KIP-537: Increase default zookeeper session timeout2.5.0
2019KIP-535: Allow state stores to serve stale reads during rebalance2.5.0
2120KIP-534: Reorganize checkpoint system in log cleaner to per partition WIP
2221KIP-533: Add default api timeout to AdminClient2.5.0
2322

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

WIP
2423KIP-531: Drop support for Scala 2.11 in Kafka 2.52.5.0 (WIP)
2524KIP-530: Consider renaming 'UsePreviousTimeOnInvalidTimeStamp' class to 'UsePartitionTimeOnInvalidTimeStamp'2.5.0 (WIP)
2625KIP-528: Deprecate PartitionGrouper configuration and interface2.4.0
2726KIP-527: Add VoidSerde to Serdes2.5.0
2827KIP-526: Reduce Producer Metadata Lookups for Large Number of Topics2.5.0
2928KIP-525 - Return topic metadata and configs in CreateTopics response2.4.0 
3029KIP-524: Allow users to choose config source when describing configs2.5.0 (WIP)
3130KIP-523: Add KStream#toTable to the Streams DSL2.5.0 (WIP)
3231KIP-521: Enable redirection of Connect's log4j messages to a file by default2.4.0
3332KIP-519: Make SSL context/engine configuration extensibleAccepted
3433KIP-518: Allow listing consumer groups per state2.6.0 (WIP)
3534KIP-517: Add consumer metrics to observe user poll behavior2.4.0
3635KIP-515: Enable ZK client to use the new TLS supported authentication2.5.0
3736KIP-514:Add a bounded flush() API to Kafka Producer2.5.0
3837KIP-511: Collect and Expose Client's Name and Version in the Brokers2.4.0 (protocol) / 2.5.0 (metric)
3938KIP-507: Securing Internal Connect REST Endpoints2.4.0
4039KIP-504 - Add new Java Authorizer Interface2.4.0 
4140KIP-503: Add metric for number of topics marked for deletion2.4.0 
4241KIP-501: Avoid out-of-sync or offline partitions when follower fetch requests not processed in timeWIP
4342KIP-500: Replace ZooKeeper with a Self-Managed Metadata Quorum
4443KIP-497: Add inter-broker API to alter ISR2.6.0 (WIP)
4544KIP-496: Administrative API to delete consumer offsets2.4.0 
4645KIP-495: Dynamically Adjust Log Levels in Connect2.4.0
4746KIP-492: Add java security providers in Kafka Security config2.4.0 
4847KIP-488: Clean up Sum,Count,Total Metrics2.4.0
4948KIP-484: Expose metrics for group and transaction metadata loading duration2.4.0 
5049KIP-482: The Kafka Protocol should Support Optional Tagged Fields2.4.0 
5150KIP-481: SerDe Improvements for Connect Decimal type in JSON2.4.0
5251KIP-480: Sticky Partitioner2.4.0
5352KIP-479: Add StreamJoined config object to Join2.4.0
5453KIP-478 - Strongly typed Processor APIWIP
5554KIP-476: Add Java AdminClient Interface2.4.0
5655KIP-475: New Metrics to Measure Number of Tasks on a Connector2.4.0
5756KIP-474: To deprecate WindowStore#put(key, value)2.4.0
5857KIP-471: Expose RocksDB Metrics in Kafka Streams

2.4.0 (partially implemented; completion blocked)

5958KIP-470: TopologyTestDriver test input and output usability improvements2.4.0 
6059KIP-467: Augment ProduceResponse error messaging for specific culprit records2.4.0 (partially implemented) / 2.5.0
6160KIP-466: Add support for List<T> serialization and deserialization2.4.0 (WIP)
6261KIP-465: Add Consolidated Connector Endpoint to Connect REST API2.3.0
6362KIP-464: Defaults for AdminClient#createTopic2.4.0
6463KIP-462: Use local thread id for KStreams2.3.0
6564KIP-461: Improve Replica Fetcher behavior at handling partition failure2.3.0
6665KIP-460: Admin Leader Election RPC2.4.0
6766KIP-458: Connector Client Config Override Policy2.3.0
6867KIP-455: Create an Administrative API for Replica Reassignment2.4.0 (API/broker logic)
2.5.0 (tools changes)
6968KIP-454: Expansion of the ConnectClusterState interface2.3.0
7069KIP-453: Add close() method to RocksDBConfigSetter2.3.0
7170KIP-449: Add connector contexts to log messages in Connect workers 2.3.0
7271KIP-447: Producer scalability for exactly once semantics2.5.0  (partially implemented) / 2.6.0 (WIP)
7372KIP-446: Add changelog topic configuration to KTable suppress2.6.0
7473KIP-445: In-memory Session Store2.3.0
7574KIP-444: Augment metrics for Kafka Streams2.4.0 (partially implemented) / 2.5.0 (WIP)
7675

