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Brokers will be able to process requests containing partitions from both classic and new diskless topics in the same batch. When responding to these mixed-typed requests, the broker will be delayed until the diskless partitions are committed.

Append latency is broadly composed by:
- Buffering: up to 250ms or 8MiB (both configurable)
- Upload to Remote Storage: P99 ~200-400ms, P50 ~100ms
- Batch Coordinates Commit: P99 ~20-50ms, P50 ~10ms (depending on the number of batches)

We are aiming for a Produce request latency of P50 ~500ms P99 ~1-2 sec

Error handling and segment object garbage collection

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