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Comment: Move KIP-446 to inactive

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KIP (please keep this sorted by KIP number)

Release

1KIP-551: Expose disk read and write metrics2.5.0 (WIP)
2KIP-544: Make metrics exposed via JMX configurable2.5.0 (WIP)
3KIP-543: Expand ConfigCommand's non-ZK functionality2.5.0 (WIP)
4KIP-541: Create a fetch.max.bytes configuration for the broker2.5.0
5KIP-538: Add a metric tracking the number of open connections with a given SSL cipher type2.5.0
6KIP-537: Increase default zookeeper session timeout2.5.0
7KIP-535: Allow state stores to serve stale reads during rebalanceWIP
8KIP-534: Reorganize checkpoint system in log cleaner to per partition WIP
9

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

WIP
10KIP-531: Drop support for Scala 2.11 in Kafka 2.52.5.0 (WIP)
11KIP-530: Consider renaming 'UsePreviousTimeOnInvalidTimeStamp' class to 'UsePartitionTimeOnInvalidTimeStamp'2.5.0 (WIP)
12KIP-528: Deprecate PartitionGrouper configuration and interface2.4.0
13KIP-527: Add VoidSerde to Serdes2.5.0
14KIP-525 - Return topic metadata and configs in CreateTopics response2.4.0 
15KIP-524: Allow users to choose config source when describing configs2.5.0 (WIP)
16KIP-523: Add KStream#toTable to the Streams DSL2.5.0 (WIP)
17KIP-521: Enable redirection of Connect's log4j messages to a file by default2.4.0
18KIP-517: Add consumer metrics to observe user poll behavior2.4.0
19KIP-511: Collect and Expose Client's Name and Version in the Brokers2.4.0 (protocol) / 2.5.0 (metric)
20KIP-507: Securing Internal Connect REST Endpoints2.4.0
21KIP-504 - Add new Java Authorizer Interface2.4.0 
22KIP-503: Add metric for number of topics marked for deletion2.4.0 
23KIP-501: Avoid out-of-sync or offline partitions when follower fetch requests not processed in timeWIP
24KIP-500: Replace ZooKeeper with a Self-Managed Metadata Quorum
25KIP-497: Add inter-broker API to alter ISR2.6.0 (WIP)
26KIP-496: Administrative API to delete consumer offsets2.4.0 
27KIP-495: Dynamically Adjust Log Levels in Connect2.4.0
28KIP-492: Add java security providers in Kafka Security config2.4.0 
29KIP-488: Clean up Sum,Count,Total Metrics2.4.0
30KIP-484: Expose metrics for group and transaction metadata loading duration2.4.0 
31KIP-482: The Kafka Protocol should Support Optional Tagged Fields2.4.0 
32KIP-481: SerDe Improvements for Connect Decimal type in JSON2.4.0
33KIP-480: Sticky Partitioner2.4.0
34KIP-479: Add StreamJoined config object to Join2.4.0
35KIP-478 - Strongly typed Processor APIWIP
36KIP-476: Add Java AdminClient Interface2.4.0
37KIP-475: New Metrics to Measure Number of Tasks on a Connector2.4.0
38KIP-474: To deprecate WindowStore#put(key, value)2.4.0
39KIP-471: Expose RocksDB Metrics in Kafka Streams

2.4.0 (partially implemented; completion blocked)

40KIP-470: TopologyTestDriver test input and output usability improvements2.4.0 
41KIP-467: Augment ProduceResponse error messaging for specific culprit records2.4.0 (partially implemented) / 2.5.0
42KIP-466: Add support for List<T> serialization and deserialization2.4.0 (WIP)
43KIP-465: Add Consolidated Connector Endpoint to Connect REST API2.3.0
44KIP-464: Defaults for AdminClient#createTopic2.4.0
45KIP-462: Use local thread id for KStreams2.3.0
46KIP-461: Improve Replica Fetcher behavior at handling partition failure2.3.0
47KIP-460: Admin Leader Election RPC2.4.0
48KIP-458: Connector Client Config Override Policy2.3.0
49KIP-455: Create an Administrative API for Replica Reassignment2.4.0 (API/broker logic)
2.5.0 (tools changes)
50KIP-454: Expansion of the ConnectClusterState interface2.3.0
51KIP-453: Add close() method to RocksDBConfigSetter2.3.0
52KIP-449: Add connector contexts to log messages in Connect workers 2.3.0
53KIP-447: Producer scalability for exactly once semantics2.5.0
5455KIP-446: Add changelog topic configuration to KTable suppress2.5.0 (WIP)KIP-445: In-memory Session Store2.3.0
5655KIP-444: Augment metrics for Kafka Streams2.4.0 (partially implemented) / 2.5.0 (WIP)
5756

