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<h1 class="content-title">Blog</h1>
<article>
<h2 class="bullet">
<a id="apache_kafka_362_release_announcement"></a>
<a href="#apache_kafka_362_release_announcement">Apache Kafka 3.6.2 Release Announcement</a>
</h2>
4 April 2024 - Manikumar Reddy O. (<a href="https://www.linkedin.com/in/15mani/">@Manikumar</a>)
<p>We are proud to announce the release of Apache Kafka 3.6.2. This is a bugfix release. It contains 28 fixes. For a full list of changes, be sure to check the <a href="https://archive.apache.org/dist/kafka/3.6.2/RELEASE_NOTES.html">release notes</a>.</p>
<p>See the <a href="https://kafka.apache.org/36/documentation.html#upgrade_3_6_2">Upgrading to 3.6.2 from any version 0.8.x through 3.5.x</a> section in the documentation for the list of notable changes and detailed upgrade steps.</p>
<h3>Summary</h3>
<p>This was a community effort, so thank you to everyone who contributed to this release:</br>
Akhilesh Chaganti, Andrew Schofield, Anton Liauchuk, Bob Barrett, Bruno Cadonna, Cheng-Kai, Zhang, Chia-Ping Tsai, Chris Egerton, Colin P. McCabe, Colin Patrick McCabe, David Arthur, David Jacot, David Mao, Divij Vaidya, Edoardo Comar, Emma Humber, Gaurav Narula, Greg Harris, hudeqi, Ismael Juma, Jason Gustafson, Jim Galasyn, Joel Hamill, Johnny Hsu, José Armando García Sancio, Justine Olshan, Luke Chen, Manikumar Reddy, Matthias J. Sax, Mayank Shekhar Narula, Mickael Maison, Mike Lloyd, Paolo Patierno, PoAn Yang, Ron Dagostino, Sagar Rao, Stanislav Kozlovski, Walker Carlson, Yash Mayya
</p>
</article>
<article>
<h2 class="bullet">
<a id="apache_kafka_370_release_announcement"></a>
<a href="#apache_kafka_370_release_announcement">Apache Kafka 3.7.0 Release Announcement</a>
</h2>
27 February 2024 - Stanislav Kozlovski (<a href="https://twitter.com/BdKozlovski">@BdKozlovski</a>)
<p>We are proud to announce the release of Apache Kafka 3.7.0. This release contains many new features and improvements. This blog post will highlight some of the more prominent features. For a full list of changes, be sure to check the <a href="https://downloads.apache.org/kafka/3.7.0/RELEASE_NOTES.html">release notes</a>.</p>
<p>See the <a href="https://kafka.apache.org/documentation.html#upgrade_3_7_0">Upgrading to 3.7.0 from any version 0.8.x through 3.6.x</a> section in the documentation for the list of notable changes and detailed upgrade steps.</p>
<p>
In the last release, 3.6,
<a href="https://kafka.apache.org/documentation/#kraft_zk_migration">the ability to migrate Kafka clusters from a ZooKeeper metadata system</a>
to a KRaft metadata system was ready for usage in production environments with one caveat -- JBOD was not yet available for KRaft clusters.
In this release, we are shipping an early access release of JBOD in KRaft. (See <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-858%3A+Handle+JBOD+broker+disk+failure+in+KRaft">KIP-858</a> and the <a href="https://cwiki.apache.org/confluence/display/KAFKA/Kafka+JBOD+in+KRaft+Early+Access+Release+Notes">release notes</a> for details).
</p>
<p>
Additionally, client APIs released prior to Apache Kafka 2.1 are now marked deprecated in 3.7 and will be removed in Apache Kafka 4.0. See <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-896%3A+Remove+old+client+protocol+API+versions+in+Kafka+4.0">KIP-896</a> for details and RPC versions that are now deprecated.
</p>
<p>
Java 11 support for the Kafka broker is also marked deprecated in 3.7, and is planned to be removed in Kafka 4.0. See <a href="https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=284789510">KIP-1013</a> for more details. Note that clients can continue to use JDK >= 11 to connect to Kafka brokers.
</p>
<p>
<i>Note: ZooKeeper is marked as deprecated since the 3.5.0 release. ZooKeeper is planned to be removed in Apache Kafka 4.0. For more information, please see the documentation for <a href="https://kafka.apache.org/documentation/#zk_depr">ZooKeeper Deprecation</a></i>.
</p>
<h3>Kafka Broker, Controller, Producer, Consumer and Admin Client</h3>
<ul>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-858%3A+Handle+JBOD+broker+disk+failure+in+KRaft">(Early Access) KIP-858 Handle JBOD broker disk failure in KRaft</a>:
</b><br>This update closes the gap on one of the last major missing features in KRaft by adding JBOD support in KRaft-based clusters. Note that it is not yet recommended for use in production environments. Please refer to the <a href="https://cwiki.apache.org/confluence/display/KAFKA/Kafka+JBOD+in+KRaft+Early+Access+Release+Notes">release notes</a> to help us test it and provide feedback at <a href="https://issues.apache.org/jira/browse/KAFKA-16061">KAFKA-16061</a>.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-714%3A+Client+metrics+and+observability">KIP-714 Client metrics and observability</a>:
</b><br>With KIP-714, operators get better visibility into the clients connecting to their cluster with broker-side support of client-level metrics via a standardized telemetry interface.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-1000%3A+List+Client+Metrics+Configuration+Resources">KIP-1000 List Client Metrics Configuration Resources</a>:
</b><br>KIP-1000 supports KIP-714 by introducing a way to create, read, update, and delete the client metrics configuration resources using the existing RPCs and the kafka-configs.sh tool.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-848%3A+The+Next+Generation+of+the+Consumer+Rebalance+Protocol">(Early Access) KIP-848 The Next Generation of the Consumer Rebalance Protocol</a>:
</b><br>The new simplified Consumer Rebalance Protocol moves complexity away from the consumer and into the Group Coordinator within the broker and completely revamps the protocol to be incremental in nature. It provides the same guarantee as the current protocol––but better and more efficient, including no longer relying on a global synchronization barrier. <a href="https://cwiki.apache.org/confluence/display/KAFKA/The+Next+Generation+of+the+Consumer+Rebalance+Protocol+%28KIP-848%29+-+Early+Access+Release+Notes">See the early access release notes for more information.</a>
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-951%3A+Leader+discovery+optimisations+for+the+client">KIP-951 Leader discovery optimisations for the client</a>:
</b><br>KIP-951 optimizes the time it takes for a client to discover the new leader of a partition, leading to reduced end-to-end latency of produce/fetch requests in the presence of leadership changes (broker restarts, partition reassignments, etc.).
