mirror of
https://github.com/neondatabase/neon.git
synced 2026-05-18 21:50:37 +00:00
dc2ab4407f
If a standby is started right after switching to a new WAL segment, the request in the SLRU download request would point to the beginning of the segment (e.g. 0/5000000), while the not-modified-since LSN would point to just after the page header (e.g. 0/5000028). It's effectively the same position, as there cannot be any WAL records in between, but the pageserver rightly errors out on any request where the request LSN < not-modified since LSN. To fix, round down the not-modified since LSN to the beginning of the page like the request LSN. Fixes issue #8030
neon extension consists of several parts:
shared preload library neon.so
-
implements storage manager API and network communications with remote page server.
-
walproposer: implements broadcast protocol between postgres and WAL safekeepers.
-
control plane connector: Captures updates to roles/databases using ProcessUtility_hook and sends them to the control ProcessUtility_hook.
-
remote extension server: Request compute_ctl to download extension files.
-
file_cache: Local file cache is used to temporary store relations pages in local file system for better performance.
-
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.