Cask-db
Caskdb is a C++20 implementation of bitcask
How it works
Caskdb is an on-disk log-structured hash table, log-structured means the underlying file is an append-only log while hash table points to the data storage interface (keys and values).
When a key, value pair is stored the key is indexed in an in-memory hashmap, the entries stored in-memory store all metadata that allows fetching the serialized on-disk bytes representing the value.
Because re-indexing everytime is costly this can be improved with an on-disk hint file that can be used to re-built the index at runtime.
Usage
Note : Caskdb uses various C++20 features such as std::optional so you will need a C++20
compliant compiler.
$ mkdir build
$ cd build/
$ cmake ..
$ make