mirror of
https://github.com/postgres/postgres.git
synced 2025-05-01 01:04:50 +03:00
ac25e1044f
Previously PostgreSQL built with -DLWLOCK_STATS could report more than one LWLock statistics entries for the same backend process and the same LWLock. This is strange and only one statistics should be output in that case, instead. The cause of this issue is that the key variable used for LWLock stats hash table was not fully initialized. The key consists of two fields and they were initialized. But the following 4 bytes allocated in the key variable for the alignment was not initialized. So even if the same key was specified, hash_search(HASH_ENTER) could not find the existing entry for that key and created new one. This commit fixes this issue by initializing the key variable with zero. As the side effect of this commit, the volume of LWLock statistics output would be reduced very much. Back-patch to v10, where commit 3761fe3c20 introduced the issue. Author: Fujii Masao Reviewed-by: Julien Rouhaud, Kyotaro Horiguchi Discussion: https://postgr.es/m/26359edb-798a-568f-d93a-6aafac49752d@oss.nttdata.com
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/.