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

2.3.0
5857KIP-442: Return to default max poll interval in Streams2.3.0
5958KIP-441: Smooth Scaling Out for Kafka Streams2.6.0 (WIP)
6059KIP-440: Extend Connect Converter to support headers2.4.0
6160KIP-436: Add a metric indicating start time2.3.0
6261KIP-434: Add Replica Fetcher and Log Cleaner Count Metrics2.4.0 (WIP)
6362KIP-430 - Return Authorized Operations in Describe Responses2.3.0
6463KIP-429: Kafka Consumer Incremental Rebalance Protocol2.4.0 (WIP)
6564KIP-428: Add in-memory window store2.3.0
6665KIP-427: Add AtMinIsr topic partition category (new metric & TopicCommand option)2.3.0
6766KIP-425: Add some Log4J Kafka Appender Properties for Producing to Secured Brokers2.3.0
6867KIP-421: Support resolving externalized secrets in AbstractConfig2.3.0
6968KIP-420: Add Single Value Fetch in Session Stores2.2.0
7069KIP-417: Allow JmxTool to connect to a secured RMI port2.3.0
7170KIP-415: Incremental Cooperative Rebalancing in Kafka Connect2.3.0
7271KIP-414: Expose Embedded ClientIds in Kafka Streams2.2.0
7372KIP-412: Extend Admin API to support dynamic application log levels2.4.0 
7473

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

2.3.0
7574KIP-402: Improve fairness in SocketServer processors2.2.0 (partially implemented) / 2.3.0
7675KIP-401: TransformerSupplier/ProcessorSupplier StateStore connecting2.5.0 (WIP)
7776KIP-396: Add Commit/List Offsets Operations to AdminClient2.5.0 (WIP)
7877KIP-394: Require member.id for initial join group request2.2.0
7978KIP-393: Time windowed serde to properly deserialize changelog input topic2.2.0
8079KIP-392: Allow consumers to fetch from closest replica2.4.0
8180KIP-389: Introduce a configurable consumer group size limit2.2.0
8281KIP-386: Standardize on Min/Avg/Max metrics' default value2.2.0
8382KIP-382: MirrorMaker 2.02.4.0
8483

KIP-379: Multiple Consumer Group Management

2.4.0 
8584KIP-380: Detect outdated control requests and bounced brokers using broker generation2.2.0
8685KIP-377: TopicCommand to use AdminClient2.2.0
8786KIP-376: Implement AutoClosable on appropriate classes that want to be used in a try-with-resource statement2.2.0
8887KIP-374: Add '--help' option to all available Kafka CLI commands2.2.0
8988KIP-372: Naming Repartition Topics for Joins and Grouping2.1.0
9089KIP-371: Add a configuration to build custom SSL principal name2.2.0
9190KIP-369: Alternative Partitioner to Support "Always Round-Robin" Selection2.4.0
9291KIP 368: Allow SASL Connections to Periodically Re-Authenticate2.2.0
9392KIP-367 Introduce close(Duration) to Producer and AdminClient instead of close(long, TimeUnit)2.2.0
9493KIP-366: Make FunctionConversions deprecated2.1.0
9594KIP-365: Materialized, Serialized, Joined, Consumed and Produced with implicit Serde2.1.0
9695KIP-361: Add Consumer Configuration to Disable Auto Topic Creation2.3.0
9796KIP-360: Improve handling of unknown producer2.4.0 (partially implemented) / 2.5.0
9897KIP-359: Verify leader epoch in produce requests2.4.0 (WIP)
9998KIP-358: Migrate Streams API to Duration instead of long ms times2.1.0
10099KIP-357: Add support to list ACLs per principal2.1.0
101100KIP-356: Add withCachingDisabled() to StoreBuilder2.1.0
102101KIP-354: Add a Maximum Log Compaction Lag2.3.0
103102KIP-353: Improve Kafka Streams Timestamp Synchronization2.1.0
104103KIP-352: Distinguish URPs caused by reassignment2.5.0 
105104KIP-351: Add --under-min-isr option to describe topics command2.3.0
106105KIP-346: Improve LogCleaner behavior on error2.1.0
107106KIP-345: Introduce static membership protocol to reduce consumer rebalances2.4.0
108107KIP-342 Add support for custom SASL extensions in OAuthBearer authentication2.1.0
109108KIP-341: Update Sticky Assignor's User Data Protocol2.3.0
110109KIP-340: Allow kafka-reassign-partitions.sh and kafka-log-dirs.sh to take admin client property file2.1.0
111110KIP-339: Create a new IncrementalAlterConfigs API2.3.0 
112111KIP-338 Support to exclude the internal topics in kafka-topics.sh command2.1.0
113112KIP-336: Consolidate ExtendedSerializer/Serializer and ExtendedDeserializer/Deserializer2.1.0
114113KIP-332: Update AclCommand to use AdminClient API2.1.0
115114KIP-331 Add default implementation to close() and configure() for Serializer, Deserializer and Serde2.3.0
116115KIP-330: Add retentionPeriod in SessionBytesStoreSupplier2.1.0
117116KIP-328: Ability to suppress updates for KTables2.1.0 (partially implemented; inactive)
118117KIP-324: Add method to get metrics() in AdminClient2.1.0
119118KIP-322: Return new error code for DeleteTopics API when topic deletion disabled.2.1.0
120119KIP-321: Update TopologyDescription to better represent Source and Sink Nodes2.1.0
121120KIP-320: Allow fetchers to detect and handle log truncation2.1.0 (partially implemented) / 2.2.0
122121KIP-319: Replace segments with segmentInterval in WindowBytesStoreSupplier2.1.0
123122KIP-313: Add KStream.flatTransform and KStream.flatTransformValues 

