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

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anand76 afa2420c2b Introduce a new storage specific Env API (#5761) ... Summary: The current Env API encompasses both storage/file operations, as well as OS related operations. Most of the APIs return a Status, which does not have enough metadata about an error, such as whether its retry-able or not, scope (i.e fault domain) of the error etc., that may be required in order to properly handle a storage error. The file APIs also do not provide enough control over the IO SLA, such as timeout, prioritization, hinting about placement and redundancy etc. This PR separates out the file/storage APIs from Env into a new FileSystem class. The APIs are updated to return an IOStatus with metadata about the error, as well as to take an IOOptions structure as input in order to allow more control over the IO. The user can set both ```options.env``` and ```options.file_system``` to specify that RocksDB should use the former for OS related operations and the latter for storage operations. Internally, a ```CompositeEnvWrapper``` has been introduced that inherits from ```Env``` and redirects individual methods to either an ```Env``` implementation or the ```FileSystem``` as appropriate. When options are sanitized during ```DB::Open```, ```options.env``` is replaced with a newly allocated ```CompositeEnvWrapper``` instance if both env and file_system have been specified. This way, the rest of the RocksDB code can continue to function as before. This PR also ports PosixEnv to the new API by splitting it into two - PosixEnv and PosixFileSystem. PosixEnv is defined as a sub-class of CompositeEnvWrapper, and threading/time functions are overridden with Posix specific implementations in order to avoid an extra level of indirection. The ```CompositeEnvWrapper``` translates ```IOStatus``` return code to ```Status```, and sets the severity to ```kSoftError``` if the io_status is retryable. The error handling code in RocksDB can then recover the DB automatically. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5761 Differential Revision: D18868376 Pulled By: anand1976 fbshipit-source-id: 39efe18a162ea746fabac6360ff529baba48486f		5 years ago
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backupable	Introduce a new storage specific Env API (#5761)	5 years ago
blob_db	Introduce a new storage specific Env API (#5761)	5 years ago
cassandra	Organizing rocksdb/db directory	6 years ago
checkpoint	Introduce a new storage specific Env API (#5761)	5 years ago
compaction_filters	Comment out unused variables	7 years ago
convenience	Auto roll logger to enforce options.keep_log_file_num immediately after a new file is created (#5370)	6 years ago
leveldb_options	Change RocksDB License	7 years ago
memory	Make clang-analyzer happy (#5821)	5 years ago
merge_operators	Apply formatter to recent 200+ commits. (#5830)	5 years ago
option_change_migration	Avoid double-compacting data in bottom level in manual compactions (#5138)	6 years ago
options	Introduce a new storage specific Env API (#5761)	5 years ago
persistent_cache	Introduce a new storage specific Env API (#5761)	5 years ago
simulator_cache	Introduce a new storage specific Env API (#5761)	5 years ago
table_properties_collectors	Reduce the number of random iterations in compact_on_deletion_collector_test (#5635)	5 years ago
trace	Introduce a new storage specific Env API (#5761)	5 years ago
transactions	Fix compilation under MSVC VS2015 (#6081)	5 years ago
ttl	Apply formatter to recent 200+ commits. (#5830)	5 years ago
write_batch_with_index	Batched MultiGet API for multiple column families (#5816)	5 years ago
debug.cc	Support GetAllKeyVersions() for non-default cf (#5544)	5 years ago
env_librados.cc	Optionally wait on bytes_per_sync to smooth I/O (#5183)	6 years ago
env_librados.md	Add EnvLibrados - RocksDB Env of RADOS (#1222)	8 years ago
env_librados_test.cc	Move test related files under util/ to test_util/ (#5377)	6 years ago
env_mirror.cc	Optionally wait on bytes_per_sync to smooth I/O (#5183)	6 years ago
env_mirror_test.cc	Move test related files under util/ to test_util/ (#5377)	6 years ago
env_timed.cc	Apply modernize-use-override (2nd iteration)	6 years ago
env_timed_test.cc	Move test related files under util/ to test_util/ (#5377)	6 years ago
merge_operators.h	New API to get all merge operands for a Key (#5604)	5 years ago
object_registry.cc	The ObjectRegistry class replaces the Registrar and NewCustomObjects.… (#5293)	5 years ago
object_registry_test.cc	The ObjectRegistry class replaces the Registrar and NewCustomObjects.… (#5293)	5 years ago
util_merge_operators_test.cc	Move test related files under util/ to test_util/ (#5377)	6 years ago