mirror of
https://github.com/neondatabase/neon.git
synced 2026-05-30 11:30:37 +00:00
b6eea65597
If the pageserver connection is lost while receiving the prefetch request, the prefetch queue is cleared. The error message prints the values from the prefetch slot, but because the slot was already cleared, they're all zeros: LOG: [NEON_SMGR] [shard 0] No response from reading prefetch entry 0: 0/0/0.0 block 0. This can be caused by a concurrent disconnect To fix, make local copies of the values. In the passing, also add a sanity check that if the receive() call succeeds, the prefetch slot is still intact.
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.