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

2.3.0
7776KIP-442: Return to default max poll interval in Streams2.3.0
7877KIP-441: Smooth Scaling Out for Kafka Streams2.6.0 (WIP)
7978KIP-440: Extend Connect Converter to support headers2.4.0
8079KIP-436: Add a metric indicating start time2.3.0
8180KIP-434: Add Replica Fetcher and Log Cleaner Count Metrics2.4.0 (WIP)
8281KIP-430 - Return Authorized Operations in Describe Responses2.3.0
8382KIP-429: Kafka Consumer Incremental Rebalance Protocol2.4.0 (WIP)
8483KIP-428: Add in-memory window store2.3.0
8584KIP-427: Add AtMinIsr topic partition category (new metric & TopicCommand option)2.3.0
8685KIP-425: Add some Log4J Kafka Appender Properties for Producing to Secured Brokers2.3.0
8786KIP-421: Support resolving externalized secrets in AbstractConfig2.3.0
8887KIP-420: Add Single Value Fetch in Session Stores2.2.0
8988KIP-417: Allow JmxTool to connect to a secured RMI port2.3.0
9089KIP-415: Incremental Cooperative Rebalancing in Kafka Connect2.3.0
9190KIP-414: Expose Embedded ClientIds in Kafka Streams2.2.0
9291KIP-412: Extend Admin API to support dynamic application log levels2.4.0 
9392

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

2.3.0
9493KIP-402: Improve fairness in SocketServer processors2.2.0 (partially implemented) / 2.3.0
9594KIP-401: TransformerSupplier/ProcessorSupplier StateStore connecting2.5.0 (WIP)
9695KIP-399: Extend ProductionExceptionHandler to cover serialization exceptions2.5.0
9796KIP-396: Add Commit/List Offsets Operations to AdminClient2.5.0 (WIP)
9897KIP-394: Require member.id for initial join group request2.2.0
9998KIP-393: Time windowed serde to properly deserialize changelog input topic2.2.0
10099KIP-392: Allow consumers to fetch from closest replica2.4.0
101100KIP-389: Introduce a configurable consumer group size limit2.2.0
102101KIP-386: Standardize on Min/Avg/Max metrics' default value2.2.0
103102KIP-382: MirrorMaker 2.02.4.0
104103