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-975%3A+Docker+Image+for+Apache+Kafka">KIP-975 Docker Image for Apache Kafka</a>:
</b><br>Introduces an official Apache Kafka Docker image, enabling quicker testing and deployment, as well as onboarding of developers.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-580%3A+Exponential+Backoff+for+Kafka+Clients">KIP-580 Exponential Backoff for Kafka Clients</a>:
</b><br>Changes the client’s retry backoff time used for retrying failed requests from a static one to an exponentially-increasing one. This should help reduce slow metadata convergence after broker failure due to overload.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-963%3A+Additional+metrics+in+Tiered+Storage">KIP-963 Additional metrics in Tiered Storage</a>:
</b><br>KIP-405 brought the early access of Tiered Storage, and with this update we’re introducing new metrics for the feature, allowing you to better monitor performance, troubleshoot, and prevent issues.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-979%3A+Allow+independently+stop+KRaft+processes">KIP-979 Allow independently stop KRaft processes</a>:
</b><br>Adds a way to independently stop KRaft processes in cases where operators are running in combined mode (a controller and broker in the same node). Previously, you could only stop both. The command line for stopping Kafka nodes now includes a pair of optional and mutually exclusive parameters "[--process-role]" OR "[--node-id]" to use with ./bin/kafka-server-stop.sh.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-890%3A+Transactions+Server-Side+Defense">KIP-890 Transactions Server-Side Defense</a>:
</b><br>Another part of this KIP shipped, this time adding transaction verification preventing hanging transactions for consumer offset partitions.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-896%3A+Remove+old+client+protocol+API+versions+in+Kafka+4.0">KIP-896 Remove old client protocol API versions in Kafka 4.0</a>:
</b><br>KIP-896 marks all client request versions older than Apache Kafka 2.1 as deprecated, and introduces new metrics to monitor the presence of such requests. Support for these requests will be dropped in Apache Kafka 4.0.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-919%3A+Allow+AdminClient+to+Talk+Directly+with+the+KRaft+Controller+Quorum+and+add+Controller+Registration">KIP-919 Allow AdminClient to Talk Directly with the KRaft Controller Quorum and add Controller Registration</a>:
</b><br>Allows the AdminClient to talk directly with the KRaft Controller Quorum, which allows us to support operations like DESCRIBE_QUORUM and INCREMENTAL_ALTER_CONFIGS to dynamically change the log4j levels on a KRaft controller. This helps with debugging scenarios where other parts of the system are down.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=263429128">KIP-978 Allow dynamic reloading of certificates with different DN / SANs</a>:
</b><br>Allows configurability to prevent checks that ensure DN (Distinguished Name) and SAN (Subject Alternative Names) are the same between old and new keystores when they’re being reload. This ultimately allows dynamic reloading of certificates that have different DN/SANs.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-1001%3A+Add+CurrentControllerId+Metric">KIP-1001 Add CurrentControllerId Metric</a>:
</b><br>Adds a CurrentControllerId metric, allowing users to find the current controller by looking at the metrics of any Kafka broker/controller.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-938%3A+Add+more+metrics+for+measuring+KRaft+performance">KIP-938 Add more metrics for measuring KRaft performance</a>:
</b><br>We’ve added 11 new metrics for measuring KRaft-mode performance, including ActiveControllersCount, CurrentMetadataVersion and TimedOutBrokerHeartbeatCount.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=284789510">KIP-1013 Drop broker and tools support for Java 11 in Kafka 4.0 (deprecate in 3.7)</a>:
</b><br>Java 11 is now deprecated for all the server and tools modules - kafka-server-common, kafka-server, kafka_2.13, kafka-storage, kafka-metadata, kafka-group-coordinator, kafka-raft, kafka-shell, kafka-tools. It will not be supported after Kafka 4.0. All other modules (including clients, streams and connect) will continue to require Java 11 (as specified by <a href="https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=181308223">KIP-750</a>).
