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Previously, it thought that any plain file located under global, base, or a tablespace directory had checksums unless it was in a short list of excluded files. Now, it thinks that files in those directories have checksums if parse_filename_for_nontemp_relation says that they are relation files. (Temporary relation files don't matter because they're excluded from the backup anyway.) This changes the behavior if you have stray files not managed by PostgreSQL in the relevant directories. Previously, you'd get some kind of checksum-related complaint if such files existed, assuming that the cluster had checksums enabled and that the base backup wasn't run with NOVERIFY_CHECKSUMS. Now, you won't get those complaints any more. That seems like an improvement to me, because those files were presumably not created by PostgreSQL and so there is no reason to think that they would be checksummed like a PostgreSQL relation file. (If we want to complain about such files, we should complain about them existing at all, not just about their checksums.) The point of this change is to make the code more consistent. sendDir() was already calling parse_filename_for_nontemp_relation() as part of an effort to determine which files to include in the backup. So, it already had the information about whether a certain file was a relation file. sendFile() then used a separate method, embodied in is_checksummed_file(), to make what is essentially the same determination. It's better not to make the same decision using two different methods, especially in closely-related code. Patch by me. Reviewed by Dilip Kumar and Álvaro Herrera. Thanks also to Jakub Wartak and Peter Eisentraut for comments, suggestions, and testing on the larger patch set of which this is a part. Discussion: http://postgr.es/m/CAFiTN-snhaKkWhi2Gz5i3cZeKefun6sYL==wBoqqnTXxX4_mFA@mail.gmail.com Discussion: http://postgr.es/m/202311141312.u4qx5gtpvfq3@alvherre.pgsql |
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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. 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, 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/.