2.2.0 (partially implemented)

/ 2.3.0

124123KIP-312 Add Overloaded StreamsBuilder Build Method to Accept java.util.Properties2.1.0
125124KIP-309: Add toUpperCase support to sasl.kerberos.principal.to.local rule2.4.0
126125KIP-308: Support dynamic update of max.connections.per.ip/max.connections.per.ip.overrides2.1.0
127126KIP-307: Allow to define custom processor names with KStreams DSL2.3.0 (partially implemented) / 2.4.0
128127KIP-306: Configuration for Delaying Response to Failed Authentication2.1.0
129128KIP-305: Add Connect primitive number converters2.0.0
130129KIP-303: Add Dynamic Routing in Streams Sink2.0.0
131130KIP-302 - Enable Kafka clients to use all DNS resolved IP addresses2.1.0
132131KIP-300: Add Windowed KTable API in StreamsBuilder3.0.0 (not implemented; inactive)
133132KIP-298: Error Handling in Connect2.0.0
134133KIP-297: Externalizing Secrets for Connect Configurations2.0.0
135134KIP-295 Add Streams Configuration Allowing for Optional Topology Optimization2.0.0
136135KIP-294 - Enable TLS hostname verification by default2.0.0
137136

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

Accepted
138137KIP-292: Add transformValues() method to KTable2.0.0
139138KIP-290: Support for Prefixed ACLs2.0.0
140139KIP-289: Improve the default group id behavior in KafkaConsumer2.2.0
141140KIP-285: Connect Rest Extension Plugin2.0.0
142141KIP-284: Set default retention ms for Streams repartition topics to Long.MAX_VALUE2.0.0
143142KIP-283: Efficient Memory Usage for Down-Conversion2.0.0
144143KIP-282: Add the listener name to the authentication context2.0.0
145144KIP-281: ConsumerPerformance: Increase Polling Loop Timeout and Make It Reachable by the End User2.0.0
146145KIP-280: Enhanced log compaction2.5.0 (WIP)
147146KIP-279: Fix log divergence between leader and follower after fast leader fail over2.0.0
148147KIP-278 - Add version option to Kafka's commands2.0.0
149148KIP-277 - Fine Grained ACL for CreateTopics API2.0.0
150149KIP-276 - Add StreamsConfig prefix for different consumers2.0.0
151150KIP-274: Kafka Streams Skipped Records Metrics2.0.0
152151KIP-272: Add API version tag to broker's RequestsPerSec metric2.0.0
153152KIP-270 - A Scala Wrapper Library for Kafka Streams2.0.0
154153KIP-268: Simplify Kafka Streams Rebalance Metadata Upgrade2.0.0
155154KIP-267: Add Processor Unit Test Support to Kafka Streams Test Utils2.0.0
156155KIP-266: Fix consumer indefinite blocking behavior2.0.0
157156KIP-265: Make Windowed Serde to public APIs2.0.0
158157KIP-261: Add Single Value Fetch in Window Stores2.0.0
159158KIP-258: Allow to Store Record Timestamps in RocksDB2.3.0 (partially implemented; inactive)
160159KIP-257 - Configurable Quota Management2.0.0
161160KIP-255: OAuth Authentication via SASL/OAUTHBEARER2.0.0
162161KIP-251: Allow timestamp manipulation in Processor API2.0.0
163162KIP-249: Add Delegation Token Operations to KafkaAdminClient2.0.0
164163KIP-247: Add public test utils for Kafka Streams1.1.0
165164KIP-245: Use Properties instead of StreamsConfig in KafkaStreams constructor2.0.0
166165KIP-244: Add Record Header support to Kafka Streams Processor API2.0.0
167166KIP-243: Make ProducerConfig and ConsumerConfig constructors public1.1.0
168167KIP-239 Add queryableStoreName() to GlobalKTable1.1.0
169168KIP-238: Expose Kafka cluster ID in Connect REST API1.1.0
170169KIP-237: More Controller Health Metrics2.0.0
171170KIP-235: Add DNS alias support for secured connection2.1.0
172171KIP-233: Simplify StreamsBuilder#addGlobalStore1.1.0
