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While applying the truncate change, the logical apply worker acquires RowExclusiveLock on the relation being truncated. This allowed truncate on the relation at a time by two apply workers which lead to a deadlock. The reason was that one of the workers after updating the pg_class tuple tries to acquire SHARE lock on the relation and started to wait for the second worker which has acquired RowExclusiveLock on the relation. And when the second worker tries to update the pg_class tuple, it starts to wait for the first worker which leads to a deadlock. Fix it by acquiring AccessExclusiveLock on the relation before applying the truncate change as we do for normal truncate operation. Author: Peter Smith, test case by Haiying Tang Reviewed-by: Dilip Kumar, Amit Kapila Backpatch-through: 11 Discussion: https://postgr.es/m/CAHut+PsNm43p0jM+idTvWwiGZPcP0hGrHMPK9TOAkc+a4UpUqw@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/.