Mongongo

Cassandra in Go.

Getting Started

• Install Go 1.15
• Enable Go module and Setup Go package proxy

$ go env -w GO111MODULE=on
$ go env -w GOPROXY=https://goproxy.io,direct

• Download

First setup your Go project structure, put the following into your ~/.bashrc:

export GOPATH=~/projects/go  # any where you like, except $GOROOT
export mg=$GOPATH/src/github.com/DistAlchemist

Then make directories:

$ mkdir -p $mg
$ cd $mg
$ git clone https://github.com/DistAlchemist/Mongongo.git
# or git clone [email protected]:DistAlchemist/Mongongo.git
$ cd Mongongo

• Setup tmux for multi-terminal (recommended)

$ sudo apt install tmux

• Create a new session of tmux:

$ tmux new -s mg

• Build files:

$ cd $mg
$ cd Mongongo
$ make

• Inside one terminal, run Mongongo server:

$ bin/mg-server

• Inside another terminal, run command line interface:

$ bin/cli 

• To start servers on multiple nodes:

$ sudo chmod +x startallpeers.sh
$ ./startallpeers.sh 

• To stop servers on multiple nodes:

$ sudo chmod +x stopallpeers.sh
$ ./stopallpeers.sh

Design

• The design mostly follows the very early version of Cassandra

• Currently only simple SET and GET operation is supported:

 SET table1.standardCF1['row1']['column1']='value' 
 GET table1.standardCF1['row1']['column1'] 

• The project is roughly divided into three layers:

  • Command Line Interface (parse SQL to command)
  • Mongongo Server (determine which nodes need to perform the operation, send the operation to their storage layer)
  • Storage Layer (perform specific operation, update commitLog, memTable, ssTable etc.)

• TODO

  • Add more tests.
  • Strengthen QL support.

Contributing

• See CONTRIBUTING

Example

License

MIT License