A Bitcask-like log-structured key-value store with an in-memory index, written in Rust
Link to the blog
- Clone and install the project
git clone https://github.com/anirudhsudhir/hobbes.git
cargo install --path .- Start the server
./hobbes-server -h
Usage: hobbes-server [OPTIONS]
Options:
--addr <addr> set the server endpoint [default: 127.0.0.1:4000]
--engine <engine> set the storage engine [default: hobbes] [possible values: hobbes, sled]
-h, --help Print help
-V, --version Print version
hobbes-server- Use the client to issue commands to the server
./hobbes -h
A Bitcask-like log structured key-value store written in Rust
Usage: hobbes [OPTIONS] <COMMAND>
Commands:
get return the value associated with a key
set store a key-value pair
rm delete a key-value pair from the store
help Print this message or the help of the given subcommand(s)
Options:
--addr <addr> set the endpoint to connect to [default: 127.0.0.1:4000]
-h, --help Print help
-V, --version Print version
hobbes set foo bar
hobbes get foo
hobbes rm foo- Single mutable and multiple immutable logs: The store uses the Bitcask architecture. At any instance, the storage directory contains a mutable write-ahead log as well as several immutable logs
- Log Compaction: The store compacts logs when the filesize hits a certain threshold for efficient disk utilisation
Hobbes offers pluggable storage backends. Currently, there are two choices:
- hobbes: The default engine with a Bitcask-like architecture, built from scratch
- sled: An alternate production engine with features such as ACID transactions (Github)
The key-value store is a server that listens for commands on the specified address. You may use a tool such as netcat instead of the hobbes client to send commands
echo "GET\rfoo\r\n" | nc localhost 4000
echo "SET\r<key>\r<val>\r\n" | nc <addr> <port>
echo "RM\r<key>\r\n" | nc <addr> <port>The command and arguments are separated by a carriage return (CR)(\r), with a
terminating newline (\n)