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Chris LuandDevin
8379ee9251
* vector: version-lease helpers + maintenance safety tests Pinned queries must survive Lance maintenance. maintenance::pin tags the current dataset version so cleanup refuses to reclaim it; release drops the tag. Tests prove the P2 gate: a pinned query returns identical hits across compact_files, a tagged version survives cleanup_old_versions (error_if_tagged protects it, the non-strict run skips it), and a missing data file fails the query instead of returning partial hits. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * vector: lease the query's dataset version in the VectorService query_vectors pins the resolved version with a query tag for the duration of the RPC and releases it after, so concurrent maintenance cleanup cannot reclaim the files out from under an in-flight read. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * vector: release the version lease on every query exit path The lease tag was only released on query_vectors' success path — get_vectors never released and query_vectors leaked its tag on early returns. pin now returns a guard whose drop deletes the tag, so every path frees the version. * vector: unique lease tag names + reap abandoned leases Nanos-since-epoch tag names can collide across concurrent readers and processes, so each lease now carries a unique suffix. pin() also drops query tags older than an hour, since a killed or cancelled request leaves its lease behind and would otherwise block cleanup forever. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * vector: keep live lease tags + throttle abandoned-lease scans An expired tag is only reaped once no live lease in this process owns it, so a query running past LEASE_TTL keeps its pin. Tag scans run at most once per 60s per dataset instead of on every request. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * vector: answer read-only queries without a version lease A namespace may hand the server credentials that can read a table but not update it, so the tag write in pin() fails and the whole query errors out. try_pin() degrades a denied tag write to an unleased query instead of failing the request. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * vector: fail a lease whose pinned version is already gone Cleanup lists tags once at the start, so a tag created mid-cleanup does not protect the version it names. After the tag lands, pin now verifies the version still exists and drops the lease when it does not, failing the read at pin time instead of mid-query. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> --------- Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>