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When reading large amounts of preexisting WAL during logical decoding using the SQL interface we possibly could fail to check interrupts in due time. Similarly the same could happen on systems with a very high WAL volume while creating a new logical replication slot, independent of the used interface. Previously these checks where only performed in xlogreader's read_page callbacks, while waiting for new WAL to be produced. That's not sufficient though, if there's never a need to wait. Walsender's send loop already contains a interrupt check. Backpatch to 9.4 where the logical decoding feature was introduced.
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/.