25216c9893
The whole concept of _hash_wrtbuf() is that we need to know at the time we're releasing the buffer lock (and pin) whether we dirtied the buffer, but this is easy to get wrong. This patch actually fixes one non-obvious bug of that form: hashbucketcleanup forgot to signal _hash_squeezebucket, which gets the primary bucket page already locked, as to whether it had already dirtied the page. Calling MarkBufferDirty() at the places where we dirty the buffer is more intuitive and lets us simplify the code in various places as well. On top of all that, the ultimate goal here is to make hash indexes WAL-logged, and as the comments to _hash_wrtbuf() note, it should go away when that happens. Making it go away a little earlier than that seems like a good preparatory step. Report by Jeff Janes. Diagnosis by Amit Kapila, Kuntal Ghosh, and Dilip Kumar. Patch by me, after studying an alternative patch submitted by Amit Kapila. Discussion: http://postgr.es/m/CAA4eK1Kf6tOY0oVz_SEdngiNFkeXrA3xUSDPPORQvsWVPdKqnA@mail.gmail.com |
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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/.