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## Problem While configuring or reconfiguring PG due to PageServer movements, it's possible PG may get stuck if PageServer is moved around after fetching the spec from StorageController. ## Summary of changes To fix this issue, this PR introduces two changes: 1. Fail the PG query directly if the query cannot request configuration for certain number of times. 2. Introduce a new state `RefreshConfiguration` in compute tools to differentiate it from `RefreshConfigurationPending`. If compute tool is already in `RefreshConfiguration` state, then it will not accept new request configuration requests. ## How is this tested? Chaos testing. Co-authored-by: Chen Luo <chen.luo@databricks.com>
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.