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This commit is mostly a revert of aaa3aed, that switched the routine doing the internal renaming of recycled WAL segments to use on Windows a combination of CreateHardLinkA() plus unlink() instead of rename(). As reported by several users of Postgres 13, this is causing concurrency issues when manipulating WAL segments, mostly in the shape of the following error: LOG: could not rename file "pg_wal/000000XX000000YY000000ZZ": Permission denied This moves back to a logic where a single rename() (well, pgrename() for Windows) is used. This issue has proved to be hard to hit when I tested it, facing it only once with an archive_command that was not able to do its work, so it is environment-sensitive. The reporters of this issue have been able to confirm that the situation improved once we switched back to a single rename(). In order to check things, I have provided to the reporters a patched build based on 13.2 with aaa3aed reverted, to test if the error goes away, and an unpatched build of 13.2 to test if the error still showed up (just to make sure that I did not mess up my build process). Extra thanks to Fujii Masao for pointing out what looked like the culprit commit, and to all the reporters for taking the time to test what I have sent them. Reported-by: Andrus, Guy Burgess, Yaroslav Pashinsky, Thomas Trenz Reviewed-by: Tom Lane, Andres Freund Discussion: https://postgr.es/m/3861ff1e-0923-7838-e826-094cc9bef737@hot.ee Discussion: https://postgr.es/m/16874-c3eecd319e36a2bf@postgresql.org Discussion: https://postgr.es/m/095ccf8d-7f58-d928-427c-b17ace23cae6@burgess.co.nz Discussion: https://postgr.es/m/16927-67c570d968c99567%40postgresql.org Discussion: https://postgr.es/m/YFBcRbnBiPdGZvfW@paquier.xyz Backpatch-through: 13
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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.