QConf

Introduction 中文

QConf is a Distrubuted Configuration Management System! A better replacement of the traditional configuration file. As designed, configuration items which is constantly accessed and modified should be completely separated with application code, and QConf is where it should be.

Features

• Changes to any configuration will be synchronised to all client machines in real-time.
• High query efficiency.
• Convenient deployment and simple interface.
• High robustness and fault-tolerance.
• support c/c++, shell, php, python, lua and etc.

Install

The QConf is built using CMake (version 2.6 or newer).

On most systems you can build the library using the following commands:

mkdir build && cd build
cmake ..
make
make install

Alternatively you can also point the CMake GUI tool to the CMakeLists.txt file.

To install the QConf you can specify the install prefix by setting:

cmake .. -DCMAKE_INSTALL_PREFIX=/install/prefix

Usage

• Set up Zookeeper servers, create or modify znode with Zookeeper Client

  More information about Zookeper: ZooKeeper Getting Started Guide

• Register the Zookeeper server address with QConf

vi QCONF_INSTALL_PREFIX/conf/idc.conf

  # all the zookeeper host configuration.
  #[zookeeper]
  zookeeper.test=127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:2183 #zookeeper of idc 'test'

• Assign local idc

echo test > QCONF_INSTALL_PREFIX/conf/localidc #assign local idc to 'test'

• Run QConf

cd QCONF_INSTALL_PREFIX/bin && sh agent-cmd.sh start

• Code to access QConf

Performance

1. statergy

• running times : ten million times altogether
• data size : the size of value of each key is 1k
• test method : multi-processes are running at the same time, and get the elapsed time that ten million times are running
• machine : Intel(R) Xeon(R) CPU E5-2630 0 @ 2.30GHz, 24 cores; 64G memory
• language : c++

2. result

• 

3. conclusion:

• the lantency is 16μs
• during multi-process, the QPS can reach one million

Example

	  // Init the qconf env
      ret = qconf_init();
      assert(QCONF_OK == ret);

      // Get Conf value
      char value[QCONF_CONF_BUF_MAX_LEN];
      ret = qconf_get_conf("/demo/node1", value, sizeof(value), NULL);
      assert(QCONF_OK == ret);
      
      // Destroy qconf env
      qconf_destroy();

Document

• Getting Started - a tutorial-style guide for developers to install, run, and program to QConf
• wiki

Contact

• Email: g-qconf@list.qihoo.net
• QQ Group: 438042718