GodBee

• GodBee
  • Overview
  • Architecture
  • Requirements
  • Methods supported
  • Build
  • Run
  • Test
    • Test CLI
    • Run unit tests
  • Benchmark
  • Documentation
  • Acknowledgements

Overview

GodBee is a Key-Value Store Service project. In this project, we choose B-Tree and B+Tree data structures to organize and manipulate data. Key-Value Storage is written in C++ and Service layer is written in Golang programming language. We use gRPC services to handle requests from client and use CGO to access data from C++ storage.

Architecture

Requirements

• C++17
• Golang 1.13.1
• Locust
• Python 3.7.3
• Docker Engine - Community 19.03.3

Methods supported

syntax = "proto3";

package service;

service KeyValueStoreService {
    rpc Connect (ConnectionRequest) returns (MessageResponse){}
    rpc Disconnect (DisconnectRequest) returns (MessageResponse) {}
    rpc Get (GetRequest) returns (GetResponse) {}
    rpc Set (SetRequest) returns (MessageResponse) {}
    rpc Remove (RemoveRequest) returns (RemoveResponse) {}
    rpc Exist (ExistRequest) returns (ExistResponse) {}
}

Build

# Clone project
git clone https://github.com/zalopay-oss/godbee.git

Run

• Make CGO understands C++17

# Modify Go enviroment variable
export CGO_CXXFLAGS="-g -rdynamic -std=c++17 -o -pthread

• Run server:

# Run server
./server.sh

• Or run Docker server:

# Build docker image named "godbee-server"
docker build -t godbee-server .

# Run image
docker run -it --net="host" godbee-server

Test

Test CLI

After run server, you can use GodBee-CLI to send commands to GodBee, and read the replies sent by the server, directly from the terminal.

Run CLI:

# Build and run client
./cli.sh

Command line usage:

• Connect to B/B+ Storage:

# CONNECT {B | BPLUS}
GodBee > CONNECT B
OK

• Disconnect to the storage:

# CLOSE
GodBee > CLOSE
OK

• Insert new Key-Value:

# SET key value
GodBee > SET a a
OK

• Get value from key:

# GET key
GodBee > GET a
"a"

• Remove key:

# {REMOVE|DEL} key
GodBee > DEL a
OK

• Check whether key exists in storage or not.

# EXIST key
GodBee > EXIST a
FALSE

• Exit program

GodBee > exit
Bye bye!!! Beeeeee~

Run unit tests

# Run test
./test.sh

Benchmark

You can view benchmark results at here.

Benchmark system:

• ThinkPad X280
• CPU: Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz
• 16GiB SODIMM DDR4 2400 MHz

P99 overview (miliseconds)

Percentile	Storage	Exist	Get	Remove	Set
50%	B-Store	20	19	88	110
	B+Store	21	20	87	110
99%	B-Store	36	35	270	270
	B+Store	39	37	250	270
100%	B-Store	71	59	880	1000
	B+Store	77	75	810	1000

Documentation

• Slide: B+ Tree, GodBee
• Blog:
  • Implement Key-Value Storage using Golang and C++ pt.1
  • Implement Key-Value Storage using Golang and C++ pt.2

Acknowledgements

Thanks AJ Pham for guiding us during the project.