KIP-379: Multiple Consumer Group Management

2.4.0 
105104KIP-380: Detect outdated control requests and bounced brokers using broker generation2.2.0
106105KIP-377: TopicCommand to use AdminClient2.2.0
107106KIP-376: Implement AutoClosable on appropriate classes that want to be used in a try-with-resource statement2.2.0
108107KIP-374: Add '--help' option to all available Kafka CLI commands2.2.0
109108KIP-372: Naming Repartition Topics for Joins and Grouping2.1.0
110109KIP-371: Add a configuration to build custom SSL principal name2.2.0
111110KIP-369: Alternative Partitioner to Support "Always Round-Robin" Selection2.4.0
112111KIP 368: Allow SASL Connections to Periodically Re-Authenticate2.2.0
113112KIP-367 Introduce close(Duration) to Producer and AdminClient instead of close(long, TimeUnit)2.2.0
114113KIP-366: Make FunctionConversions deprecated2.1.0
115114KIP-365: Materialized, Serialized, Joined, Consumed and Produced with implicit Serde2.1.0
116115KIP-361: Add Consumer Configuration to Disable Auto Topic Creation2.3.0
117116KIP-360: Improve reliability of idempotent/transactional producer2.4.0 (partially implemented) / 2.5.0
118117KIP-359: Verify leader epoch in produce requests2.4.0 (WIP)
119118KIP-358: Migrate Streams API to Duration instead of long ms times2.1.0
120119KIP-357: Add support to list ACLs per principal2.1.0
121120KIP-356: Add withCachingDisabled() to StoreBuilder2.1.0
122121KIP-354: Add a Maximum Log Compaction Lag2.3.0
123122KIP-353: Improve Kafka Streams Timestamp Synchronization2.1.0
124123KIP-352: Distinguish URPs caused by reassignment2.5.0 
125124KIP-351: Add --under-min-isr option to describe topics command2.3.0
126125KIP-346: Improve LogCleaner behavior on error2.1.0
127126KIP-345: Introduce static membership protocol to reduce consumer rebalances2.4.0
128127KIP-342 Add support for custom SASL extensions in OAuthBearer authentication2.1.0
129128KIP-341: Update Sticky Assignor's User Data Protocol2.3.0
130129KIP-340: Allow kafka-reassign-partitions.sh and kafka-log-dirs.sh to take admin client property file2.1.0
131130KIP-339: Create a new IncrementalAlterConfigs API2.3.0 
132131KIP-338 Support to exclude the internal topics in kafka-topics.sh command2.1.0
133132KIP-336: Consolidate ExtendedSerializer/Serializer and ExtendedDeserializer/Deserializer2.1.0
134133KIP-332: Update AclCommand to use AdminClient API2.1.0
135134KIP-331 Add default implementation to close() and configure() for Serializer, Deserializer and Serde2.3.0
136135KIP-330: Add retentionPeriod in SessionBytesStoreSupplier2.1.0
137136KIP-328: Ability to suppress updates for KTables2.1.0 (partially implemented; inactive)
138137KIP-324: Add method to get metrics() in AdminClient2.1.0
139138KIP-322: Return new error code for DeleteTopics API when topic deletion disabled.2.1.0
140139KIP-321: Update TopologyDescription to better represent Source and Sink Nodes2.1.0
141140KIP-320: Allow fetchers to detect and handle log truncation2.1.0 (partially implemented) / 2.2.0
142141KIP-319: Replace segments with segmentInterval in WindowBytesStoreSupplier2.1.0
143142KIP-313: Add KStream.flatTransform and KStream.flatTransformValues 

2.2.0 (partially implemented)

/ 2.3.0

144143KIP-312 Add Overloaded StreamsBuilder Build Method to Accept java.util.Properties2.1.0
145144KIP-309: Add toUpperCase support to sasl.kerberos.principal.to.local rule2.4.0
146145KIP-308: Support dynamic update of max.connections.per.ip/max.connections.per.ip.overrides2.1.0
147146KIP-307: Allow to define custom processor names with KStreams DSL2.3.0 (partially implemented) / 2.4.0
148147KIP-306: Configuration for Delaying Response to Failed Authentication2.1.0
149148KIP-305: Add Connect primitive number converters2.0.0
150149KIP-303: Add Dynamic Routing in Streams Sink2.0.0
151150KIP-302 - Enable Kafka clients to use all DNS resolved IP addresses2.1.0
152151KIP-300: Add Windowed KTable API in StreamsBuilder3.0.0 (not implemented; inactive)
153152KIP-298: Error Handling in Connect2.0.0
154153KIP-297: Externalizing Secrets for Connect Configurations2.0.0
155154KIP-295 Add Streams Configuration Allowing for Optional Topology Optimization2.0.0
156155KIP-294 - Enable TLS hostname verification by default2.0.0
157156