</li>
</ul>
<h3>Kafka Streams</h3>
<ul>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-925%3A+Rack+aware+task+assignment+in+Kafka+Streams">KIP-925 Rack aware task assignment in Kafka Streams</a>:
</b><br>In part one of KIP-925, the min_traffic assignment strategy for Kafka Streams was added. Part two finishes the KIP by introducing the second rack-aware assignment strategy: balanced_subtopology.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-954%3A+expand+default+DSL+store+configuration+to+custom+types">KIP-954 Expand default DSL store configuration to custom types</a>:
</b><br>KIP-954 builds on KIP-591 and allows users to provide a default state store provider for their custom stores. As part of this change, a new interface has been provided along with default support for RocksDB and in-memory state stores.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-962%3A+Relax+non-null+key+requirement+in+Kafka+Streams">KIP-962 Relax non-null key requirement in Kafka Streams</a>:
</b><br>Kafka Streams treated records with null-keys as invalid input for joins and dropped them on the floor. KIP-962 relaxes this behavior for various left-joins and thus allows null-key records to be processed successfully.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-988%3A+Streams+Standby+Update+Listener">KIP-988 Streams Standby Update Listener</a>:
</b><br>Adds a new interface for handling cases where standby tasks have their a) state stores registered, b) load a batch of records and c) stop updates.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-960%3A+Support+single-key_single-timestamp+interactive+queries+%28IQv2%29+for+versioned+state+stores">KIP-960</a> / <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-968%3A+Support+single-key_multi-timestamp+interactive+queries+%28IQv2%29+for+versioned+state+stores">KIP-968</a> IQ support for Versioned State Stores:
</b><br>Version state stores were added in Apache Kafka 3.5 release (KIP-889), but it was not possible so far to query the new stores. KIP-960 and KIP-968 close this gap by adding new query types for IQv2 namely VersionedKeyQuery and MultiVersionedKeyQuery, respectively. Both queries allow you to do lookups for a single key, to ask for the most recent value, a historic value, or a range of historic values for the provided key.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-985%3A+Add+reverseRange+and+reverseAll+query+over+kv-store+in+IQv2">KIP-985 Add reverseRange and reverseAll query over kv-store in IQv2</a>:
</b><br>IQv2 supports RangeQueries which allow you to query for a range of keys. However, the API did not provide any guarantee about the ordering of the returned result. With KIP-985 it’s now possible to request the result to be ordered (per partition) in either ascending or descending order, or leave the order unspecified.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-992%3A+Proposal+to+introduce+IQv2+Query+Types%3A+TimestampedKeyQuery+and+TimestampedRangeQuery">KIP-992 Introduce IQv2 Query Types: TimestampedKeyQuery and TimestampedRangeQuery</a>:
</b><br>Finally, KIP-992 adds new timestamped-key and timestamped-range interactive queries for timestamped key-value state stores. This change improves the type safety of the IQv2 API. The existing RangeQuery now always returns only the value if issued against a timestamped key-value store.
</li>
</ul>
<h3>Kafka Connect</h3>
<ul>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-976%3A+Cluster-wide+dynamic+log+adjustment+for+Kafka+Connect">KIP-976 Cluster-wide dynamic log adjustment for Kafka Connect</a>:
</b><br>KIP-495 introduced the ability for users to dynamically change the log level of individual workers in their connect cluster. To address situations when it is not possible to target an individual worker, KIP-976 allows for dynamic log-level changes to be broadcast to all workers across the cluster in a single update.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-980%3A+Allow+creating+connectors+in+a+stopped+state">KIP-980 Allow creating connectors in a stopped state</a>:
</b><br>This update allows users to create new Connectors in a STOPPED or PAUSED state, enabling use cases like migrating connectors. There is now a new optional "initial_state" field during connector creation.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-959%3A+Add+BooleanConverter+to+Kafka+Connect">KIP-959 Add BooleanConverter to Kafka Connect</a>:
</b><br>KIP-959 adds a BooleanConverter to Connect, supporting serializing and deserializing the boolean primitive in a Kafka Connect schema. This implements both org.apache.kafka.connect.storage.Converter and org.apache.kafka.connect.storage.HeaderConverter.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-970%3A+Deprecate+and+remove+Connect%27s+redundant+task+configurations+endpoint">KIP-970 Deprecate and remove Connect's redundant task configurations endpoint</a>:
</b><br>Deprecates a redundant endpoint for fetching task configurations, eventually to be removed in Apache Kafka 4.0.
</li>
</ul>
<h3>Summary</h3>
<p>Ready to get started with Apache Kafka 3.7.0? Check out all the details in the <a href="https://downloads.apache.org/kafka/3.7.0/RELEASE_NOTES.html">release notes</a> and <a href="https://kafka.apache.org/downloads">download</a> Apache Kafka 3.7.0.</p>
<p>This was a community effort, so thank you to everyone who contributed to this release, including all our users and our 146 contributors: <br>
