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| author | Thomas Munro <tmunro@postgresql.org> | 2021-03-20 11:46:32 +1300 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2021-03-20 12:07:28 +1300 |
| commit | 61752afb26404dfc99a535c7a53f7f04dc110263 (patch) | |
| tree | dbb477a1f01f495a180e891028e3d1545532881d /src/backend/utils/misc/postgresql.conf.sample | |
| parent | b822ae13ea93c18326d58d47829bbc66d36fae5c (diff) | |
| download | postgresql-61752afb26404dfc99a535c7a53f7f04dc110263.tar.gz postgresql-61752afb26404dfc99a535c7a53f7f04dc110263.zip | |
Provide recovery_init_sync_method=syncfs.
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
Diffstat (limited to 'src/backend/utils/misc/postgresql.conf.sample')
| -rw-r--r-- | src/backend/utils/misc/postgresql.conf.sample | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample index b0b49b38233..86425965d0d 100644 --- a/src/backend/utils/misc/postgresql.conf.sample +++ b/src/backend/utils/misc/postgresql.conf.sample @@ -761,6 +761,7 @@ #restart_after_crash = on # reinitialize after backend crash? #remove_temp_files_after_crash = on # remove temporary files after # backend crash? +#recovery_init_sync_method = fsync # fsync, syncfs (Linux 5.8+) #data_sync_retry = off # retry or panic on failure to fsync # data? # (change requires restart) |