Josh Kang c2b86f3ec0 Lazily allocate MultiGet coroutine scratch buffers (#15298) ...

Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/15298

## Summary

BlockBasedTable::MultiGetCoroutine() embedded the synchronous 8 KiB scratch buffer in every coroutine frame, including cache-hit requests. The change uses zero coroutine stack capacity and allocates the required heap size only when I/O is needed, while preserving synchronous behavior.

## Benchmarks

| Variant | Coroutine frame allocation |
| Before | 21,048 bytes |
| After | 12,864 bytes |
| Change | -8,184 bytes (-38.9%) |

No API, format, or read-result changes.

Reviewed By: xingbowang

Differential Revision: D122810207

fbshipit-source-id: 003a8349b8da72de2eca2e62fb9f7b3d8802baed

2026-10-02 20:17:30 -07:00

..

read_flow

Lazily allocate MultiGet coroutine scratch buffers (#15298)

2026-10-02 20:17:30 -07:00

stress_test

Persist fault injection logs and fail fast on expected-state trace writes (#14651)

2026-06-20 17:20:14 -07:00

write_flow

Add async WAL precreation

2026-05-15 10:59:47 -07:00

index.md

db_stress: document expected-state trace/replay contract (#14612)

2026-04-14 09:58:20 -07:00