Abhijeet Kumar, Akhilesh Chaganti, Alieh, Alieh Saeedi, Almog Gavra, Alok Thatikunta, Alyssa Huang, Aman Singh, Andras Katona, Andrew Schofield, Anna Sophie Blee-Goldman, Anton Agestam, Apoorv Mittal, Arnout Engelen, Arpit Goyal, Artem Livshits, Ashwin Pankaj, ashwinpankaj, atu-sharm, bachmanity1, Bob Barrett, Bruno Cadonna, Calvin Liu, Cerchie, chern, Chris Egerton, Christo Lolov, Colin Patrick McCabe, Colt McNealy, Crispin Bernier, David Arthur, David Jacot, David Mao, Deqi Hu, Dimitar Dimitrov, Divij Vaidya, Dongnuo Lyu, Eaugene Thomas, Eduwer Camacaro, Eike Thaden, Federico Valeri, Florin Akermann, Gantigmaa Selenge, Gaurav Narula, gongzhongqiang, Greg Harris, Guozhang Wang, Gyeongwon, Do, Hailey Ni, Hanyu Zheng, Hao Li, Hector Geraldino, hudeqi, Ian McDonald, Iblis Lin, Igor Soarez, iit2009060, Ismael Juma, Jakub Scholz, James Cheng, Jason Gustafson, Jay Wang, Jeff Kim, Jim Galasyn, John Roesler, Jorge Esteban Quilcate Otoya, Josep Prat, José Armando García Sancio, Jotaniya Jeel, Jouni Tenhunen, Jun Rao, Justine Olshan, Kamal Chandraprakash, Kirk True, kpatelatwork, kumarpritam863, Laglangyue, Levani Kokhreidze, Lianet Magrans, Liu Zeyu, Lucas Brutschy, Lucia Cerchie, Luke Chen, maniekes, Manikumar Reddy, mannoopj, Maros Orsak, Matthew de Detrich, Matthias J. Sax, Max Riedel, Mayank Shekhar Narula, Mehari Beyene, Michael Westerby, Mickael Maison, Nick Telford, Nikhil Ramakrishnan, Nikolay, Okada Haruki, olalamichelle, Omnia G.H Ibrahim, Owen Leung, Paolo Patierno, Philip Nee, Phuc-Hong-Tran, Proven Provenzano, Purshotam Chauhan, Qichao Chu, Matthias J. Sax, Rajini Sivaram, Renaldo Baur Filho, Ritika Reddy, Robert Wagner, Rohan, Ron Dagostino, Roon, runom, Ruslan Krivoshein, rykovsi, Sagar Rao, Said Boudjelda, Satish Duggana, shuoer86, Stanislav Kozlovski, Taher Ghaleb, Tang Yunzi, TapDang, Taras Ledkov, tkuramoto33, Tyler Bertrand, vamossagar12, Vedarth Sharma, Viktor Somogyi-Vass, Vincent Jiang, Walker Carlson, Wuzhengyu97, Xavier Léauté, Xiaobing Fang, yangy0000, Ritika Reddy, Yanming Zhou, Yash Mayya, yuyli, zhaohaidao, Zihao Lin, Ziming Deng
</p>
</article>
<article>
<h2 class="bullet">
<a id="apache_kafka_352_release_announcement"></a>
<a href="#apache_kafka_352_release_announcement">Apache Kafka 3.5.2 Release Announcement</a>
</h2>
11 December 2023 - Luke Chen (<a href="https://twitter.com/showuon1">@showuon1</a>)
<p>We are proud to announce the release of Apache Kafka 3.5.2. This is a bugfix release. It contains many bug fixes including upgrades the Snappy and Rocksdb dependencies. For a full list of changes, be sure to check the <a href="https://downloads.apache.org/kafka/3.5.2/RELEASE_NOTES.html">release notes</a>.</p>
<p>See the <a href="https://kafka.apache.org/documentation.html#upgrade_3_5_2">Upgrading to 3.5.2 from any version 0.8.x through 3.4.x</a> section in the documentation for the list of notable changes and detailed upgrade steps.</p>
<h3>Summary</h3>
<p>This was a community effort, so thank you to everyone who contributed to this release:</br>
A. Sophie Blee-Goldman, Anna Sophie Blee-Goldman, atu-sharm, bachmanity1, Bill Bejeck, Calvin Liu, Chase Thomas, Chris Egerton, Christo Lolov, Colin P. McCabe, Colin Patrick McCabe, David Arthur, David Jacot, Divij Vaidya, Farooq Qaiser, Federico Valeri, flashmouse, Florin Akermann, Greg Harris, Guozhang Wang, Hao Li, hudeqi, Ismael Juma, Jason Gustafson, José Armando García Sancio, Josep Prat, Levani Kokhreidze, lixy, Lucas Brutschy, Luke Chen, Manikumar Reddy, Matthias J. Sax, Mickael Maison, Nick Telford, Okada Haruki, Omnia G.H Ibrahim, Philip Nee, Qichao Chu (@ex172000), Mickael Maison, Rajini Sivaram, Ritika Reddy, Robert Wagner, Rohan, Ron Dagostino, Sagar Rao, Said Boudjelda, sciclon2, Viktor Somogyi-Vass, Vincent Jiang, Xiaobing Fang, Yash Mayya
</p>
</article>
<article>
<h2 class="bullet">
<a id="apache_kafka_361_release_announcement"></a>
<a href="#apache_kafka_361_release_announcement">Apache Kafka 3.6.1 Release Announcement</a>
</h2>
7 December 2023 - Mickael Maison (<a href="https://twitter.com/MickaelMaison">@MickaelMaison</a>)
<p>We are proud to announce the release of Apache Kafka 3.6.1. This is a bugfix release. It contains 30 fixes including upgrades to the ZooKeeper and Netty dependencies. For a full list of changes, be sure to check the <a href="https://archive.apache.org/dist/kafka/3.6.1/RELEASE_NOTES.html">release notes</a>.</p>
<p>See the <a href="https://kafka.apache.org/36/documentation.html#upgrade_3_6_1">Upgrading to 3.6.1 from any version 0.8.x through 3.5.x</a> section in the documentation for the list of notable changes and detailed upgrade steps.</p>
<h3>Summary</h3>
<p>This was a community effort, so thank you to everyone who contributed to this release:</br>
Anna Sophie Blee-Goldman, Arpit Goyal, atu-sharm, Bill Bejeck, Chris Egerton, Colin P. McCabe, David Arthur, David Jacot, Divij Vaidya, Federico Valeri, Greg Harris, Guozhang Wang, Hao Li, hudeqi, iit2009060, Ismael Juma, Jorge Esteban Quilcate Otoya, Josep Prat, Jotaniya Jeel, Justine Olshan, Kamal Chandraprakash, kumarpritam863, Levani Kokhreidze, Lucas Brutschy, Luke Chen, Manikumar Reddy, Matthias J. Sax, Mayank Shekhar Narula, Mickael Maison, Nick Telford, Philip Nee, Qichao Chu, Rajini Sivaram, Robert Wagner, Sagar Rao, Satish Duggana, Walker Carlson, Xiaobing Fang, Yash Mayya
</p>
</article>
<article>
<h2 class="bullet">
<a id="apache_kafka_360_release_announcement"></a>
<a href="#apache_kafka_360_release_announcement">Apache Kafka 3.6.0 Release Announcement</a>
</h2>
10 Oct 2023 - Satish Duggana (<a href="https://twitter.com/0xeed">@SatishDuggana</a>)
<p>We are proud to announce the release of Apache Kafka 3.6.0. This release contains many new features and improvements. This blog post will highlight some of the more prominent features. For a full list of changes, be sure to check the <a href="https://archive.apache.org/dist/kafka/3.6.0/RELEASE_NOTES.html">release notes</a>.</p>
<p>See the <a href="https://kafka.apache.org/36/documentation.html#upgrade_3_6_0">Upgrading to 3.6.0 from any version 0.8.x through 3.5.x</a> section in the documentation for the list of notable changes and detailed upgrade steps.</p>
<p>
The ability to migrate Kafka clusters from a ZooKeeper metadata system to a KRaft metadata system is
now ready for usage in production environments. See the ZooKeeper to KRaft migration
<a href="https://kafka.apache.org/documentation/#kraft_zk_migration">operations documentation</a> for
details. Note that support for JBOD is still not available for KRaft clusters, therefore clusters
utilizing JBOD can not be migrated. See <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-858%3A+Handle+JBOD+broker+disk+failure+in+KRaft">KIP-858</a>
for details regarding KRaft and JBOD.
