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This allows recovery to notice certain incorrect recovery scenarios. If a server has recovered to point X on timeline 5, and you restart recovery, it better be on timeline 5 when it reaches point X again, not on some timeline with a higher ID. This can happen e.g if you a standby server is shut down, a new timeline appears in the WAL archive, and the standby server is restarted. It will try to follow the new timeline, which is wrong because some WAL on the old timeline was already replayed before shutdown. Requires an initdb (or at least pg_resetxlog), because this adds a field to the control file.
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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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/.