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

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Yanqin Jin 331cb63641 SetOptions Backup Race Condition (#4108) ... Summary: Prior to this PR, there was a race condition between `DBImpl::SetOptions` and `BackupEngine::CreateNewBackup`, as illustrated below. ``` Time thread 1 thread 2 | CreateNewBackup -> GetLiveFiles | SetOptions -> RenameTempFileToOptionsFile | SetOptions -> RenameTempFileToOptionsFile | SetOptions -> RenameTempFileToOptionsFile // unlink oldest OPTIONS file | copy the oldest OPTIONS // IO error! V ``` Proposed fix is to check the value of `DBImpl::disable_obsolete_files_deletion_` before calling `DeleteObsoleteOptionsFiles`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4108 Differential Revision: D8796360 Pulled By: riversand963 fbshipit-source-id: 02045317f793ea4c7d4400a5bf333b8502fa3e82		6 years ago
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backupable_db.cc	Add file name info to SequentialFileReader. (#4026)	6 years ago
backupable_db_test.cc	SetOptions Backup Race Condition (#4108)	6 years ago