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

Accepted
158157KIP-292: Add transformValues() method to KTable2.0.0
159158KIP-290: Support for Prefixed ACLs2.0.0
160159KIP-289: Improve the default group id behavior in KafkaConsumer2.2.0
161160KIP-285: Connect Rest Extension Plugin2.0.0
162161KIP-284: Set default retention ms for Streams repartition topics to Long.MAX_VALUE2.0.0
163162KIP-283: Efficient Memory Usage for Down-Conversion2.0.0
164163KIP-282: Add the listener name to the authentication context2.0.0
165164KIP-281: ConsumerPerformance: Increase Polling Loop Timeout and Make It Reachable by the End User2.0.0
166165KIP-280: Enhanced log compaction2.5.0 (WIP)
167166KIP-279: Fix log divergence between leader and follower after fast leader fail over2.0.0
168167KIP-278 - Add version option to Kafka's commands2.0.0
169168KIP-277 - Fine Grained ACL for CreateTopics API2.0.0
170169KIP-276 - Add StreamsConfig prefix for different consumers2.0.0
171170KIP-274: Kafka Streams Skipped Records Metrics2.0.0
172171KIP-272: Add API version tag to broker's RequestsPerSec metric2.0.0
173172KIP-270 - A Scala Wrapper Library for Kafka Streams2.0.0
174173KIP-268: Simplify Kafka Streams Rebalance Metadata Upgrade2.0.0
175174KIP-267: Add Processor Unit Test Support to Kafka Streams Test Utils2.0.0
176175KIP-266: Fix consumer indefinite blocking behavior2.0.0
177176KIP-265: Make Windowed Serde to public APIs2.0.0
178177KIP-261: Add Single Value Fetch in Window Stores2.0.0
179178KIP-258: Allow to Store Record Timestamps in RocksDB2.3.0 (partially implemented; inactive)
180179KIP-257 - Configurable Quota Management2.0.0
181180KIP-255: OAuth Authentication via SASL/OAUTHBEARER2.0.0
182181KIP-251: Allow timestamp manipulation in Processor API2.0.0
183182KIP-249: Add Delegation Token Operations to KafkaAdminClient2.0.0
184183KIP-247: Add public test utils for Kafka Streams1.1.0
185184KIP-245: Use Properties instead of StreamsConfig in KafkaStreams constructor2.0.0
186185KIP-244: Add Record Header support to Kafka Streams Processor API2.0.0
187186KIP-243: Make ProducerConfig and ConsumerConfig constructors public1.1.0
188187KIP-239 Add queryableStoreName() to GlobalKTable1.1.0
189188KIP-238: Expose Kafka cluster ID in Connect REST API1.1.0
190189KIP-237: More Controller Health Metrics2.0.0
191190KIP-235: Add DNS alias support for secured connection2.1.0
192191KIP-233: Simplify StreamsBuilder#addGlobalStore1.1.0
193192KIP-231: Improve the Required ACL of ListGroups API2.1.0
194193KIP-229: DeleteGroups API1.1.0
195194KIP-227 - Introduce Incremental FetchRequests to Increase Partition Scalability1.1.0
196195KIP-226 - Dynamic Broker Configuration1.1.0
197196KIP-225 - Use tags for consumer “records.lag” metrics1.1.0
198197KIP-224: Add configuration parameter `retries` to Streams API1.1.0
199198KIP-223 - Add per-topic min lead and per-partition lead metrics to KafkaConsumer2.0.0
200199KIP-222 - Add Consumer Group operations to Admin API2.0.0
201200KIP-221: Enhance DSL with Connecting Topic Creation and Repartition Hint2.6.0
202201KIP-220: Add AdminClient into Kafka Streams' ClientSupplier1.1.0
203202KIP-219 - Improve quota communication2.0.0
204203KIP-218: Make KafkaFuture.Function java 8 lambda compatible1.1.0
205204KIP-216: IQ should throw different exceptions for different errors2.5.0
206205KIP-215: Add topic regex support for Connect sinks1.1.0
207206KIP-214: Add zookeeper.max.in.flight.requests config to the broker1.1.0
208207KIP-213 Support non-key joining in KTable2.4.0 (WIP)
209208KIP-212: Enforce set of legal characters for connector names1.1.0
210209KIP-211: Revise Expiration Semantics of Consumer Group Offsets2.1.0
211210KIP-210 - Provide for custom error handling when Kafka Streams fails to produce1.1.0
212211KIP-208: Add SSL support to Kafka Connect REST interface1.1.0
213212KIP-207: Offsets returned by ListOffsetsResponse should be monotonically increasing even during a partition leader change2.2.0
214213KIP-206: Add support for UUID serialization and deserialization2.1.0
215214KIP-205: Add all() and range() API to ReadOnlyWindowStore1.1.0
216215KIP-204 : Adding records deletion operation to the new Admin Client API1.1.0
217216KIP-203: Add toLowerCase support to sasl.kerberos.principal.to.local rule 1.1.0
218217KIP-202: Move merge() from StreamsBuilder to KStream1.0.0
219218KIP-198: Remove ZK dependency from Streams Reset Tool1.0.0
220219KIP-197 Connect REST API should include the connector type when describing a connector1.0.0
221220KIP-196: Add metrics to Kafka Connect framework1.0.0
222221KIP-195: AdminClient.createPartitions1.0.0
223222KIP-192 : Provide cleaner semantics when idempotence is enabled1.0.0
224223KIP-191: KafkaConsumer.subscribe() overload that takes just Pattern1.0.0
225224KIP-190: Handle client-ids consistently between clients and brokers1.0.0
226225KIP-189: Improve principal builder interface and add support for SASL1.0.0
227226KIP-188 - Add new metrics to support health checks1.0.0
228227KIP-187 - Add cumulative count metric for all Kafka rate metrics1.0.0
229228KIP-186: Increase offsets retention default to 7 days2.0.0
230229KIP-183 - Change PreferredReplicaLeaderElectionCommand to use AdminClient2.2.0
231230KIP-182: Reduce Streams DSL overloads and allow easier use of custom storage engines1.0.0
232231KIP-180: Add a broker metric specifying the number of consumer group rebalances in progress1.1.0
233232KIP-177: Consumer perf tool should count rebalance time1.0.0
234233KIP-176: Remove deprecated new-consumer option for tools2.0.0
235234KIP-175: Additional '--describe' views for ConsumerGroupCommand1.1.0
236235KIP-174 - Deprecate and remove internal converter configs in WorkerConfig2.0.0
237236KIP-173: Add prefix to StreamsConfig to enable setting default internal topic configs1.0.0
238237KIP-171 - Extend Consumer Group Reset Offset for Stream Application1.1.0
239238KIP-168: Add GlobalTopicCount and GlobalPartitionCount metric per cluster1.0.0
240239KIP-167: Add interface for the state store restoration process1.0.0
241240

