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## Problem See https://neondb.slack.com/archives/C04DGM6SMTM/p1732110190129479 We observe the following error in the logs ``` [XX000] ERROR: [NEON_SMGR] [shard 3] Incorrect prefetch read: status=1 response=0x7fafef335138 my=128 receive=128 ``` most likely caused by changing `neon.readahead_buffer_size` ## Summary of changes 1. Copy shard state 2. Do not use prefetch_set_unused in readahead_buffer_resize 3. Change prefetch buffer overflow criteria --------- 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.