KnowForgeCompatibility
qianmoQ· 更新于 2026-10-19· 阅读 8 分钟· 0 次阅读You are viewing documentation for an older version (4.2) of Kafka. For up-to-date documentation, see the latest version.
Compatibility
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.
JDK Compatibility Across Kafka Versions
| Module | Kafka Version | Java 11 | Java 17 | Java 23 |
|---|---|---|---|---|
| Clients | 4.0.0 | ✅ | ✅ | ✅ |
| Streams | 4.0.0 | ✅ | ✅ | ✅ |
| Connect | 4.0.0 | ❌ | ✅ | ✅ |
| Server | 4.0.0 | ❌ | ✅ | ✅ |
Note: Java 8 is removed in Kafka 4.0 and is no longer supported.
Server Compatibility
| KRaft Cluster Version | Compatibility 4.0 Server (dynamic voter) | Compatibility 4.0 Server (static voter) |
|---|---|---|
| before 3.2.x | ❌ | ❌ |
| 3.3.x | ❌ | ✅ |
| 3.4.x | ❌ | ✅ |
| 3.5.x | ❌ | ✅ |
| 3.6.x | ❌ | ✅ |
| 3.7.x | ❌ | ✅ |
| 3.8.x | ❌ | ✅ |
| 3.9.x | ✅ | ✅ |
| 4.0.x | ✅ | ✅ |
Note: Can’t upgrade server from static voter to dynamic voter, see KAFKA-16538.
Client/Broker Forward Compatibility
| Kafka Version | Module | Compatibility with Kafka 4.0 | Key Differences/Limitations |
|---|---|---|---|
| 0.x, 1.x, 2.0 | Client | ❌ Not Compatible | Pre-0.10.x protocols are fully removed in Kafka 4.0 (KIP-896). |
| Streams | ❌ Not Compatible | Pre-0.10.x protocols are fully removed in Kafka 4.0 (KIP-896). | |
| Connect | ❌ Not Compatible | Pre-0.10.x protocols are fully removed in Kafka 4.0 (KIP-896). | |
| 2.1 ~ 2.8 | Client | ⚠️ Partially Compatible | More details in the Consumer, Producer, and Admin Client section. |
| Streams | ⚠️ Limited Compatibility | More details in the Kafka Streams section. | |
| Connect | ⚠️ Limited Compatibility | More details in the Connect section. | |
| 3.x | Client | ✅ Fully Compatible | — |
| Streams | ✅ Fully Compatible | — | |
| Connect | ✅ Fully Compatible | — |
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.
Last modified February 16, 2026: Add 4.2 documentation and javadocs (devlive-community/knowforge#785) (956020bebd)
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