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

1.0.0
242241

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

1.0.0
243242KIP-162: Enable topic deletion by default1.0.0
244243KIP-161: streams deserialization exception handlers1.0.0
245244KIP-160: Augment KStream.print(), KStream.writeAsText() to allow users pass in extra parameters in the printed string1.0.0
246245KIP-158: Kafka Connect should allow source connectors to set topic-specific settings for new topics2.5.0 (WIP)
247246KIP-157 - Add consumer config options to streams reset tool1.0.0
248247KIP-156 Add option "dry run" to Streams application reset tool0.11.0.0
249248KIP-155 - Add range scan for windowed state stores0.11.0.0
250249KIP-154 Add Kafka Connect configuration properties for creating internal topics0.11.0.0
251250KIP-153: Include only client traffic in BytesOutPerSec metric0.11.0.0
252251KIP-152 - Improve diagnostics for SASL authentication failures1.0.0
253252KIP-151 Expose Connector type in REST API0.11.0.0
254253KIP-150 - Kafka-Streams Cogroup2.5.0 (WIP)
255254KIP-149: Enabling key access in ValueTransformer, ValueMapper, and ValueJoiner1.1.0 (partially implemented; inactive)
256255KIP-146 - Classloading Isolation in Connect

0.11.0.0

257256KIP-145 - Expose Record Headers in Kafka Connect1.1.0
258257KIP-144: Exponential backoff for broker reconnect attempts0.11.0.0
259258KIP-143: Controller Health Metrics0.11.0.0
260259KIP-140: Add administrative RPCs for adding, deleting, and listing ACLs0.11.0.0
261260KIP-138: Change punctuate semantics1.0.0
262261KIP-137: Enhance TopicCommand --describe to show topics marked for deletion0.11.0.0
263262KIP-136: Add Listener name to SelectorMetrics tags0.11.0.0
264263KIP-134: Delay initial consumer group rebalance0.11.0.0
265264KIP-133: Describe and Alter Configs Admin APIs0.11.0.0
266265KIP-130: Expose states of active tasks to KafkaStreams public API1.0.0
267266KIP-129: Streams Exactly-Once Semantics0.11.0.0
268267KIP-128: Add ByteArrayConverter for Kafka Connect0.11.0.0
269268KIP-126 - Allow KafkaProducer to split and resend oversized batches.0.11.0.0
270269KIP-124 - Request rate quotas0.11.0.0
271270KIP-123: Allow per stream/table timestamp extractor0.11.0.0
272271KIP-122: Add Reset Consumer Group Offsets tooling0.11.0.0
273272KIP-121: Add KStream peek method

