fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

Andrew Kryczka b97685aef6 fix backup engine when latest backup corrupt ... Summary: Backup engine is intentionally openable even when some backups are corrupt. Previously the engine could write new backups as long as the most recent backup wasn't corrupt. This PR makes the backup engine able to create new backups even when the most recent one is corrupt. We now maintain two ID instance variables: - `latest_backup_id_` is used when creating backup to choose the new ID - `latest_valid_backup_id_` is used when restoring latest backup since we want most recent valid one Closes https://github.com/facebook/rocksdb/pull/2804 Differential Revision: D5734148 Pulled By: ajkr fbshipit-source-id: db440707b31df2c7b084188aa5f6368449e10bcf		8 years ago
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backupable_db.cc	fix backup engine when latest backup corrupt	8 years ago
backupable_db_test.cc	fix backup engine when latest backup corrupt	8 years ago