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fca85f8ef1
It's possible for WalSndWaitForWal to be asked to wait for WAL that doesn't exist yet. That's fine, in fact it's the normal situation if we're caught up; but when the client requests shutdown we should not keep waiting. The previous coding could wait indefinitely if the source server was idle. In passing, improve the rather weak comments in this area, and slightly rearrange some related code for better readability. Back-patch to 9.4 where this code was introduced. Discussion: https://postgr.es/m/14154.1498781234@sss.pgh.pa.us |
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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. 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/.