0.11.0.0

274273KIP-120: Cleanup Kafka Streams builder API1.0.0
275274KIP-119: Drop Support for Scala 2.10 in Kafka 0.110.11.0.0
276275KIP-118: Drop Support for Java 72.0.0
277276KIP-117: Add a public AdminClient API for Kafka admin operations0.11.0.0
278277KIP-115: Enforce offsets.topic.replication.factor upon __consumer_offsets auto topic creation0.11.0.0
279278KIP-114: KTable state stores and improved semantics0.11.0.0
280279KIP-113: Support replicas movement between log directories1.1.0
281280KIP-112: Handle disk failure for JBOD1.0.0
282281KIP-110: Add Codec for ZStandard Compression2.1.0
283282KIP-109: Old Consumer Deprecation0.11.0.0
284283KIP-108: Create Topic Policy0.10.2.0
285284KIP-107: Add deleteRecordsBefore() API in AdminClient0.11.0.0
286285

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

0.11.0.0
287286KIP-105: Addition of Record Level for Sensors0.10.2.0
288287KIP-104: Granular Sensors for Streams 0.10.2.0
289288KIP-103: Separation of Internal and External traffic0.10.2.0
290289KIP-102 - Add close with timeout for consumers0.10.2.0
291290KIP-101 - Alter Replication Protocol to use Leader Epoch rather than High Watermark for Truncation0.11.0.0
292291KIP-100 - Relax Type constraints in Kafka Streams API0.10.2.0
293292KIP-99: Add Global Tables to Kafka Streams0.10.2.0
294293KIP-98 - Exactly Once Delivery and Transactional Messaging0.11.0.0
295294KIP-97: Improved Kafka Client RPC Compatibility Policy0.10.2.0
296295KIP-96 - Add per partition metrics for in-sync and assigned replica count0.10.2.0
297296KIP-94 Session Windows0.10.2.0
298297KIP-93: Improve invalid timestamp handling in Kafka Streams0.10.2.0
299298KIP-92 - Add per partition lag metrics to KafkaConsumer0.10.2.0
300299KIP-91 Provide Intuitive User Timeouts in The Producer2.1.0
301300KIP-90 - Remove zkClient dependency from Streams0.10.2.0
302301KIP-89: Allow sink connectors to decouple flush and offset commit0.10.2.0
303302KIP-88: OffsetFetch Protocol Update0.10.2.0
304303KIP-86: Configurable SASL callback handlers2.0.0
305304KIP-85: Dynamic JAAS configuration for Kafka clients0.10.2.0
306305KIP-84: Support SASL SCRAM mechanisms0.10.2.0
307306KIP-82 - Add Record Headers0.11.0.0
308307KIP-81: Bound Fetch memory usage in the consumer2.6.0 (WIP)
309308KIP-79 - ListOffsetRequest/ListOffsetResponse v1 and add timestamp search methods to the new consumer0.10.1.0
310309KIP-78: Cluster Id0.10.1.0
311310KIP-77: Improve Kafka Streams Join Semantics0.10.2.0
312311KIP-75 - Add per-connector Converters0.10.1.0
313312KIP-74: Add Fetch Response Size Limit in Bytes0.10.1.0
314313KIP-73: Replication Quotas0.10.1.0
315314KIP-72: Allow putting a bound on memory consumed by Incoming request 1.0.0
316315KIP-71: Enable log compaction and deletion to co-exist0.10.1.0
317316KIP-70: Revise Partition Assignment Semantics on New Consumer's Subscription Change0.10.1.0
318317KIP-67: Queryable state for Kafka Streams0.10.1.0
319318KIP-66: Single Message Transforms for Kafka Connect0.10.2.0 / 0.11.0.0
320319KIP-65: Expose timestamps to Connect0.10.1.0
321320KIP-63: Unify store and downstream caching in streams0.10.1.0
322321KIP-62: Allow consumer to send heartbeats from a background thread0.10.1.0
323322KIP-60 - Make Java client classloading more flexible0.10.1.0
324323KIP-58 - Make Log Compaction Point Configurable0.10.1.0
325324KIP-57 - Interoperable LZ4 Framing0.10.0.0
326325KIP-56: Allow cross origin HTTP requests on all HTTP methods0.10.0.0
327326KIP-55: Secure Quotas for Authenticated Users0.10.1.0
