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Splitting a page consists of two separate steps: splitting the child page, and inserting the downlink for the new right page to the parent. Previously, we handled the case that you crash in between those steps with a cleanup routine after the WAL recovery had finished, which finished the incomplete split. However, that doesn't help if the page split is interrupted but the database doesn't crash, so that you don't perform WAL recovery. That could happen for example if you run out of disk space. Remove the end-of-recovery cleanup step. Instead, when a page is split, the left page is marked with a new INCOMPLETE_SPLIT flag, and when the downlink is inserted to the parent, the flag is cleared again. If an insertion sees a page with the flag set, it knows that the split was interrupted for some reason, and inserts the missing downlink before proceeding. I used the same approach to fix GIN and GiST split algorithms earlier. This was the last WAL cleanup routine, so we could get rid of that whole machinery now, but I'll leave that for a separate patch. Reviewed by Peter Geoghegan. |
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README
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/.