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

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Yanqin Jin 5ab5537d79 Deflake unit test BackupEngineTest.Concurrency (#10069) ... Summary: After https://github.com/facebook/rocksdb/issues/9984, BackupEngineTest.Concurrency becomes flaky. During DB::Open(), someone else can rename/remove the LOG file, causing this thread's `CreateLoggerFromOptions()` to fail. The reason is that the operation sequence of "FileExists -> Rename" is not atomic. It's possible that a FileExists() returns OK, but the file gets deleted before Rename(), causing the latter to return IOError with PathNotFound subcode. Although it's not encouraged to concurrently modify the contents of the directories managed by the database instance in this case, we can still perform some simple handling to make DB::Open() more robust. In this case, we can check if a racing thread has deleted the original LOG file, we can allow this thread to continue creating a new LOG file. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10069 Test Plan: ~/gtest-parallel/gtest-parallel -r 100 ./backup_engine_test --gtest_filter=BackupEngineTest.Concurrency Reviewed By: jay-zhuang Differential Revision: D36736913 Pulled By: riversand963 fbshipit-source-id: 3cbe92d77ca175e55e586bdb1a32ac8107217ae6		2 years ago
..
auto_roll_logger.cc	Deflake unit test BackupEngineTest.Concurrency (#10069)	2 years ago
auto_roll_logger.h	Add a SystemClock class to capture the time functions of an Env (#7858)	4 years ago
auto_roll_logger_test.cc	Fail DB::Open() if logger cannot be created (#9984)	3 years ago
env_logger.h	Fix potential ambiguities in/around port/sys_time.h (#10045)	3 years ago
env_logger_test.cc	Make SystemClock into a Customizable Class (#8636)	3 years ago
event_logger.cc	Remove unused includes (#7604)	4 years ago
event_logger.h	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
event_logger_test.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
log_buffer.cc	Fix potential ambiguities in/around port/sys_time.h (#10045)	3 years ago
log_buffer.h	Fix potential ambiguities in/around port/sys_time.h (#10045)	3 years ago
logging.h	Fix info log source file display length (#5824)	5 years ago
posix_logger.h	Fix potential ambiguities in/around port/sys_time.h (#10045)	3 years ago