m1a2st commented on code in PR #18091: URL: https://github.com/apache/kafka/pull/18091#discussion_r1989425716
########## docs/compatibility.html: ########## @@ -0,0 +1,225 @@ +<!-- + Licensed to the Apache Software Foundation (ASF) under one or more + contributor license agreements. See the NOTICE file distributed with + this work for additional information regarding copyright ownership. + The ASF licenses this file to You under the Apache License, Version 2.0 + (the "License"); you may not use this file except in compliance with + the License. You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +--> + +<!--#include virtual="../includes/_header.htm" --> +<!--#include virtual="../includes/_top.htm" --> +<div class="content"> + <div class="p-compatibility"> + <h1>Compatibility</h1> + With the release of Kafka 4.0, significant changes have been introduced that impact compatibility across various + components. To assist users in planning upgrades and ensuring seamless interoperability, a comprehensive + compatibility matrix has been prepared. + <h2 class="anchor-heading">JDK Compatibility Across Kafka Versions</h2> + <table> + <tr> + <th>Module</th> + <th>Kafka Version</th> + <th>Java 11</th> + <th>Java 17</th> + <th>Java 23</th> + </tr> + <tr> + <td>Clients</td> + <td>4.0.0</td> + <td>✅</td> + <td>✅</td> + <td>✅</td> + </tr> + <tr> + <td>Streams</td> + <td>4.0.0</td> + <td>✅</td> + <td>✅</td> + <td>✅</td> + </tr> + <tr> + <td>Connect</td> + <td>4.0.0</td> + <td>❌</td> + <td>✅</td> + <td>✅</td> + </tr> + <tr> + <td>Server</td> + <td>4.0.0</td> + <td>❌</td> + <td>✅</td> + <td>✅</td> + </tr> + </table> + <p><strong>Note: Java 8 is deprecated in Kafka 4.0 and is no longer supported.</strong></p> + + <h2 class="anchor-heading">Server Compatibility</h2> + <table> + <tr> + <th>KRaft Cluster Version</th> + <th>Compatibility 4.0 Server (dynamic voter)</th> + <th>Compatibility 4.0 Server (static voter)</th> + </tr> + <tr> + <td>before 3.2.x</td> + <td>❌</td> + <td>❌</td> + </tr> + <tr> + <td>3.3.x</td> + <td>❌</td> + <td>✅</td> + </tr> + <tr> + <td>3.4.x</td> + <td>❌</td> + <td>✅</td> + </tr> + <tr> + <td>3.5.x</td> + <td>❌</td> + <td>✅</td> + </tr> + <tr> + <td>3.6.x</td> + <td>❌</td> + <td>✅</td> + </tr> + <tr> + <td>3.7.x</td> + <td>❌</td> + <td>✅</td> + </tr> + <tr> + <td>3.8.x</td> + <td>❌</td> + <td>✅</td> + </tr> + <tr> + <td>3.9.x</td> + <td>✅</td> + <td>✅</td> + </tr> + <tr> + <td>4.0.x</td> + <td>✅</td> + <td>✅</td> + </tr> + </table> + <p><strong>Note: Can’t upgrade server from static voter to dynamic + voter, see <a href="https://issues.apache.org/jira/browse/KAFKA-16538";>KAFKA-16538</a>.</strong></p> + + <h4>Client/Broker Forward Compatibility</h4> + <table> + <tr> + <th>Kafka Version</th> + <th>Module</th> + <th>Compatibility with Kafka 4.0</th> + <th>Key Differences/Limitations</th> + </tr> + <tr> + <td rowspan="3">0.x</td> + <td>Client</td> + <td>❌ Not Compatible</td> + <td>Pre-0.10.x protocols are fully removed in Kafka 4.0 (<a + href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-896";>KIP-896</a>). + </td> + </tr> + <tr> + <td>Streams</td> + <td>❌ Not Compatible</td> + <td>Kafka Streams introduced in Kafka 0.10.x.</td> + </tr> + <tr> + <td>Connect</td> + <td>❌ Not Compatible</td> + <td>Pre-0.10.x protocols are fully removed in Kafka 4.0 (<a + href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-896";>KIP-896</a>). + </td> + </tr> + <tr> + <td rowspan="3">1.x</td> + <td>Client</td> + <td>⚠️ Limited Compatibility</td> + <td>Does not support newer features like idempotent producer or transactional API.</td> + </tr> + <tr> + <td>Streams</td> + <td>⚠️ Limited Compatibility</td> + <td>Basic Streams features available. EOSv1 and eager rebalancing unavailable in Kafka 4.0.</td> + </tr> + <tr> + <td>Connect</td> + <td>⚠️ Limited Compatibility</td> + <td>IncrementalAlterConfigs not supported before Kafka 2.3.x.</td> + </tr> + <tr> + <td rowspan="3">2.x</td> + <td>Client</td> + <td>⚠️ Partially Compatible</td> + <td> + Multiple Admin API methods removed/renamed: alterConfigs → incrementalAlterConfigs<br> + UniformStickyPartitioner removed + </td> + </tr> + <tr> + <td>Streams</td> + <td>⚠️ Limited Compatibility</td> + <td> + EOSv1 and eager rebalancing unavailable in Kafka 4.0.<br> Review Comment: Maybe I should link `/documentation/#upgrade_400_notable` to this section -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
