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## Problem See https://github.com/neondatabase/neon/issues/11997 This guard prevents race condition with pump prefetch state (initiated by timeout). Assert checks that prefetching is also done under guard. But prewarm knows nothing about it. ## Summary of changes Pump prefetch state only in regular backends. Prewarming is done by background workers now. Also it seems to have not sense to pump prefetch state in any other background workers: parallel executors, vacuum,... because they are short living and can not leave unconsumed responses in socket. --------- Co-authored-by: Konstantin Knizhnik <knizhnik@neon.tech>
neon extension consists of several parts:
shared preload library neon.so
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implements storage manager API and network communications with remote page server.
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walproposer: implements broadcast protocol between postgres and WAL safekeepers.
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control plane connector: Captures updates to roles/databases using ProcessUtility_hook and sends them to the control ProcessUtility_hook.
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remote extension server: Request compute_ctl to download extension files.
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file_cache: Local file cache is used to temporary store relations pages in local file system for better performance.
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relsize_cache: Relation size cache for better neon performance.
SQL functions in neon--*.sql
Utility functions to expose neon specific information to user and metrics collection. This extension is created in all databases in the cluster by default.