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MINOR: Fix the Client/Broker Forward Compatibility table in compatibility page (#21209)
The formatting of this table is currently incorrect. <img width="885" height="808" alt="image" src="https://github.com/user-attachments/assets/6ee71dde-0d3d-44d3-8e82-49b5ab922f64" /> The following snapshot is for this patch. <img width="991" height="656" alt="image" src="https://github.com/user-attachments/assets/b9958eb0-0a73-47b4-99dd-359efaa60d08" /> Reviewers: Chia-Ping Tsai <chia7712@gmail.com>
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‎docs/getting-started/compatibility.md‎

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✅
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</td> </tr> </table>
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**Note: Can’t upgrade server from static voter to dynamic voter, see[KAFKA-16538](https://issues.apache.org/jira/browse/KAFKA-16538).**
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**Note: Can’t upgrade server from static voter to dynamic voter, see [KAFKA-16538](https://issues.apache.org/jira/browse/KAFKA-16538).**
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## Client/Broker Forward Compatibility
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<table>
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<tr>
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<th>
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Kafka Version
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</th>
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<th>
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Module
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</th>
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<th>
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Compatibility with Kafka 4.0
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</th>
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<th>
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Key Differences/Limitations
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</th> </tr>
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<tr>
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<td>
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0.x, 1.x, 2.0
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</td>
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<td>
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Client
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</td>
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<td>
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❌ Not Compatible
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</td>
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<td>
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Pre-0.10.x protocols are fully removed in Kafka 4.0 ([KIP-896](https://cwiki.apache.org/confluence/x/K5sODg)).
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</td> </tr>
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<tr>
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<td>
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Streams
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</td>
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<td>
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❌ Not Compatible
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</td>
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<td>
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Pre-0.10.x protocols are fully removed in Kafka 4.0 ([KIP-896](https://cwiki.apache.org/confluence/x/K5sODg)).
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</td> </tr>
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<tr>
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<td>
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Connect
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</td>
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<td>
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❌ Not Compatible
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</td>
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<td>
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Pre-0.10.x protocols are fully removed in Kafka 4.0 ([KIP-896](https://cwiki.apache.org/confluence/x/K5sODg)).
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</td> </tr>
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<tr>
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<td>
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2.1 ~ 2.8
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</td>
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<td>
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Client
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</td>
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<td>
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⚠️ Partially Compatible
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</td>
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<td>
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More details in the [Consumer](/40/documentation.html#upgrade_400_notable_consumer), [Producer](/40/documentation.html#upgrade_400_notable_producer), and [Admin Client](/40/documentation.html#upgrade_400_notable_admin_client) section.
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</td> </tr>
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<tr>
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<td>
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Streams
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</td>
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<td>
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⚠️ Limited Compatibility
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</td>
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<td>
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More details in the [Kafka Streams](/40/documentation.html#upgrade_400_notable_kafka_streams) section.
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</td> </tr>
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<tr>
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<td>
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Connect
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</td>
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<td>
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⚠️ Limited Compatibility
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</td>
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<td>
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More details in the [Connect](/40/documentation.html#upgrade_400_notable_connect) section.
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</td> </tr>
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<tr>
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<td>
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3.x
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</td>
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<td>
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Client
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</td>
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<td>
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✅ Fully Compatible
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</td>
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</td> </tr>
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<td>
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Streams
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</td>
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<td>
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✅ Fully Compatible
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</td>
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</td> </tr>
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Connect
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</td>
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✅ Fully Compatible
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</td>
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</td> </tr> </table>
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<table>
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<tr>
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<th>Kafka Version</th>
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<th>Module</th>
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<th>Compatibility with Kafka 4.0</th>
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<th>Key Differences/Limitations</th>
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</tr>
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<tr>
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<td rowspan="3">0.x, 1.x, 2.0</td>
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<td>Client</td>
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<td>❌ Not Compatible</td>
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<td>
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Pre-0.10.x protocols are fully removed in Kafka 4.0 ([KIP-896](https://cwiki.apache.org/confluence/x/K5sODg)).
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</td>
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</tr>
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<tr>
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<td>Streams</td>
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<td>❌ Not Compatible</td>
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<td>
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Pre-0.10.x protocols are fully removed in Kafka 4.0 ([KIP-896](https://cwiki.apache.org/confluence/x/K5sODg)).</td>
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</tr>
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<tr>
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<td>Connect</td>
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<td>❌ Not Compatible</td>
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<td>
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Pre-0.10.x protocols are fully removed in Kafka 4.0 ([KIP-896](https://cwiki.apache.org/confluence/x/K5sODg)).</td>
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</tr>
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<tr>
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<td rowspan="3">2.1 ~ 2.8</td>
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<td>Client</td>
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<td>⚠️ Partially Compatible</td>
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<td>
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More details in the [Consumer](/40/documentation.html#upgrade_400_notable_consumer), [Producer](/40/documentation.html#upgrade_400_notable_producer), and [Admin Client](/40/documentation.html#upgrade_400_notable_admin_client) section.</td>
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</tr>
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<tr>
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<td>Streams</td>
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<td>⚠️ Limited Compatibility</td>
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<td>
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More details in the [Kafka Streams](/40/documentation.html#upgrade_400_notable_kafka_streams) section.</td>
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</tr>
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<tr>
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<td>Connect</td>
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<td>⚠️ Limited Compatibility</td>
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<td>
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More details in the [Connect](/40/documentation.html#upgrade_400_notable_connect) section.</td>
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</tr>
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<tr>
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<td rowspan="3">3.x</td>
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<td>Client</td>
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<td>✅ Fully Compatible</td>
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<td>—</td>
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</tr>
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<tr>
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<td>Streams</td>
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<td>✅ Fully Compatible</td>
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<td>—</td>
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</tr>
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<tr>
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<td>Connect</td>
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<td>✅ Fully Compatible</td>
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<td>—</td>
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</tr>
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</table>
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Note: Starting with Kafka 4.0, the `--zookeeper` option in AdminClient commands has been removed. Users must use the `--bootstrap-server` option to interact with the Kafka cluster. This change aligns with the transition to KRaft mode.

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