Peter Dillinger a7fd1d0881 Make backup restore atomic, with sync option (#8568) ... Summary: Guarantees that if a restore is interrupted, DB::Open will fail. This works by restoring CURRENT first to CURRENT.tmp then as a final step renaming to CURRENT. Also makes restore respect BackupEngineOptions::sync (default true). When set, the restore is guaranteed persisted by the time it returns OK. Also makes the above atomicity guarantee work in case the interruption is power loss or OS crash (not just process interruption or crash). Fixes https://github.com/facebook/rocksdb/issues/8500 Pull Request resolved: https://github.com/facebook/rocksdb/pull/8568 Test Plan: added to backup mini-stress unit test. Passes with gtest_repeat=100 (whereas fails 7 times without the CURRENT.tmp) Reviewed By: akankshamahajan15 Differential Revision: D29812605 Pulled By: pdillinger fbshipit-source-id: 24e9a993b305b1835ca95558fa7a7152e54cda8e		2021-08-06 09:50:21 -07:00
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rocksdb	Make backup restore atomic, with sync option (#8568)	2021-08-06 09:50:21 -07:00