</p>
<p>Support for Delegation Tokens in KRaft (<a href="https://issues.apache.org/jira/browse/KAFKA-15219">KAFKA-15219</a>) was completed in 3.6, further reducing the gap of features between ZooKeeper-based Kafka clusters and KRaft. Migration of delegation tokens from ZooKeeper to KRaft is also included in 3.6.</p>
<p><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-405%3A+Kafka+Tiered+Storage">Tiered Storage</a> is an early access feature. It is currently only suitable for testing in non production environments. See the <a href="https://cwiki.apache.org/confluence/display/KAFKA/Kafka+Tiered+Storage+Early+Access+Release+Notes">Early Access Release Notes</a> for more details.</p>
<p><i>Note: ZooKeeper is marked as deprecated since 3.5.0 release. ZooKeeper is planned to be removed in Apache Kafka 4.0. For more information, please see the documentation for <a href="/documentation#zk_depr">ZooKeeper Deprecation</a></i><p>
<h3>Kafka Broker, Controller, Producer, Consumer and Admin Client</h3>
<ul>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-405%3A+Kafka+Tiered+Storage">KIP-405</a>:
Kafka Tiered Storage (Early Access): </b><br>Introduces Tiered Storage to Kafka. Note that this
is an early access feature only advised for use in non-production environments (see the <a
href="https://cwiki.apache.org/confluence/display/KAFKA/Kafka+Tiered+Storage+Early+Access+Release+Notes">early
access notes</a> for more information). This feature provides a separation of computation
and storage in the broker for pluggable storage tiering natively in Kafka Tiered Storage brings
a seamless extension of storage to remote objects with minimal operational changes.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-890%3A+Transactions+Server-Side+Defense">KIP-890</a>:
Transactions Server Side Defense (Part 1): </b><br>Hanging transactions can negatively impact
your read committed consumers and prevent compacted logs from being compacted. KIP-890 helps
address hanging transactions by verifying partition additions. Part 2 of KIP-890 will optimize
verification, which currently adds an extra hop.<br>
In 3.6.0, transaction verification will prevent hanging transactions on data partitions. In the next release, transactional offset commits will also be covered.
</li>
<li><b><a
href="https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=195726330">KIP-797</a>:
Accept duplicate listener on port for IPv4/IPv6: </b><br>Until now, Kafka has not supported
duplicate listeners on the same port. This works when using only a single IP stack, but presents
an issue if you are working with both IPv4 and IPv6. With KIP-797, brokers can be configured
with listeners that have the same port on different IP stacks. This update does not affect
advertised listeners, which already have this feature.
</li>
<li><b><a
href="https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=225152035">KIP-863</a>:
Reduce CompletedFetch#parseRecord() memory copy: </b><br>Reduces memory allocation and improves
memory performance during record deserialization by using a ByteBuffer instead of byte[] for
deserialization, which improves efficiency. Updated public interfaces include the Deserializer
class, ByteBufferDeserializer class, and StringDeserializer class.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-868+Metadata+Transactions">KIP-868</a>:
Metadata Transactions: </b><br>Improves the overall durability of the KRaft layer by adding
metadata transactions that consist of:
<ul>
<li>BeginTransaction</li>
<li>Number of records</li>
<li>EndTransaction or AbortTransaction</li>
</ul>
KRaft uses record batches as a mechanism for atomicity. Typically, there was a limit to the
fetch size on the Raft consensus layer, and the controller could generate a set of atomic
records that exceeded this limit. This update introduces marker records that allow larger sets
of atomic records to be sent to the Raft consensus layer in multiple batches. This bypasses the
fetch limit.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-902%3A+Upgrade+Zookeeper+to+3.8.2">KIP-902</a>:
Upgrade Zookeeper to 3.8.2:</b><br>This upgrades the ZooKeeper version that is bundled with Kafka to
version 3.8.2. The new version includes several updates and security improvements.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-917%3A+Additional+custom+metadata+for+remote+log+segment">KIP-917</a>:
Additional custom metadata for remote log segment:</b><br> It introduces having an optional
custom metadata as part of remote log segment metadata. RemoteStorageManager returns the
optional custom metadata when copyLogSegmentData() is invoked. It will be passed along with
remote log segment metadata.
