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StartupXLOG() still has ThisTimeLineID as a local variable, but the remaining code in xlog.c now needs to the relevant TimeLineID by some other means. Mostly, this means that we now pass it as a function parameter to a bunch of functions where we didn't previously. However, a few cases require special handling: - In functions that might be called by outside callers who wouldn't necessarily know what timeline to specify, we get the timeline ID from shared memory. XLogCtl->ThisTimeLineID can be used in most cases since recovery is known to have completed by the time those functions are called. In xlog_redo(), we can use XLogCtl->replayEndTLI. - XLogFileClose() needs to know the TLI of the open logfile. Do that with a new global variable openLogTLI. While someone could argue that this is just trading one global variable for another, the new one has a far more narrow purposes and is referenced in just a few places. - read_backup_label() now returns the TLI that it obtains by parsing the backup_label file. Previously, ReadRecord() could be called to parse the checkpoint record without ThisTimeLineID having been initialized. Now, the timeline is passed down, and I didn't want to pass an uninitialized variable; this change lets us avoid that. The old coding didn't seem to have any practical consequences that we need to worry about, but this is cleaner. - In BootstrapXLOG(), it's just a constant. Patch by me, reviewed and tested by Michael Paquier, Amul Sul, and Álvaro Herrera. Discussion: https://postgr.es/m/CA+TgmobfAAqhfWa1kaFBBFvX+5CjM=7TE=n4r4Q1o2bjbGYBpA@mail.gmail.com |
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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/.