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

2018-07-11 14:57:46 -07:00

..

backupable_db_test.cc

SetOptions Backup Race Condition (#4108)

2018-07-11 14:57:46 -07:00

backupable_db.cc

Add file name info to SequentialFileReader. (#4026)

2018-06-21 08:42:24 -07:00