rocksdb/db/db_impl
wenh 4924a506b9 Reduce env_->GetChildren() calls in DBImpl::Recover() (#7044)
Summary:
There currently exist multiple `GetChildren()` calls in `DBImpl::Recover()`, which can be expensive in cases of distributed file systems.
This pull request try to call `DBImpl::Recover()` of each necessary directory only _once_ and reuse the results in the places of repeated calls in current code.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7044

Test Plan:
Run `make check` and use the default test suite. The modified code should be semantically identical to the current code. As a proof of this solution, we may optionally deploy the system onto a (real or simulated) distributed system and expect reduced latency caused by manifest fetching.

(WIP)

Reviewed By: riversand963

Differential Revision: D22419925

Pulled By: roghnin

fbshipit-source-id: d3774fbfbc246c5527101bc16747eb5c90919886
2020-07-10 13:41:08 -07:00
..
db_impl_compaction_flush.cc Replace reinterpret_cast with static_cast_with_check (#7067) 2020-07-02 19:25:41 -07:00
db_impl_debug.cc Replace reinterpret_cast with static_cast_with_check (#7067) 2020-07-02 19:25:41 -07:00
db_impl_experimental.cc Replace reinterpret_cast with static_cast_with_check (#7067) 2020-07-02 19:25:41 -07:00
db_impl_files.cc First step towards handling MANIFEST write error (#6949) 2020-06-24 19:07:08 -07:00
db_impl_open.cc Reduce env_->GetChildren() calls in DBImpl::Recover() (#7044) 2020-07-10 13:41:08 -07:00
db_impl_readonly.cc Replace reinterpret_cast with static_cast_with_check (#7067) 2020-07-02 19:25:41 -07:00
db_impl_readonly.h API change: DB::OpenForReadOnly will not write to the file system unless create_if_missing is true (#6900) 2020-06-03 18:57:49 -07:00
db_impl_secondary.cc Replace reinterpret_cast with static_cast_with_check (#7067) 2020-07-02 19:25:41 -07:00
db_impl_secondary.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
db_impl_write.cc Replace reinterpret_cast with static_cast_with_check (#7067) 2020-07-02 19:25:41 -07:00
db_impl.cc Replace reinterpret_cast with static_cast_with_check (#7067) 2020-07-02 19:25:41 -07:00
db_impl.h Reduce env_->GetChildren() calls in DBImpl::Recover() (#7044) 2020-07-10 13:41:08 -07:00
db_secondary_test.cc More Makefile Cleanup (#7097) 2020-07-09 14:35:17 -07:00