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## Problem There's allegedly a bug where if we connect a subscriber before WAL is downloaded from the safekeeper, it creates an error. ## Summary of changes Adds support for pausing safekeepers from sending WAL to computes, and then creates a compute and attaches a subscriber while it's in this paused state. Fails to reproduce the issue, but probably a good test to have --------- Co-authored-by: Arseny Sher <sher-ars@yandex.ru>
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.