328327KIP-54: Sticky Partition Assignment Strategy0.11.0.0
329328KIP-52: Connector Control APIs0.10.0.0
330329KIP-51 - List Connectors REST API0.10.0.0
331330KIP-48 Delegation token support for Kafka1.1.0
332331KIP-45 - Standardize all client sequence interaction on j.u.Collection.0.10.0.0
333332KIP-43: Kafka SASL enhancements0.10.0.0
334333KIP-42: Add Producer and Consumer Interceptors0.10.0.0
335334KIP-41: Consumer Max Records0.10.0.0
336335KIP-40: ListGroups and DescribeGroup0.9.0.0
337336KIP-38: ZooKeeper Authentication0.9.0.0
338337KIP-36 - Rack aware replica assignment0.10.0.0
339338KIP-35 - Retrieving protocol version0.10.0.0
340339KIP-33 - Add a time based log index0.10.1.0
341340KIP-32 - Add timestamps to Kafka message0.10.0.0
342341KIP-31 - Move to relative offsets in compressed message sets0.10.0.0
343342KIP-28 - Add a processor client0.10.0.0
344343KIP-26 - Add Kafka Connect framework for data import/export0.9.0.0
345344KIP-25 - System test improvements0.9.0.0
346345KIP-22 - Expose a Partitioner interface in the new producer0.9.0.0
347346KIP-21 - Dynamic Configuration0.9.0.0 (WIP)
348347KIP-20 Enable log preallocate to improve consume performance under windows and some old Linux file system0.9.0.0
349348KIP-19 - Add a request timeout to NetworkClient0.9.0.0
350349KIP-16 - Automated Replica Lag Tuning0.9.0.0
351350KIP-15 - Add a close method with a timeout in the producer0.9.0.0
352351KIP-13 - Quota Design0.9.0.0
353352KIP-12 - Kafka Sasl/Kerberos and SSL implementation0.9.0.0
354353KIP-11 - Kafka Authorizer design0.9.0.0
355354KIP-8 - Add a flush method to the producer API0.9.0.0
356355KIP-4 - Metadata Protocol Changes0.10.0.0
357356KIP-4 - Command line and centralized administrative operations0.9.0.0, 0.10.0.0, 0.10.1.0
358357KIP-3 - Mirror Maker Enhancement0.9.0.0
359358KIP-2 - Refactor brokers to allow listening on multiple ports and IPs0.9.0.0
360359KIP-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-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 usersAccepted
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-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-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-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-516: Topic Identifiers & Topic Deletion State ImprovementsUnder 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-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: Suppress "unused config" warning

Under Discussion

KIP-560: Auto infer external topic partitions in stream reset tool

Under 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 Audit

Under Discussion

KIP-571: Add option to force remove members in StreamsResetterVoting
KIP-572: Improve timeouts and retries in Kafka StreamsUnder Discussion
KIP-573: Enable TLSv1.3 by defaultUnder Discussion
KIP-575: build a Kafka-Exporter by JavaUnder Discussion
KIP-576: Support dynamic update of more broker configs related to replicationUnder Discussion
KIP-577: Allow HTTP Response Headers Configured for Kafka ConnectUnder Discussion
KIP-579: new exception on min.insync.replicas > replication.factorVoting in progress
KIP-581: Value of optional null field which has default valueUnder Discussion
KIP-582: Add a "continue" option for Kafka Connect error handlingUnder Discussion
KIP-583: add tag "partition" to BrokerTopicMetrics so as to observe the partition metrics on the same brokerUnder Discussion
KIP-584: Versioning scheme for featuresUnder Discussion
KIP-585: Conditional SMTUnder Discussion

...