173172KIP-231: Improve the Required ACL of ListGroups API2.1.0
174173KIP-229: DeleteGroups API1.1.0
175174KIP-227 - Introduce Incremental FetchRequests to Increase Partition Scalability1.1.0
176175KIP-226 - Dynamic Broker Configuration1.1.0
177176KIP-225 - Use tags for consumer “records.lag” metrics1.1.0
178177KIP-224: Add configuration parameter `retries` to Streams API1.1.0
179178KIP-223 - Add per-topic min lead and per-partition lead metrics to KafkaConsumer2.0.0
180179KIP-222 - Add Consumer Group operations to Admin API2.0.0
181180KIP-221: Enhance DSL with Connecting Topic Creation and Repartition Hint2.4.0 (WIP)
182181KIP-220: Add AdminClient into Kafka Streams' ClientSupplier1.1.0
183182KIP-219 - Improve quota communication2.0.0
184183KIP-218: Make KafkaFuture.Function java 8 lambda compatible1.1.0
185184KIP-215: Add topic regex support for Connect sinks1.1.0
186185KIP-214: Add zookeeper.max.in.flight.requests config to the broker1.1.0
187186KIP-213 Support non-key joining in KTable2.4.0 (WIP)
188187KIP-212: Enforce set of legal characters for connector names1.1.0
189188KIP-211: Revise Expiration Semantics of Consumer Group Offsets2.1.0
190189KIP-210 - Provide for custom error handling when Kafka Streams fails to produce1.1.0
191190KIP-208: Add SSL support to Kafka Connect REST interface1.1.0
192191KIP-207: Offsets returned by ListOffsetsResponse should be monotonically increasing even during a partition leader change2.2.0
193192KIP-206: Add support for UUID serialization and deserialization2.1.0
194193KIP-205: Add all() and range() API to ReadOnlyWindowStore1.1.0
195194KIP-204 : Adding records deletion operation to the new Admin Client API1.1.0
196195KIP-203: Add toLowerCase support to sasl.kerberos.principal.to.local rule 1.1.0
197196KIP-202: Move merge() from StreamsBuilder to KStream1.0.0
198197KIP-198: Remove ZK dependency from Streams Reset Tool1.0.0
199198KIP-197 Connect REST API should include the connector type when describing a connector1.0.0
200199KIP-196: Add metrics to Kafka Connect framework1.0.0
201200KIP-195: AdminClient.createPartitions1.0.0
202201KIP-192 : Provide cleaner semantics when idempotence is enabled1.0.0
203202KIP-191: KafkaConsumer.subscribe() overload that takes just Pattern1.0.0
204203KIP-190: Handle client-ids consistently between clients and brokers1.0.0
205204KIP-189: Improve principal builder interface and add support for SASL1.0.0
206205KIP-188 - Add new metrics to support health checks1.0.0
207206KIP-187 - Add cumulative count metric for all Kafka rate metrics1.0.0
208207KIP-186: Increase offsets retention default to 7 days2.0.0
209208KIP-183 - Change PreferredReplicaLeaderElectionCommand to use AdminClient2.2.0
210209KIP-182: Reduce Streams DSL overloads and allow easier use of custom storage engines1.0.0
211210KIP-180: Add a broker metric specifying the number of consumer group rebalances in progress1.1.0
212211KIP-177: Consumer perf tool should count rebalance time1.0.0
213212KIP-176: Remove deprecated new-consumer option for tools2.0.0
214213KIP-175: Additional '--describe' views for ConsumerGroupCommand1.1.0
215214KIP-174 - Deprecate and remove internal converter configs in WorkerConfig2.0.0
216215KIP-173: Add prefix to StreamsConfig to enable setting default internal topic configs1.0.0
217216KIP-171 - Extend Consumer Group Reset Offset for Stream Application1.1.0
218217KIP-168: Add GlobalTopicCount and GlobalPartitionCount metric per cluster1.0.0
219218KIP-167: Add interface for the state store restoration process1.0.0
220219

