On Fri, May 30, 2014 at 5:33 PM, Josh Kupershmidt <schmi...@gmail.com> wrote: > On Tue, May 27, 2014 at 10:01 PM, Gurjeet Singh <gurj...@singh.im> wrote: > >> When the Postgres server is being stopped/shut down, the `Buffer >> Saver` scans the >> shared-buffers of Postgres, and stores the unique block identifiers of >> each cached >> block to the disk. This information is saved under the >> `$PGDATA/pg_hibernator/` >> directory. For each of the database whose blocks are resident in shared >> buffers, >> one file is created; for eg.: `$PGDATA/pg_hibernator/2.postgres.save`. > > This file-naming convention seems a bit fragile. For example, on my > filesystem (HFS) if I create a database named "foo / bar", I'll get a > complaint like: > > ERROR: could not open "pg_hibernator/5.foo / bar.save": No such file > or directory > > during shutdown.
Thanks for the report. I have reworked the file naming, and now the save-file name is simply '<integer>.save', so the name of a database does not affect the file name on disk. Instead, the null-terminated database name is now written in the file, and read back for use when restoring the buffers. Attached is the new version of pg_hibernator, with updated code and README. Just a heads up for anyone who might have read/reviewed previous version's code, there's some unrelated trivial code and Makefile changes as well in this version, which can be easily spotted by a `diff -r`. Best regards, -- Gurjeet Singh http://gurjeet.singh.im/ EDB www.EnterpriseDB.com
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