<实践>Voldemort与Objot集成的WAP高性能议案与简单实现（一）

<实践>Voldemort与Objot集成的WAP高性能方案与简单实现（一）
［摘要］

Voldemort：高性能、高扩展性、不错的一致性Key-Value集群方案，目前被LinkIn使用，与Dynamo思想类似，参见http://project-voldemort.com
Objot：面向服务的轻量级web开发库，参见http://objot.com

［目标］

搭建一个WAP游戏开发框架，利用烂服务器集群提供高性能，尽量保证游戏数据的一致性，并可根据负载情况随时进行扩展，同时能够通过配置来调节各服务器利用率。
尽可能减少网络传输，单服务器既包含WEB也包含DB节点。

［技术选型］

1、游戏中不需要复杂的查询，因此抛弃了SQL数据库而使用Key-Value存储；通过对各种数据库的了解，发现Voldemort更适合，能保证目标。采用其Server Routing模式，不将WEB与DB在物理上划开。
2、Spring过于臃肿，故采用更加轻量级的Objot，同时Objot基于Java5，配置更简洁。
3、采用JSTL ＋ JSP处理页面数据。
4、采用Tomcat作为WEB容器。


［实现］（以单数据库节点为例）
1、在Servlet中启动Voldemort服务器
cluster.xml //Voldemort集群配置文件

<cluster><name>vortex</name><server><id>0</id><host>localhost</host><http-port>8081</http-port><socket-port>6666</socket-port><partitions>0, 1</partitions></server></cluster>

server.properties //Voldemort节点服务器配置

# The ID of *this* particular cluster nodenode.id=0max.threads=100############### DB options #######################不需要HTTP服务，Server Routing Mode必须开启sockethttp.enable=falsesocket.enable=true# 采用BDB存储bdb.write.transactions=falsebdb.flush.transactions=falsebdb.cache.size=256M#NIO connector settings.enable.nio.connector=falsestorage.configs=voldemort.store.bdb.BdbStorageConfiguration, voldemort.store.readonly.ReadOnlyStorageConfiguration

stores.xml //存储方式配置

<stores>  <store>    <name>vortex</name>    <persistence>bdb</persistence>    <routing>server</routing>    <replication-factor>1</replication-factor>    <required-reads>1</required-reads>    <required-writes>1</required-writes>    <key-serializer>      <type>identity</type>    </key-serializer>    <value-serializer>      <type>identity</type>    </value-serializer>  </store></stores>

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app>...<servlet><servlet-name>vortex-servlet</servlet-name><servlet-class>vortex.VortexServlet</servlet-class>                <!-- Voldemort家目录：）--><init-param><param-name>voldemort-home</param-name><param-value>/home/nkadun/vortex/voldemort</param-value></init-param><load-on-startup>0</load-on-startup></servlet><servlet-mapping><servlet-name>vortex-servlet</servlet-name><url-pattern>/service/*</url-pattern></servlet-mapping>...</web-app>

VortexServlet.java

public class VortexServlet implements Servlet {...private final String VOLDEMORT_HOME_KEY = "voldemort-home";private VoldemortServer server;private StoreRepository respository;private ServiceHandler handler;@Overridepublic void destroy() {logger.info("Shutdown voldemort server...");if(server != null)server.stop();logger.info("Shutdown voldemort server successfully.");}@Overridepublic void init(ServletConfig c) throws ServletException {config = c;handler = new ServiceHandler();try {logger.info("Starting voldemort server...");String voldemortHome = c.getInitParameter(VOLDEMORT_HOME_KEY);server = new VoldemortServer(VoldemortConfig.loadFromVoldemortHome(voldemortHome));//启动Voldemort服务器server.start();respository = ((StorageService)server.getService(ServiceType.STORAGE)).getStoreRepository();logger.info("Voldemort server started.");handler.init(respository);}catch(ConfigurationException e) {logger.info("Error occurred:", e);throw e;}catch(Exception e) {logger.error("Error occurred:", e);throw new ServletException(e);}}@Overridepublic void service(ServletRequest request, ServletResponse response) throws ServletException, IOException {try {String page = handler.handle(request, response);forward(page, request, response);}catch(Exception e) {throw new ServletException(e);}}...}

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