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ef8101a9be
pagestore_smgr.c had grown pretty large. Split into two parts, such that the smgr routines that PostgreSQL code calls stays in pagestore_smgr.c, and all the prefetching logic and other lower-level routines related to communicating with the pageserver are moved to a new source file, "communicator.c". There are plans to replace communicator parts with a new implementation. See https://github.com/neondatabase/neon/pull/10799. This commit doesn't implement any of the new things yet, but it is good preparation for it. I'm imagining that the new implementation will approximately replace the current "communicator.c" code, exposing roughly the same functions to pagestore_smgr.c. This commit doesn't change any functionality or behavior, or make any other changes to the existing code: It just moves existing code around.
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.