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Previously ValidXLOGHeader() could not handle properly the case where
we re-read the WAL segment after reading its subsequent segment having
larger TLI. This case can happen, for example, when the WAL record is split
across two segments having different TLI. In this case, since the segment
we're re-reading has the smaller TLI than its subsequent segment we've
already read, ValidXLOGHeader() reported an error "out-of-sequence TLI"
even though TLI sequence was valid (i.e., TLI doesn't go backwards across
successive WAL pages and segments).
This issue was fixed by commit 7fcbf6a405
in 9.3 or later though there is no mention to the bug fix in its commit log.
It changed the WAL check code so that it verifies TLI for pages that are
later than the last remembered LSN. This patch applies the same change to
9.2 where the issue still existed.
Author: Takayuki Tsunakawa and Amit Kapila
Reviewed-By: Robert Haas
Discussion: https://postgr.es/m/0A3221C70F24FB45833433255569204D1F5E15E5@G01JPEXMBYT05
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.