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Provide recovery_init_sync_method=syncfs.

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Since commit 2ce439f3 we have opened every file in the data directory
and called fsync() at the start of crash recovery.  This can be very
slow if there are many files, leading to field complaints of systems
taking minutes or even hours to begin crash recovery.

Provide an alternative method, for Linux only, where we call syncfs() on
every possibly different filesystem under the data directory.  This is
equivalent, but avoids faulting in potentially many inodes from
potentially slow storage.

The new mode comes with some caveats, described in the documentation, so
the default value for the new setting is "fsync", preserving the older
behavior.

Reported-by: Michael Brown <michael.brown@discourse.org>
Reviewed-by: Fujii Masao <masao.fujii@oss.nttdata.com>
Reviewed-by: Paul Guo <guopa@vmware.com>
Reviewed-by: Bruce Momjian <bruce@momjian.us>
Reviewed-by: Justin Pryzby <pryzby@telsasoft.com>
Reviewed-by: David Steele <david@pgmasters.net>
Discussion: https://postgr.es/m/11bc2bb7-ecb5-3ad0-b39f-df632734cd81%40discourse.org
Discussion: https://postgr.es/m/CAEET0ZHGnbXmi8yF3ywsDZvb3m9CbdsGZgfTXscQ6agcbzcZAw%40mail.gmail.com
This commit is contained in:
Thomas Munro
2021-03-20 11:46:32 +13:00
parent b822ae13ea
commit 61752afb26
9 changed files with 129 additions and 2 deletions
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1
src/tools/msvc/Solution.pm
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@ -388,6 +388,7 @@ sub GenerateFiles
HAVE_STRUCT_TM_TM_ZONE => undef,
HAVE_SYNC_FILE_RANGE => undef,
HAVE_SYMLINK => 1,
HAVE_SYNCFS => undef,
HAVE_SYSLOG => undef,
HAVE_SYS_EPOLL_H => undef,
HAVE_SYS_EVENT_H => undef,