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For correctness of summarization results, it is critical that the snapshot used during the summarization scan is able to see all tuples that are live to all transactions -- including tuples inserted or deleted by in-progress transactions. Otherwise, it would be possible for a transaction to insert a tuple, then idle for a long time while a concurrent transaction executes summarization of the range: this would result in the inserted value not being considered in the summary. Previously we were trying to use a MVCC snapshot in conjunction with adding a "placeholder" tuple in the index: the snapshot would see all committed tuples, and the placeholder tuple would catch insertions by any new inserters. The hole is that prior insertions by transactions that are still in progress by the time the MVCC snapshot was taken were ignored. Kevin Grittner reported this as a bogus error message during vacuum with default transaction isolation mode set to repeatable read (because the error report mentioned a function name not being invoked during), but the problem is larger than that. To fix, tweak IndexBuildHeapRangeScan to have a new mode that behaves the way we need using SnapshotAny visibility rules. This change simplifies the BRIN code a bit, mainly by removing large comments that were mistaken. Instead, rely on the SnapshotAny semantics to provide what it needs. (The business about a placeholder tuple needs to remain: that covers the case that a transaction inserts a a tuple in a page that summarization already scanned.) Discussion: https://www.postgresql.org/message-id/20150731175700.GX2441@postgresql.org In passing, remove a couple of unused declarations from brin.h and reword a comment to be proper English. This part submitted by Kevin Grittner. Backpatch to 9.5, where BRIN was introduced. |
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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. 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/.