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## Problem See https://github.com/neondatabase/neon/issues/12018 Now `prefetch_register_bufferv` calculates min_ring_index of all vector requests. But because of pump prefetch state or connection failure, previous slots can be already proceeded and reused. ## Summary of changes Instead of returning minimal index, this function should return last slot index. Actually result of this function is used only in two places. A first place just fort checking (and this check is redundant because the same check is done in `prefetch_register_bufferv` itself. And in the second place where index of filled slot is actually used, there is just one request. Sp fortunately this bug can cause only assert failure in debug build. --------- 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.