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Allow multiple queries to be sent on the wire before waiting for responses, reducing round-trip latency. Enabled via client.pipelining = true. Each query gets its own Sync boundary so errors are isolated. Tracks in-flight named statements (submittedNamedStatements) to prevent duplicate Parse messages when pipelining queries with the same prepared statement name. Handles error/disconnect cleanup for the sent queue.
- Clean up submittedNamedStatements on error in _handleErrorMessage to prevent stale entries from blocking future re-preparation of the same named statement after a parse failure - Guard _pulsePipelinedQueryQueue against non-queryable connections - Fix cancel() and readTimeout for sent queries: removing an already-sent query from _sentQueryQueue corrupts the pipeline response mapping since the server will still respond to it; no-op the callback instead - Add bench-pipelining.js comparing serial vs pipelined throughput
Gate _sentQueryQueue activation on readyForQuery=true inside _pulsePipelinedQueryQueue (and remove the redundant promotion block from _handleReadyForQuery) to eliminate the microtask/macrotask race where the next query could be activated as _activeQuery before the error's ReadyForQuery arrived, causing that RFQ to be handled by the wrong query. Also adds the error-listener fix for the query_timeout integration test so the expected stream-destroy doesn't leak as an unhandled 'error'.
- New features/pipelining.mdx documenting the opt-in flag - Client and Pool API reference updated - Pool accepts `pipelining: true` and sets it on every client it creates
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Adds opt-in query pipelining via
client.pipelining = true(ornew Pool({ pipelining: true })).Pipelined queries are sent to the server without waiting for previous responses, using PostgreSQL's extended query protocol with per-query
Syncfor error isolation. ~2-3x throughput on batches of simple queries locally.pg— three-queue state machine (_queryQueue→_sentQueryQueue→_activeQuery), named-statement dedup across in-flight Parse, gracefulend(),query_timeoutunblocks the pipelinepg-pool—pipeliningoption sets the flag on every client the pool creates