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MINOR: Note that formatted storage directories are not forward-compatible #22429

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MINOR: Note that formatted storage directories are not forward-compatible #22429

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4 changes: 3 additions & 1 deletion core/src/main/scala/kafka/tools/StorageTool.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -336,7 +336,9 @@ object StorageTool extends Logging {
formatParser.addArgument("--release-version", "-r")
.action(store())
.help(s"The release version to use for the initial feature settings. The minimum is " +
s"${MetadataVersion.MINIMUM_VERSION}; the default is ${MetadataVersion.LATEST_PRODUCTION}")
s"${MetadataVersion.MINIMUM_VERSION}; the default is ${MetadataVersion.LATEST_PRODUCTION}. " +
s"Note: formatted directories are not forward-compatible — the broker version must be greater " +
s"than or equal to the kafka-storage tool that formatted the directory, regardless of this setting.")

formatParser.addArgument("--feature", "-f")
.help("The setting to use for a specific feature, in feature=level format. For example: `kraft.version=1`.")
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3 changes: 2 additions & 1 deletion docs/getting-started/upgrade.md
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Expand Up @@ -33,7 +33,8 @@ type: docs
### Notable changes in 4.4.0

* The `ClientQuotaCallback#updateClusterMetadata` method is deprecated and will be removed in Kafka 5.0. Custom implementations of `ClientQuotaCallback` no longer need to override this method, as a default no-op implementation is now provided. For further details, please refer to [KIP-1200](https://cwiki.apache.org/confluence/x/axBJFg).
* The in-memory keystores (used for PEM certificates) now use the default type provided by `KeyStore.getDefaultType()` instead of the hardcoded PKCS12 type.
* The in-memory keystores (used for PEM certificates) now use the default type provided by `KeyStore.getDefaultType()` instead of the hardcoded PKCS12 type.
* Storage directories formatted by the `kafka-storage` tool are no longer forward-compatible. A Kafka broker must be the same version as, or newer than, the `kafka-storage` tool that formatted its directory, regardless of the `--release-version` chosen at format time. For further details, please refer to [KIP-1170](https://cwiki.apache.org/confluence/x/ZYoEFQ).

## Upgrading to 4.3.0

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