Feature: Add Queue Multiplexing Scheduler#398
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Reviewed by Cursor Bugbot for commit df577aa. Configure here.
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Should this still be in draft? It doesn't look finished because it lacks working implementations for all drivers. |
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Summary
Deployments with tens of thousands of routes run one poll loop per runner, issuing O(routes x partitions) queries per tick against mostly empty partitions. This PR adds a single-loop scheduler that scans the backend for partitions with actionable work and runs only their owning units, activating them on demand and deactivating them when idle.
Note
Medium Risk
Touches core queue storage, runner pipe maintenance, and an automatic Postgres schema migration; scheduler misconfiguration or scan bugs could skip or hot-loop work at scale, though behavior is heavily test-covered.
Overview
Adds a single-loop
KeetaAnchorQueueSchedulerthat discovers partitions with actionable work via one backend scan, wakes owning schedulable units (notify, fast pass, recovery sweeps, idle deactivate), and caps per-iteration work so large backlogs do not starve other heads.Introduces optional
scanActivePathson queue storage (withKeetaAnchorQueueScanFilter) on the memory driver and PostgreSQL (plus driver tests for memory/file/postgres); Redis/SQLite/Firestore do not implement it yet. Postgres gets schema version 3 with a(status, path)index to support status-first scans, and path-prefixLIKEescaping for segments containing%/_.Centralizes partition keys via
EncodeQueuePath/ValidateQueuePartitionSegment(.in segment names rejected) across drivers. Failed stage moves now refreshupdatedwithout changing status/failures so time-bounded sweeps keep retrying pipes; batch idempotent conflicts refresh stranded members similarly.New
scheduler.test.tsand expanded queue tests cover scan behavior, partition validation, and move-refresh semantics.Reviewed by Cursor Bugbot for commit 783c4bc. Bugbot is set up for automated code reviews on this repo. Configure here.