5dfde1c262
Summary: ## Summary Pull Request resolved: https://github.com/facebook/rocksdb/pull/15080 Introduce reusable `CoroStackableDBBase` forwarding and public `CoroDB::CoGet()` / `CoMultiGet()` entry points matching the `DB::Get()` / `MultiGet()` overloads. These helpers schedule native coroutine reads on the read executor and use the synchronous DB API when coroutine support or a read executor is unavailable. Use the stackable coroutine hooks for TTL and WritePrepared transaction reads. TTL preserves expiration decoding and timestamp behavior, while WritePrepared preserves transaction visibility. TTL keeps a single `DB` inheritance path while adding `CoroDB`: ``` DBWithTTLImpl `-- CoroStackableDBBase<DBWithTTL> |-- DBWithTTL -> StackableDB -> DB `-- CoroDB ``` `CoroDB::CoGet()` dispatches through the stackable coroutine hook and schedules the operation on the read EventBase. `CoMultiGet()` follows the same path: ``` CoroDB::CoGet(db, ...) |-- db->GetCoroDB() -> DBWithTTLImpl |-- no CoroDB or read executor -> db->Get() `-- schedule on read EventBase `-- virtual CoroDB::GetCoroutine() `-- DBWithTTLImpl::GetCoroutine() |-- CoroStackableDBBase<DBWithTTL>::GetCoroutine() | `-- wrapped CoroDB::GetCoroutine() `-- strip TTL timestamp ``` Reviewed By: xingbowang Differential Revision: D115232510 fbshipit-source-id: 59e5090db28d15bcff1a8b9b8c0b30ca7eeb742d
RocksDB: A Persistent Key-Value Store for Flash and RAM Storage
RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)
This code is a library that forms the core building block for a fast key-value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) and Space-Amplification-Factor (SAF). It has multi-threaded compactions, making it especially suitable for storing multiple terabytes of data in a single database.
Start with example usage here: https://github.com/facebook/rocksdb/tree/main/examples
See the github wiki for more explanation.
The public interface is in include/. Callers should not include or
rely on the details of any other header files in this package. Those
internal APIs may be changed without warning.
Questions and discussions are welcome on the RocksDB Developers Public Facebook group and email list on Google Groups.
License
RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.