Summary:
* CreateNewBackup(WithMetadata) returning the BackupID of new backup
through optional new output param. This is especially useful with the
new mutithreading support, so that you can transactionally determine the
ID of a backup you create.
* GetBackupInfo / GetLatestBackupInfo for individual backups, so that
you don't have to comb through a vector of backups if you don't want to.
Updated HISTORY.md (including re: BlobDB support as new feature)
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8170
Test Plan:
Added test logic to existing tests, to minimize increase in
cost of running tests
Reviewed By: zhichao-cao
Differential Revision: D27680410
Pulled By: pdillinger
fbshipit-source-id: 1fc45b73d81aae293ccd4a43d9583d7fd915d3eb
bb75092574