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When performing pg_rewind, the presence of a read-only file which is not accessible for writes will cause a failure while processing. This can cause the control file of the target data folder to be truncated, causing it to not be reusable with a successive run. Also, when pg_rewind fails mid-flight, there is likely no way to be able to recover the target data folder anyway, in which case a new base backup is the best option. A note is added in the documentation as well about. Reported-by: Christian H. Author: Michael Paquier Reviewed-by: Andrew Dunstan Discussion: https://postgr.es/m/20180104200633.17004.16377%40wrigleys.postgresql.org
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/.