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-937%3A+Improve+Message+Timestamp+Validation">KIP-937</a>:
Improve Message Timestamp Validation: </b><br>It improves data integrity and prevents potential
pitfalls caused by inaccurate timestamp handling by adding more validation logic for message
timestamps. While past timestamps are a normal occurrence in Kafka, future timestamps might
represent an incorrectly formatted integer. KIP-937 rejects messages with future timestamps and
provides a descriptive exemption.
</li>
<li><b><a
href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-938%3A+Add+more+metrics+for+measuring+KRaft+performance">KIP-938</a>:
Add more metrics for measuring KRaft performance: </b><br>Adds new controller, loader, and snapshot emitter KRaft performance metrics.
</li>
</ul>
<h3>Kafka Streams</h3>
<ul>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-923%3A+Add+A+Grace+Period+to+Stream+Table+Join">KIP-923</a>: Add A Grace Period to Stream Table Join: </b><br>Adds a grace period to stream-table joins to improve table-side out-of-order data handling. The joined object has a new method called "withGracePeriod" that will cause the table side lookup to only happen after the grace period has passed.</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-941%3A+Range+queries+to+accept+null+lower+and+upper+bounds">KIP-941</a>: Range queries to accept null lower and upper bounds:</b><br>Previously, RangeQuery did not support null to specify “no upper/lower bound”.
KIP-941 allows users to pass null into withRange(...) for lower/upper bounds to specify a full or half-open range:
<ul>
<li>`withRange(null, null)` == `withNoBounds()`</li>
<li>`withRange(lower, null)` == `withLowerBound(lower)`</li>
<li>`withRange(null, upper)` == `withUpperBound(upper)`</li>
</ul>
</li>
</ul>
<h3>Kafka Connect</h3>
<ul>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-793%3A+Allow+sink+connectors+to+be+used+with+topic-mutating+SMTs">KIP-793</a>: Allow sink connectors to be used with topic-mutating SMTs: </b><br>Adds support for topic-mutating SMTs for async sink connectors. This is to address an incompatibility between sink connectors overriding the SinkTask::preCommit method and SMTs that mutate the topic field of a SinkRecord .</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-875%3A+First-class+offsets+support+in+Kafka+Connect">KIP-875</a>: First-class offsets support in Kafka Connect: </b><br>Provides first-class admin support for offsets in Kafka Connect. KIP-875 Part 1 added endpoints to get offsets and a new STOPPED state for connectors. The alter offsets and reset offsets endpoints have now been added.
<table>
<tr>
<th>Action</th>
<th>Description</th>
</tr>
<tr>
<td>GET /connectors/{connector}/offsets</td>
<td>Retrieve the offsets for a connector; the connector must exist</td>
</tr>
<tr>
<td>PATCH /connectors/{connector}/offsets</td>
<td>Alter the offsets for a connector; the connector must exist, and must be in the STOPPED state
</td>
</tr>
<tr>
<td>DELETE /connectors/{connector}/offsets</td>
<td>Reset the offsets for a connector; the connector must exist, and must be in the STOPPED state
</td>
</tr>
<tr>
<td>PUT /connectors/{connector}/pause</td>
<td>Pause the connector; the connector must exist</td>
</tr>
</table>
</li>
<li><b><a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-898%3A+Modernize+Connect+plugin+discovery">KIP-898</a>: Modernize Connect plugin discovery: </b><br>With KIP-898, Connect workers can now read from ServiceLoader manifests and module info directly during startup for more efficient plugin class discovery. Note that this update allows connector developers to add service declarations to their plugins.</li>
</ul>
<h3>Summary</h3>
<p>Ready to get started with Apache Kafka 3.6.0? Check out all the details in the <a href="https://archive.apache.org/dist/kafka/3.6.0/RELEASE_NOTES.html">release notes</a> and <a href="https://kafka.apache.org/downloads">download</a> Apache Kafka 3.6.0.</p>
<p>This was a community effort, so thank you to everyone who contributed to this release, including all our users and our 139 contributors: <br>
A. Sophie Blee-Goldman, Aaron Ai, Abhijeet Kumar, aindriu-aiven, Akhilesh Chaganti, Alexandre Dupriez, Alexandre Garnier, Alok Thatikunta, Alyssa Huang, Aman Singh, Andras Katona, Andrew Schofield, Andrew Grant, Aneel Kumar, Anton Agestam, Artem Livshits, atu-sharm, bachmanity1, Bill Bejeck, Bo Gao, Bruno Cadonna, Calvin Liu, Chaitanya Mukka, Chase Thomas, Cheryl Simmons, Chia-Ping Tsai, Chris Egerton, Christo Lolov, Clay Johnson, Colin P. McCabe, Colt McNealy, d00791190, Damon Xie, Danica Fine, Daniel Scanteianu, Daniel Urban, David Arthur, David Jacot, David Mao, dengziming, Deqi Hu, Dimitar Dimitrov, Divij Vaidya, DL1231, Dániel Urbán, Erik van Oosten, ezio, Farooq Qaiser, Federico Valeri, flashmouse, Florin Akermann, Gabriel Oliveira, Gantigmaa Selenge, Gaurav Narula, GeunJae Jeon, Greg Harris, Guozhang Wang, Hailey Ni, Hao Li, Hector Geraldino, hudeqi, hzh0425, Iblis Lin, iit2009060, Ismael Juma, Ivan Yurchenko, James Shaw, Jason Gustafson, Jeff Kim, Jim Galasyn, John Roesler, Joobi S