Chris LuandClaude Opus 5.5 55f1e1efc5 vector: cache reads of write-once Lance files across requests (#12303) ...

* lance worker: let dataset::open take an object store wrapper

open_with is open with the dataset's object store wrapped, so a caller
such as weed-vector can put a read cache in front of the table's files.
open keeps its signature and opens unwrapped, as before.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011UpvafvK8JpagF94MHWqwK

* vector: cache reads of write-once Lance files across requests

Every VectorService call opens the table afresh, and Lance keeps no
data pages between opens, so each QueryVectors re-read the whole
vector column through the S3 gateway: 83 MB and about 228 range GETs
per query at 50k x 384. The gateway and volume server spent their CPU
streaming it and throughput stayed at 6-8 queries/s whatever the
client concurrency.

weed-vector now wraps each table's object store with a bounded
in-memory cache (--read-cache-mb, 512 MiB by default, 0 disables). It
only serves data files, deletion files and index files: Lance writes
each once under a fresh random name, so a cached read cannot go stale,
even when an index is dropped and recreated at the same location.
Manifests, tags and every other path still go to the store, and each
call still describes the table, loads the latest version and takes
the query lease, so reads see every write committed before them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011UpvafvK8JpagF94MHWqwK

* vector: cache an owned copy of each fetched read

A range from get_ranges can be a slice of a larger response buffer,
such as a coalesced fetch, and caching the slice kept the whole buffer
alive while the weigher counted only the slice. The cache now copies
each fetched range and whole-object read into its own buffer, so
--read-cache-mb bounds what it actually holds.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011UpvafvK8JpagF94MHWqwK

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

2026-11-01 12:59:47 -08:00

..

crates

vector: cache reads of write-once Lance files across requests (#12303)

2026-11-01 12:59:47 -08:00

Cargo.lock

vector: cache reads of write-once Lance files across requests (#12303)

2026-11-01 12:59:47 -08:00

Cargo.toml

vector: weed-vector registers to master; s3 discovers it there (#12146)

2026-10-28 00:58:31 -07:00