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Thomas Munro 61752afb26 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		5 years ago
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src	Provide recovery_init_sync_method=syncfs.	5 years ago
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