Harden control plane connection management and optimize worker initialization#228
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fuziontech merged 3 commits intomainfrom Feb 18, 2026
Merged
Harden control plane connection management and optimize worker initialization#228fuziontech merged 3 commits intomainfrom
fuziontech merged 3 commits intomainfrom
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…lization Resolved Fivetran job failures caused by worker initialization timeouts and resource contention during concurrent "ATTACH" operations. Key improvements: - Worker Reusability: Workers are now pooled and reused across sequential sessions, avoiding the overhead of spawning a new process for every connection. Idle workers are reaped after a configurable 5-minute timeout. - Shared Worker State: All sessions within a worker process now share a single sql.DB instance (with dedicated sql.Conn for isolation). This allows sessions to share pre-loaded extensions and attached DuckLake catalogs, making subsequent session creation near-instant. - Background Pre-warming: Workers now perform full DuckDB initialization (loading extensions, attaching catalogs) at startup in the background. This ensures workers are "warm" and ready to serve before handling their first client request. - Parallel Spawning: Pre-warmed workers are spawned in parallel to accelerate control-plane startup. - Configuration: Added 'worker_idle_timeout' (default 5m) to duckgres.yaml and CLI flags. These changes eliminate the "spawn storms" observed under heavy load and ensure that client connections receive a 'ReadyForQuery' response within milliseconds after authentication.
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Resolved Fivetran job failures caused by worker initialization timeouts and resource contention during concurrent "ATTACH" operations.
Key improvements:
These changes eliminate the "spawn storms" observed under heavy load and ensure that client connections receive a 'ReadyForQuery' response within milliseconds after authentication.