mirror of https://github.com/apache/kafka.git
MINOR: Update docs to point to next release add notable features for 2.7 (#9483)
Reviewers: Matthias J. Sax <mjsax@apache.org>
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Bill Bejeck
GitHub
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<div class="right">
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<!--#include virtual="../includes/_docs_banner.htm" -->
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<h1>Documentation</h1>
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<h3>Kafka 2.6 Documentation</h3>
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Prior releases: <a href="/07/documentation.html">0.7.x</a>, <a href="/08/documentation.html">0.8.0</a>, <a href="/081/documentation.html">0.8.1.X</a>, <a href="/082/documentation.html">0.8.2.X</a>, <a href="/090/documentation.html">0.9.0.X</a>, <a href="/0100/documentation.html">0.10.0.X</a>, <a href="/0101/documentation.html">0.10.1.X</a>, <a href="/0102/documentation.html">0.10.2.X</a>, <a href="/0110/documentation.html">0.11.0.X</a>, <a href="/10/documentation.html">1.0.X</a>, <a href="/11/documentation.html">1.1.X</a>, <a href="/20/documentation.html">2.0.X</a>, <a href="/21/documentation.html">2.1.X</a>, <a href="/22/documentation.html">2.2.X</a>, <a href="/23/documentation.html">2.3.X</a>, <a href="/24/documentation.html">2.4.X</a>, <a href="/25/documentation.html">2.5.X</a>.
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<h3>Kafka 2.8 Documentation</h3>
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Prior releases: <a href="/07/documentation.html">0.7.x</a>, <a href="/08/documentation.html">0.8.0</a>, <a href="/081/documentation.html">0.8.1.X</a>, <a href="/082/documentation.html">0.8.2.X</a>, <a href="/090/documentation.html">0.9.0.X</a>, <a href="/0100/documentation.html">0.10.0.X</a>, <a href="/0101/documentation.html">0.10.1.X</a>, <a href="/0102/documentation.html">0.10.2.X</a>, <a href="/0110/documentation.html">0.11.0.X</a>, <a href="/10/documentation.html">1.0.X</a>, <a href="/11/documentation.html">1.1.X</a>, <a href="/20/documentation.html">2.0.X</a>, <a href="/21/documentation.html">2.1.X</a>, <a href="/22/documentation.html">2.2.X</a>, <a href="/23/documentation.html">2.3.X</a>, <a href="/24/documentation.html">2.4.X</a>, <a href="/25/documentation.html">2.5.X</a>, <a href="/26/documentation.html">2.6.X</a>, <a href="/27/documentation.html">2.7.X</a>.
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<!--#include virtual="toc.html" -->
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<script id="upgrade-template" type="text/x-handlebars-template">
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<h5><a id="upgrade_280_notable" href="#upgrade_280_notable">Notable changes in 2.8.0</a></h5>
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<h5><a id="upgrade_270_notable" href="#upgrade_270_notable">Notable changes in 2.7.0</a></h5>
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<ul>
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<li>The configuration parameter <code>retries</code> is deprecated for the Kafka Streams client
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via <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-572%3A+Improve+timeouts+and+retries+in+Kafka+Streams">KIP-572</a>.
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You should use the new <code>task.timeout.ms</code> parameters instead.
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Note that parameter <code>retry.backoff.ms</code> is not impacted by this change.
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<li>
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The 2.7.0 release includes the core Raft implementation specified in
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<a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-595%3A+A+Raft+Protocol+for+the+Metadata+Quorum">KIP-595</a>.
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There is a separate "raft" module containing most of the logic. Until integration with the
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controller is complete, there is a standalone server that users can use for testing the p
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erformance of the Raft implementation. See the README.md in the raft module for details
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</li>
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<li>
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KIP-651 <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-651+-+Support+PEM+format+for+SSL+certificates+and+private+key">adds support</a>
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for using PEM files for key and trust stores.
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</li>
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<li>
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KIP-612 <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-612%3A+Ability+to+Limit+Connection+Creation+Rate+on+Brokers">adds support</a>
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for enforcing broker-wide and per-listener connection create rates. The 2.7.0 release contains
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the first part of KIP-612 with dynamic configuration coming in the 2.8.0 release.
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</li>
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<li>
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The ability to throttle topic and partition creations or
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topics deletions to prevent a cluster from being harmed via
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<a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-599%3A+Throttle+Create+Topic%2C+Create+Partition+and+Delete+Topic+Operations">KIP-599</a>
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</li>
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<li>
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The addition of <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-554%3A+Add+Broker-side+SCRAM+Config+API">KIP-554</a>
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continues progress towards the goal of Zookeeper removal from Kafka. The addition of KIP-554
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means you don't have to connect directly to ZooKeeper anymore for managing SCRAM credentials.
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</li>
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<li>Altering non-reconfigurable configs of existent listeners causes <code>InvalidRequestException</code>.
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By contrast, the previous (unintended) behavior would have caused the updated configuration to be persisted, but it wouldn't
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By contrast, the previous (unintended) behavior would have caused the updated configuration to be persisted,
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but it wouldn't
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take effect until the broker was restarted. See <a href="https://github.com/apache/kafka/pull/9284">KAFKA-10479</a> for more discussion.
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See <code>DynamicBrokerConfig.DynamicSecurityConfigs</code> and <code>SocketServer.ListenerReconfigurableConfigs</code>
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for the supported reconfigurable configs of existent listeners.
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</li>
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<li>
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Kafka Streams adds support for
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<a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-450%3A+Sliding+Window+Aggregations+in+the+DSL">Sliding Windows Aggregations</a>
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in the KStreams DSL.
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</li>
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<li>
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Reverse iteration over state stores enabling more efficient most recent update searches with
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<a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-617%3A+Allow+Kafka+Streams+State+Stores+to+be+iterated+backwards">KIP-617</a>
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</li>
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<li>
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End-to-End latency metrics in Kafka Steams see
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<a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-613%3A+Add+end-to-end+latency+metrics+to+Streams">KIP-613</a>
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for more details
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</li>
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<li>
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Kafka Streams added metrics reporting default RocksDB properties with
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<a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-607%3A+Add+Metrics+to+Kafka+Streams+to+Report+Properties+of+RocksDB">KIP-607</a>
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</li>
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<li>
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Better Scala implicit Serdes support from
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<a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-616%3A+Rename+implicit+Serdes+instances+in+kafka-streams-scala">KIP-616</a>
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</li>
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</ul>
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<h5><a id="upgrade_260_notable" href="#upgrade_260_notable">Notable changes in 2.6.0</a></h5>
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