B, Jorge Esteban Quilcate Otoya, Josep Prat, Joseph (Ting-Chou) Lin, José Armando García Sancio, Jun Rao, Justine Olshan, Kamal Chandraprakash, Keith Wall, Kirk True, Lianet Magrans, LinShunKang, Liu Zeyu, lixy, Lucas Bradstreet, Lucas Brutschy, Lucent-Wong, Lucia Cerchie, Luke Chen, Manikumar Reddy, Manyanda Chitimbo, Maros Orsak, Matthew de Detrich, Matthias J. Sax, maulin-vasavada, Max Riedel, Mehari Beyene, Michal Cabak (@miccab), Mickael Maison, Milind Mantri, minjian.cai, mojh7, Nikolay, Okada Haruki, Omnia G H Ibrahim, Owen Leung, Philip Nee, prasanthV, Proven Provenzano, Purshotam Chauhan, Qichao Chu, Rajini Sivaram, Randall Hauch, Renaldo Baur Filho, Ritika Reddy, Rittika Adhikari, Rohan, Ron Dagostino, Sagar Rao, Said Boudjelda, Sambhav Jain, Satish Duggana, sciclon2, Shekhar Rajak, Sungyun Hur, Sushant Mahajan, Tanay Karmarkar, tison, Tom Bentley, vamossagar12, Victoria Xia, Vincent Jiang, vveicc, Walker Carlson, Yash Mayya, Yi-Sheng Lien, Ziming Deng, 蓝士钦
</p>
</article>
<article>
<h2 class="bullet">
<a id="apache_kafka_351_release_announcement"></a>
<a href="#apache_kafka_351_release_announcement">Apache Kafka 3.5.1 Release Announcement</a>
</h2>
21 July 2023 - Divij Vaidya (<a href="https://twitter.com/divijvaidya">@DivijVaidya</a>)
<p>We are proud to announce the release of Apache Kafka 3.5.1. This is a security patch release. It upgrades the dependency, snappy-java, to a version which is not vulnerable to <a href="https://nvd.nist.gov/vuln/detail/CVE-2023-34455">CVE-2023-34455</a>. You can find more information about the CVE at <a href="https://kafka.apache.org/cve-list#CVE-2023-3445">Kafka CVE list</a>. For a full list of changes, be sure to check the <a href="https://archive.apache.org/dist/kafka/3.5.1/RELEASE_NOTES.html">release notes</a>.</p>
<p>See the <a href="https://kafka.apache.org/35/documentation.html#upgrade_3_5_1">Upgrading to 3.5.1 from any version 0.8.x through 3.4.x</a> section in the documentation for the list of notable changes and detailed upgrade steps.</p>
<h3>Kafka Broker, Controller, Producer, Consumer and Admin Client</h3>
<ul>
<li>
Upgraded the dependency, snappy-java, to a version which is not vulnerable to
<a href="https://nvd.nist.gov/vuln/detail/CVE-2023-34455">CVE-2023-34455.</a>
You can find more information about the CVE at <a href="https://kafka.apache.org/cve-list#CVE-2023-34455">Kafka CVE list.</a>
</li>
<li>
Fixed a regression introduced in 3.3.0, which caused <code>security.protocol</code> configuration values to be restricted to
upper case only. After the fix, <code>security.protocol</code> values are case insensitive.
See <a href="https://issues.apache.org/jira/browse/KAFKA-15053">KAFKA-15053</a> for details.
</li>
</ul>
<h3>Summary</h3>
<p>This was a community effort, so thank you to everyone who contributed to this release, including all our users and our 22 authors. Please report an unintended omission.
<p>Alyssa Huang, Aman Singh, andymg3, Bo Gao, Calvin Liu, Chia-Ping Tsai, Chris Egerton, d00791190, Damon Xie, David Arthur, David Jacot, Divij Vaidya, DL1231, ezio, Manikumar Reddy, Manyanda Chitimbo, Mickael Maison, minjian.cai, Proven Provenzano, Sambhav Jain, vamossagar12, Yash Mayya</p>
</p>
</article>
<article>
<h2 class="bullet">
<a id="apache_kafka_350_release_announcement"></a>
<a href="#apache_kafka_350_release_announcement">Apache Kafka 3.5.0 Release Announcement</a>
</h2>
15 June 2023 - Mickael Maison (<a href="https://twitter.com/MickaelMaison">@MickaelMaison</a>)
<p>We are proud to announce the release of Apache Kafka 3.5.0. This release contains many new features and improvements. This blog post will highlight some of the more prominent features. For a full list of changes, be sure to check the <a href="https://archive.apache.org/dist/kafka/3.5.0/RELEASE_NOTES.html">release notes</a>.</p>
<p>See the <a href="https://kafka.apache.org/35/documentation.html#upgrade_3_5_0">Upgrading to 3.5.0 from any version 0.8.x through 3.4.x</a> section in the documentation for the list of notable changes and detailed upgrade steps.</p>
<p>The ability to migrate Kafka clusters from ZK to KRaft mode with no downtime is still an early access feature. It is currently only suitable for testing in non production environments. See <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-866+ZooKeeper+to+KRaft+Migration">KIP-866</a> for more details.</p>
<p><it>Note: ZooKeeper is now marked deprecated in this release. ZooKeeper is planned to be removed in Apache Kafka 4.0. (Cf <a href="/documentation#zk_depr">ZooKeeper Deprecation</a>)</it><p>
<h3>Kafka Broker, Controller, Producer, Consumer and Admin Client</h3>
<ul>
<li><b>KIP-881: Rack-aware Partition Assignment for Kafka Consumers</b>: Kafka 3.4.0 only contained the protocol changes for <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-881%3A+Rack-aware+Partition+Assignment+for+Kafka+Consumers">KIP-881</a>. The built-in assignors have now been updated to support rack-awareness.</li>
