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If a standby server has a cascading standby server connected to it, it's possible that WAL has already been sent up to the next WAL page boundary, splitting a WAL record in the middle, when the first standby server is promoted. Don't throw an assertion failure or error in walsender if that happens. Also, fix a variant of the same bug in pg_receivexlog: if it had already received WAL on previous timeline up to a segment boundary, when the upstream standby server is promoted so that the timeline switch record falls on the previous segment, pg_receivexlog would miss the segment containing the timeline switch. To fix that, have walsender send the position of the timeline switch at end-of-streaming, in addition to the next timeline's ID. It was previously assumed that the switch happened exactly where the streaming stopped. Note: this is an incompatible change in the streaming protocol. You might get an error if you try to stream over timeline switches, if the client is running 9.3beta1 and the server is more recent. It should be fine after a reconnect, however. Reported by Fujii Masao. |
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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: 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/.