KIP-770 — Replace "buffered.records.per.partition" & "cache.max.bytes.buffering" with "{statestore.cache}/{input.buffer}.max.bytes"

Discussion Kafka 3.4 Streams

Deprecates buffered.records.per.partition in favor of input.buffer.max.bytes (a global byte budget distributed evenly across stream threads) and renames cache.max.bytes.buffering to statestore.cache.max.bytes. The per-partition record count limit is scale-dependent and record-size-agnostic, making it impossible to reliably bound memory consumption across diverse workloads.

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