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e57f8c4d87
The GET/HEAD handler read the needle synchronously on the tokio worker while holding store.read(): first a stream-info read that loaded the whole record just to parse its meta, then, for every needle that was not streamed (small, compressed, chunk manifest, image ops), a second full read. For a tiered volume each read is an S3 GET under the store lock, and a writer queued behind it parks every other store reader. The regular-volume read now runs in spawn_blocking. Under the store guard it only resolves a NeedleReadPlan (index lookup, a freshly opened .dat handle or the remote backend, offset, size); the guard is dropped before any needle data I/O. No data-file lease is held across the read either, since a writer waits for one while holding the store write lock. The index size decides the read, as in Go's readNeedle: a HEAD, a ranged read or a needle above the stream threshold reads only its header and meta tail (ReadNeedleMeta) and hands off to StreamingBody or the range path; everything else is read in full once, with its checksum verified. A compressed or manifest needle found by the meta read is then read in full once. The range-from-source read also moves to spawn_blocking. Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com>