<li><b>KIP-887: Add ConfigProvider to make use of environment variables</b>: <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-887%3A+Add+ConfigProvider+to+make+use+of+environment+variables">KIP-887</a> introduces a new <code><a href="https://kafka.apache.org/35/javadoc/org/apache/kafka/common/config/provider/ConfigProvider.html">ConfigProvider</a></code> implementation, <code>EnvVarConfigProvider</code>, to retrieve configurations from environment variables.</li>
<li><b>KIP-900: KRaft kafka-storage.sh API additions to support SCRAM for Kafka Brokers</b>: <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-900%3A+KRaft+kafka-storage.sh+API+additions+to+support+SCRAM+for+Kafka+Brokers">KIP-900</a> updates the <code>kafka-storage</code> tool and adds a mechanism to configure SCRAM for inter broker authentication with KRaft.</li>
<li><b>KIP-903: Replicas with stale broker epoch should not be allowed to join the ISR:</b> <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-903%3A+Replicas+with+stale+broker+epoch+should+not+be+allowed+to+join+the+ISR">KIP-903</a> addresses a limitation of the inter broker replication protocol which could lead to data loss in case of a broker failing while another broker had an unclean shutdown.</li>
</ul>
<h3>Kafka Streams</h3>
<ul>
<li><b>KIP-399: Extend ProductionExceptionHandler to cover serialization exceptions</b>: <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-399%3A+Extend+ProductionExceptionHandler+to+cover+serialization+exceptions">KIP-399</a> adds a method, <code>handleSerializationException()</code>, to the <code>ProductionExceptionHandler</code> interface to handle any serialization errors encountered while producing records.</li>
<li><b>KIP-889: Versioned State Stores</b>: <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-889%3A+Versioned+State+Stores">KIP-889</a> introduces versioned state stores to improve the accuracy of joins when out of order records are processed.</li>
<li><b>KIP-907: Add Boolean Serde to public interface</b>: Kafka Streams includes built-in Serdes for most primitive types. <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-907%3A+Add+Boolean+Serde+to+public+interface">KIP-907</a> adds a new one for booleans.</li>
</ul>
<h3>Kafka Connect</h3>
<ul>
<li><b>KIP-710: Full support for distributed mode in dedicated MirrorMaker 2.0 clusters</b>: <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-710%3A+Full+support+for+distributed+mode+in+dedicated+MirrorMaker+2.0+clusters">KIP-710</a> improves the dedicated mode of MirrorMaker. It now supports running multiple instances and handling automatic reconfigurations.</li>
<li><b>KIP-875: First-class offsets support in Kafka Connect</b>: <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-875%3A+First-class+offsets+support+in+Kafka+Connect">KIP-875</a> adds REST API endpoints for managing offset of Connectors. 3.5.0 only contains endpoints for listing offsets. Endpoints for updating and deleting offsets will come in a future release.</li>
<li><b>KIP-894: Use incrementalAlterConfig for syncing topic configurations</b>: With <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-894%3A+Use+incrementalAlterConfigs+API+for+syncing+topic+configurations">KIP-894</a>, MirrorMaker can use the <code>IncrementalAlterConfig</code> API when mirroring topic configuration between clusters.</li>
<li><b>KAFKA-14021: MirrorMaker 2 should implement KIP-618 APIs</b>: <a href="https://issues.apache.org/jira/browse/KAFKA-14021">KAFKA-14021</a> adds support for exactly-once semantics to MirrorSourceConnector.</li>
</ul>
<h3>Summary</h3>
<p>This was a community effort, so thank you to everyone who contributed to this release, including all our users and our 103 authors:
A. Sophie Blee-Goldman, Akhilesh Chaganti, Alex Sorokoumov, Alexandre Dupriez, Alyssa Huang, Anastasia Vela, Andreas Maechler, andymg3, Artem Livshits, atu-sharm, bachmanity1, Bill Bejeck, Brendan Ribera, Calvin Liu, Chaitanya Mukka, Cheryl Simmons, Chia-Ping Tsai, Chris Egerton, Christo Lolov, Colin P. McCabe, csolidum, Daniel Scanteianu, David Arthur, David Jacot, David Karlsson, David Mao, Dejan Stojadinović, Divij Vaidya, dorwi, drgnchan, Dániel Urbán, Edoardo Comar, egyedt, emilnkrastev, Eric Haag, Farooq Qaiser, Federico Valeri, Gantigmaa Selenge, Greg Harris, Guozhang Wang, Hao Li, Hector Geraldino, Himani Arora, Hoki Min, hudeqi, iamazy, Iblis Lin, Ismael Juma, Ivan Yurchenko, Jakub Scholz, Jason Gustafson, Jeff Kim, Jim Galasyn, Jorge Esteban Quilcate Otoya, Josep Prat, José Armando García Sancio, Juan José Ramos, Junyang Liu, Justine Olshan, Kamal Chandraprakash, Kirk True, Kowshik Prakasam, littlehorse-eng, liuzc9, Lucas Brutschy, Lucia Cerchie, Luke Chen, Manikumar Reddy, Manyanda Chitimbo, Matthew Wong, Matthias J. Sax, Matthias Seiler, Michael Marshall, Mickael Maison, nicolasguyomar, Nikolay, Paolo Patierno, Philip Nee, Pierangelo Di Pilato, Proven Provenzano, Purshotam Chauhan, Qing, Rajini Sivaram, RivenSun, Robert Young, Rohan, Roman Schmitz, Ron Dagostino, Ruslan Krivoshein, Satish Duggana, Shay Elkin, Shekhar Rajak, Simon Woodman, Spacrocket, stejani-cflt, Terry, Tom Bentley, vamossagar12, Victoria Xia, Viktor Somogyi-Vass, Vladimir Korenev, Yash Mayya, Zheng-Xian Li
</p>
</article>
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