stanislavkozlovski commented on code in PR #578:
URL: https://github.com/apache/kafka-site/pull/578#discussion_r1498945271
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blog.html:
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<!--#include virtual="includes/_nav.htm" -->
<div class="right">
<h1 class="content-title">Blog</h1>
+ <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>
+ 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/36/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>
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
+ </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.
+ </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 a <a
href="https://docs.docker.com/trusted-content/dsos-program/";>Sponsored OSS</a>
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>Remove old client protocol API versions in
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>
+ </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 got 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://archive.apache.org/dist/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>
Review Comment:
TIL, thanks; fixed
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