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KAFKA-12570: Document compact arrays in flexible versions #22862

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KAFKA-12570: Document compact arrays in flexible versions #22862

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2 changes: 2 additions & 0 deletions docs/design/protocol.md
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Expand Up @@ -136,6 +136,8 @@ For interoperability with 0.9.0.x clients, the first packet received by the serv

The protocol is built out of the following primitive types.

Message versions marked as flexible use the compact encoding for variable-length fields. In particular, arrays use `COMPACT_ARRAY` rather than `ARRAY`; strings and byte arrays similarly use their corresponding `COMPACT_*` types. Compact encodings store their length as an unsigned variable-length integer instead of a fixed-width integer. Flexible versions also include a tagged-fields section at the end of every request and response component.

{{< include-html file="/static/{version}/generated/protocol_types.html" >}}

### Notes on reading the request format grammars
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