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Mirror of the official PostgreSQL GIT repository. Note that this is just a *mirror* - we don't work with pull requests on github. To contribute, please see https://wiki.postgresql.org/wiki/Submitting_a_Patch
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Michael Paquier 62a17a9283 Integrate FullTransactionIds deeper into two-phase code 
This refactoring is a follow-up of the work done in 5a1dfde833, that
has switched 2PC file names to use FullTransactionIds when written on
disk.  This will help with the integration of a follow-up solution
related to the handling of two-phase files during recovery, to address
older defects while reading these from disk after a crash.

This change is useful in itself as it reduces the need to build the
file names from epoch numbers and TransactionIds, because we can use
directly FullTransactionIds from which the 2PC file names are guessed.
So this avoids a lot of back-and-forth between the FullTransactionIds
retrieved from the file names and how these are passed around in the
internal 2PC logic.

Note that the core of the change is the use of a FullTransactionId
instead of a TransactionId in GlobalTransactionData, that tracks 2PC
file information in shared memory.  The change in TwoPhaseCallback makes
this commit unfit for stable branches.

Noah has contributed a good chunk of this patch.  I have spent some time
on it as well while working on the issues with two-phase state files and
recovery.

Author: Noah Misch <noah@leadboat.com>
Co-Authored-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/Z5sd5O9JO7NYNK-C@paquier.xyz
Discussion: https://postgr.es/m/20250116205254.65.nmisch@google.com
2025-07-07 12:50:40 +09:00
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src Integrate FullTransactionIds deeper into two-phase code 2025-07-07 12:50:40 +09:00
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README.md

PostgreSQL Database Management System

This directory contains the source code distribution of the PostgreSQL database management system.

PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.