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

1.0.0
221220

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

1.0.0
222221KIP-162: Enable topic deletion by default1.0.0
223222KIP-161: streams deserialization exception handlers1.0.0
224223KIP-160: Augment KStream.print(), KStream.writeAsText() to allow users pass in extra parameters in the printed string1.0.0
225224KIP-158: Kafka Connect should allow source connectors to set topic-specific settings for new topics2.5.0 (WIP)
226225KIP-157 - Add consumer config options to streams reset tool1.0.0
227226KIP-156 Add option "dry run" to Streams application reset tool0.11.0.0
228227KIP-155 - Add range scan for windowed state stores0.11.0.0
229228KIP-154 Add Kafka Connect configuration properties for creating internal topics0.11.0.0
230229KIP-153: Include only client traffic in BytesOutPerSec metric0.11.0.0
231230KIP-152 - Improve diagnostics for SASL authentication failures1.0.0
232231KIP-151 Expose Connector type in REST API0.11.0.0
233232KIP-150 - Kafka-Streams Cogroup2.5.0 (WIP)
234233KIP-149: Enabling key access in ValueTransformer, ValueMapper, and ValueJoiner1.1.0 (partially implemented; inactive)
235234KIP-146 - Classloading Isolation in Connect

0.11.0.0

236235KIP-145 - Expose Record Headers in Kafka Connect1.1.0
237236KIP-144: Exponential backoff for broker reconnect attempts0.11.0.0
238237KIP-143: Controller Health Metrics0.11.0.0
239238KIP-140: Add administrative RPCs for adding, deleting, and listing ACLs0.11.0.0
240239KIP-138: Change punctuate semantics1.0.0
241240KIP-137: Enhance TopicCommand --describe to show topics marked for deletion0.11.0.0
242241KIP-136: Add Listener name to SelectorMetrics tags0.11.0.0
243242KIP-134: Delay initial consumer group rebalance0.11.0.0
244243KIP-133: Describe and Alter Configs Admin APIs0.11.0.0
245244KIP-130: Expose states of active tasks to KafkaStreams public API1.0.0
246245KIP-129: Streams Exactly-Once Semantics0.11.0.0
247246KIP-128: Add ByteArrayConverter for Kafka Connect0.11.0.0
248247KIP-126 - Allow KafkaProducer to split and resend oversized batches.0.11.0.0
249248KIP-124 - Request rate quotas0.11.0.0
250249KIP-123: Allow per stream/table timestamp extractor0.11.0.0
251250KIP-122: Add Reset Consumer Group Offsets tooling0.11.0.0
252251KIP-121: Add KStream peek method

0.11.0.0

253252KIP-120: Cleanup Kafka Streams builder API1.0.0
254253KIP-119: Drop Support for Scala 2.10 in Kafka 0.110.11.0.0
255254KIP-118: Drop Support for Java 72.0.0
256255KIP-117: Add a public AdminClient API for Kafka admin operations0.11.0.0
257256KIP-115: Enforce offsets.topic.replication.factor upon __consumer_offsets auto topic creation0.11.0.0
258257KIP-114: KTable state stores and improved semantics0.11.0.0
259258KIP-113: Support replicas movement between log directories1.1.0
260259KIP-112: Handle disk failure for JBOD1.0.0
261260KIP-110: Add Codec for ZStandard Compression2.1.0
262261KIP-109: Old Consumer Deprecation0.11.0.0
263262KIP-108: Create Topic Policy0.10.2.0
264263KIP-107: Add deleteRecordsBefore() API in AdminClient0.11.0.0
265264

