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

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Cheng Chang 2d9efc9ab2 Cache result of GetLogicalBufferSize in Linux (#6457) ... Summary: In Linux, when reopening DB with many SST files, profiling shows that 100% system cpu time spent for a couple of seconds for `GetLogicalBufferSize`. This slows down MyRocks' recovery time when site is down. This PR introduces two new APIs: 1. `Env::RegisterDbPaths` and `Env::UnregisterDbPaths` lets `DB` tell the env when it starts or stops using its database directories . The `PosixFileSystem` takes this opportunity to set up a cache from database directories to the corresponding logical block sizes. 2. `LogicalBlockSizeCache` is defined only for OS_LINUX to cache the logical block sizes. Other modifications: 1. rename `logical buffer size` to `logical block size` to be consistent with Linux terms. 2. declare `GetLogicalBlockSize` in `PosixHelper` to expose it to `PosixFileSystem`. 3. change the functions `IOError` and `IOStatus` in `env/io_posix.h` to have external linkage since they are used in other translation units too. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6457 Test Plan: 1. A new unit test is added for `LogicalBlockSizeCache` in `env/io_posix_test.cc`. 2. A new integration test is added for `DB` operations related to the cache in `db/db_logical_block_size_cache_test.cc`. `make check` Differential Revision: D20131243 Pulled By: cheng-chang fbshipit-source-id: 3077c50f8065c0bffb544d8f49fb10bba9408d04		4 years ago
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composite_env_wrapper.h	Cache result of GetLogicalBufferSize in Linux (#6457)	4 years ago
env.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
env_basic_test.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
env_chroot.cc	Cache result of GetLogicalBufferSize in Linux (#6457)	4 years ago
env_chroot.h	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
env_encryption.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
env_hdfs.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
env_posix.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
env_test.cc	Add more unit test coverage to MultiRead (#6452)	4 years ago
file_system.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
fs_posix.cc	Cache result of GetLogicalBufferSize in Linux (#6457)	4 years ago
io_posix.cc	Cache result of GetLogicalBufferSize in Linux (#6457)	4 years ago
io_posix.h	Cache result of GetLogicalBufferSize in Linux (#6457)	4 years ago
io_posix_test.cc	Cache result of GetLogicalBufferSize in Linux (#6457)	4 years ago
mock_env.cc	Add missing MutexLock to MockEnv::CreateDir (#6474)	4 years ago
mock_env.h	Cache result of GetLogicalBufferSize in Linux (#6457)	4 years ago
mock_env_test.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago