mirror of
https://github.com/neondatabase/neon.git
synced 2026-01-06 21:12:55 +00:00
ced338fd20
Add back code to parse transaction commit and abort records, and in particular the list of dropped relations in them. Add 'put_unlink' function to the Timeline trait and implementation. We had the code to handle dropped relations in the GC code and elsewhere in ObjectRepository already, but there was nothing to create the RelationSizeEntry::Unlink tombstone entries until now. Also add a test to check that GC correctly removes all page versions of a dropped relation. Implements https://github.com/zenithdb/zenith/issues/232, except for the "orphaned" rels. Reviewed-by: Konstantin Knizhnik
This module contains utilities for working with PostgreSQL file formats. It's a collection of structs that are auto-generated from the PostgreSQL header files using bindgen, and Rust functions to read and manipulate them. There are also a bunch of constants in `pg_constants.rs` that are copied from various PostgreSQL headers, rather than auto-generated. They mostly should be auto-generated too, but that's a TODO. The PostgreSQL on-disk file format is not portable across different CPU architectures and operating systems. It is also subject to change in each major PostgreSQL version. Currently, this module is based on PostgreSQL v14, but in the future we will probably need a separate copy for each PostgreSQL version. To interact with the C structs, there is some unsafe code in this module. Do not copy-paste that to the rest of the codebase! Keep the amount of unsafe code to a minimum, and limited to this module only, and only where it's truly needed. TODO: Currently, there is also some code that deals with WAL records in pageserver/src/waldecoder.rs. That should be moved into this module. The rest of the codebase should not have intimate knowledge of PostgreSQL file formats or WAL layout, that knowledge should be encapsulated in this module.