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

0.11.0.0
266265KIP-105: Addition of Record Level for Sensors0.10.2.0
267266KIP-104: Granular Sensors for Streams 0.10.2.0
268267KIP-103: Separation of Internal and External traffic0.10.2.0
269268KIP-102 - Add close with timeout for consumers0.10.2.0
270269KIP-101 - Alter Replication Protocol to use Leader Epoch rather than High Watermark for Truncation0.11.0.0
271270KIP-100 - Relax Type constraints in Kafka Streams API0.10.2.0
272271KIP-99: Add Global Tables to Kafka Streams0.10.2.0
273272KIP-98 - Exactly Once Delivery and Transactional Messaging0.11.0.0
274273KIP-97: Improved Kafka Client RPC Compatibility Policy0.10.2.0
275274KIP-96 - Add per partition metrics for in-sync and assigned replica count0.10.2.0
276275KIP-94 Session Windows0.10.2.0
277276KIP-93: Improve invalid timestamp handling in Kafka Streams0.10.2.0
278277KIP-92 - Add per partition lag metrics to KafkaConsumer0.10.2.0
279278KIP-91 Provide Intuitive User Timeouts in The Producer2.1.0
280279KIP-90 - Remove zkClient dependency from Streams0.10.2.0
281280KIP-89: Allow sink connectors to decouple flush and offset commit0.10.2.0
282281KIP-88: OffsetFetch Protocol Update0.10.2.0
283282KIP-86: Configurable SASL callback handlers2.0.0
284283KIP-85: Dynamic JAAS configuration for Kafka clients0.10.2.0
285284KIP-84: Support SASL SCRAM mechanisms0.10.2.0
286285KIP-82 - Add Record Headers0.11.0.0
287286KIP-81: Bound Fetch memory usage in the consumer2.6.0 (WIP)
288287KIP-79 - ListOffsetRequest/ListOffsetResponse v1 and add timestamp search methods to the new consumer0.10.1.0
289288KIP-78: Cluster Id0.10.1.0
290289KIP-77: Improve Kafka Streams Join Semantics0.10.2.0
291290KIP-75 - Add per-connector Converters0.10.1.0
292291KIP-74: Add Fetch Response Size Limit in Bytes0.10.1.0
293292KIP-73: Replication Quotas0.10.1.0
294293KIP-72: Allow putting a bound on memory consumed by Incoming request 1.0.0
295294KIP-71: Enable log compaction and deletion to co-exist0.10.1.0
296295KIP-70: Revise Partition Assignment Semantics on New Consumer's Subscription Change0.10.1.0
297296KIP-67: Queryable state for Kafka Streams0.10.1.0
298297KIP-66: Single Message Transforms for Kafka Connect0.10.2.0 / 0.11.0.0
299298KIP-65: Expose timestamps to Connect0.10.1.0
300299KIP-63: Unify store and downstream caching in streams0.10.1.0
301300KIP-62: Allow consumer to send heartbeats from a background thread0.10.1.0
302301KIP-60 - Make Java client classloading more flexible0.10.1.0
303302KIP-58 - Make Log Compaction Point Configurable0.10.1.0
304303KIP-57 - Interoperable LZ4 Framing0.10.0.0
305304KIP-56: Allow cross origin HTTP requests on all HTTP methods0.10.0.0
306305KIP-55: Secure Quotas for Authenticated Users0.10.1.0
307306KIP-54: Sticky Partition Assignment Strategy0.11.0.0
308307KIP-52: Connector Control APIs0.10.0.0
309308KIP-51 - List Connectors REST API0.10.0.0
310309KIP-48 Delegation token support for Kafka1.1.0
311310KIP-45 - Standardize all client sequence interaction on j.u.Collection.0.10.0.0
312311KIP-43: Kafka SASL enhancements0.10.0.0
313312KIP-42: Add Producer and Consumer Interceptors0.10.0.0
314313KIP-41: Consumer Max Records0.10.0.0
315314KIP-40: ListGroups and DescribeGroup0.9.0.0
316315KIP-38: ZooKeeper Authentication0.9.0.0
317316KIP-36 - Rack aware replica assignment0.10.0.0
318317KIP-35 - Retrieving protocol version0.10.0.0
319318KIP-33 - Add a time based log index0.10.1.0
320319KIP-32 - Add timestamps to Kafka message0.10.0.0
321320KIP-31 - Move to relative offsets in compressed message sets0.10.0.0
322321KIP-28 - Add a processor client0.10.0.0
323322KIP-26 - Add Kafka Connect framework for data import/export0.9.0.0
324323KIP-25 - System test improvements0.9.0.0
325324KIP-22 - Expose a Partitioner interface in the new producer0.9.0.0
326325KIP-21 - Dynamic Configuration0.9.0.0 (WIP)
327326KIP-20 Enable log preallocate to improve consume performance under windows and some old Linux file system0.9.0.0
328327KIP-19 - Add a request timeout to NetworkClient0.9.0.0
329328KIP-16 - Automated Replica Lag Tuning0.9.0.0
330329KIP-15 - Add a close method with a timeout in the producer0.9.0.0
331330KIP-13 - Quota Design0.9.0.0
332331KIP-12 - Kafka Sasl/Kerberos and SSL implementation0.9.0.0
333332KIP-11 - Kafka Authorizer design0.9.0.0
334333KIP-8 - Add a flush method to the producer API0.9.0.0
335334KIP-4 - Metadata Protocol Changes0.10.0.0
336335KIP-4 - Command line and centralized administrative operations0.9.0.0, 0.10.0.0, 0.10.1.0
337336KIP-3 - Mirror Maker Enhancement0.9.0.0
338337KIP-2 - Refactor brokers to allow listening on multiple ports and IPs0.9.0.0
339338KIP-1 - Remove support of request.required.acks0.9.0.0

