Michael Paquier c3de0f9eed Fix failures with incorrect epoch handling for 2PC files at recovery
At the beginning of recovery, an orphaned two-phase file in an epoch
different than the one defined in the checkpoint record could not be
removed based on the assumptions that AdjustToFullTransactionId() relies
on, assuming that all files would be either from the current epoch or
from the previous epoch.

If the checkpoint epoch was 0 while the 2PC file was orphaned and in the
future, AdjustToFullTransactionId() would underflow the epoch used to
build the 2PC file path.  In non-assert builds, this would create a
WARNING message referring to a 2PC file with an epoch of "FFFFFFFF" (or
UINT32_MAX), as an effect of the underflow calculation, leaving the
orphaned file around.

Some tests are added with dummy 2PC files in the past and the future,
checking that these are properly removed.

Issue introduced by 5a1dfde8334b, that has switched two-phase state
files to use FullTransactionIds.

Reported-by: Vitaly Davydov
Author: Michael Paquier
Reviewed-by: Vitaly Davydov
Discussion: https://postgr.es/m/13b5b6-676c3080-4d-531db900@47931709
Backpatch-through: 17
2024-12-30 09:58:09 +09:00
2019-12-18 09:13:13 +01:00
2022-12-04 15:23:00 -05:00
2024-01-03 20:49:05 -05:00
2020-02-10 20:47:50 +01:00

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/17/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/17/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/.

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he World's Most Advanced Open Source Relational Database.
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