...

KIPComment
KIP-6 - New reassignment partition logic for rebalancingNeeds more detail
KIP-10 - Running Producer, Consumers and Brokers on Mesos
KIP-14 - Tools standardization
KIP-17 - Add HighwaterMarkOffset to OffsetFetchResponse
KIP-23 - Add JSON/CSV output and looping options to ConsumerGroupCommand
KIP-27 - Conditional Publish
KIP-30 - Allow for brokers to have plug-able consensus and meta data storage sub systems
KIP-37 - Add Namespaces to Kafka
KIP-39: Pinning controller to broker
KIP-44 - Allow Kafka to have a customized security protocol
KIP-46 - Self Healing
KIP-47 - Add timestamp-based log deletion policy
KIP-49 - Fair Partition Assignment Strategy
KIP-53 - Add custom policies for reconnect attempts to NetworkdClient
KIP-59: Proposal for a kafka broker command
KIP-64 -Allow underlying distributed filesystem to take over replication depending on configuration
KIP-68 Add a consumed log retention before log retention
KIP-69 - Kafka Schema RegistryDraft
KIP-76 Enable getting password from executable rather than passing as plaintext in config files
KIP-87 - Add Compaction Tombstone FlagPossibly displaced by KIP-82
KIP-95: Incremental Batch Processing for Kafka Streams
KIP-159: Introducing Rich functions to Streams
KIP-260: add primary join operation for Stream-Stream join (WIP)Draft

KIP-269: Substitution Within Configuration Values


KIP-311: Async processing with dynamic scheduling in Kafka Streams
KIP-314: KTable to GlobalKTable Bi-directional Join
KIP-326: Schedulable KTable as Graph source
KIP-349: Priorities for Source Topics

Functionality can be realized with existing API although at a lower level. 

KIP-335: Consider configurations for KafkaStreams
KIP-362: Support Dynamic Session Window
KIP-378: Enable Dependency Injection for Kafka Streams handlers
KIP-406: GlobalStreamThread should honor custom offset policy.
KIP-408: Add asynchronous processing to Kafka Streams
KIP-418: A method-chaining way to branch KStream
KIP-446: Add changelog topic configuration to KTable suppressAuthor abandoned implementation, KIP content is still valid
KIP-450: Sliding Window Aggregations in the DSL
KIP-457: Add DISCONNECTED status to Kafka Streams
KIP-459: Improve KafkaStreams#close
KIP-463: Auto-configure non-default Serdes passed alongside the TopologyBuilder
KIP-508: Make Suppression State Queriable

...