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Apache-2.0

hydrogen-ssdb

Java 编写的 SSDB 客户端

(底层架构已经完成,正在补充一些具体的命令)

介绍

hydrogen-ssdb 是一个 Java 编写的 SSDB 客户端,支持多线程并发请求和多服务器的负载均衡(客户端分发请求)。

SSDB 是一个类似 Redis 的 NOSQL 数据库,兼容 Redis 协议,且内容占用小。

hydrogen-ssdb 是一个 SSDB 客户端,具有以下特性:

  1. 易于配置,易于使用;
  2. 支持 SSDB 主从集群与负载均衡;
  3. 当集群中的服务器 down 掉时,能自动识别并跳过该服务器。

更多特性正在添加当中。

【负载均衡的拓扑架构】

Cluster 是负载均衡的顶层单位,每个 Cluster 包含多个 Server,一个 Server 可以是主服务器,也可以是从服务器,但 Cluster 中必须要有主服务器。

####【单点故障】

在负载均衡当中,每个节点都负责整个一致性哈希环中的一部分(称为哈希段)。当负载均衡当中出现单点故障时,故障节点对应的哈希段将无法执行存取操作,因此有两种处理方式:

  1. 故障节点前面的节点自动接管该哈希段。这种方式适用于将 SSDB 用于缓存,因为缓存丢失是可以重新填充的;
  2. 保留哈希段的故障状态,直到故障节点恢复。这种方式适用于将 SSDB 用于数据库,这样能严格保证一个 key 会保存在对应的节点中。

(hydrogen-ssdb 将会允许客户端选择使用这两种处理方式中的任意一种,该特性正在实现当中)

##项目依赖

hydrogen-ssdb 依赖于下面两个框架:

  • Apache commons-pool2 (对象池框架)
  • slf4j (日志框架)

##使用方法

基本使用方法

SsdbClient client = new SsdbClient(host, port);
client.set("key", "value");
System.out.println(client.get("key"));   // output "value"
client.close();    // 应用停止时需要调用 close() 方法,也可以配置在 Spring 的 destroy-method 中

配置主从服务器

List<Server> servers = Arrays.asList(
        new Server("192.168.1.180", 8888, null, true),  // 主服务器
        new Server("192.168.1.180", 8889, null, false)  // 从服务器
);

SsdbClient client = new SsdbClient(Sharding.fromServerList(servers));
client.set("name", "hydrogen-ssdb");    // 写入请求一定会发送给主服务器
System.out.println(client.get("name")); // 读取请求会随机发送给任意一台服务器

配置负载均衡

Sharding sharding = new Sharding(Arrays.asList(
        new Cluster(new Server("192.168.1.180", 8888), 100),  // 100 和 200 这两个参数指的是权重,
        new Cluster(new Server("192.168.1.180", 8889), 200)   // 权重越大的 Cluster 所保存的 key 越多。
));

SsdbClient ssdbClient = new SsdbClient(sharding);

Spring XML 配置

<!-- 单个 SSDB 服务器的配置,其他几个类似的构造方法在此略去 -->
<bean id="singleServerSsdbClient" class="com.hyd.ssdb.SsdbClient" destroy-method="close">
    <constructor-arg name="host" value="192.168.1.180"/>
    <constructor-arg name="port" value="8888"/>
</bean>

<!-- 多台 SSDB 主从服务器的配置 -->
<bean id="ssdbServer1" class="com.hyd.ssdb.conf.Server">
    <property name="host" value="192.168.1.180"/>
    <property name="port" value="8888"/>
    <property name="master" value="true"/>
</bean>
<bean id="ssdbServer2" class="com.hyd.ssdb.conf.Server">
    <property name="host" value="192.168.1.180"/>
    <property name="port" value="8889"/>
    <property name="master" value="false"/>
</bean>
<bean id="singleClusterSsdbClient" class="com.hyd.ssdb.SsdbClient"
      factory-method="fromSingleCluster" destroy-method="close">
    <constructor-arg name="servers">
        <list value-type="com.hyd.ssdb.conf.Server">
            <ref bean="ssdbServer1"/>
            <ref bean="ssdbServer2"/>
        </list>
    </constructor-arg>
</bean>

<!-- 多台 SSDB 负载均衡的配置(每个 Cluster 一台服务器) -->
<bean id="ssdbCluster1" class="com.hyd.ssdb.conf.Cluster" factory-method="fromSingleServer">
    <constructor-arg name="server" ref="ssdbServer1"/>
</bean>
<bean id="ssdbCluster2" class="com.hyd.ssdb.conf.Cluster" factory-method="fromSingleServer">
    <constructor-arg name="server" ref="ssdbServer2"/>
</bean>
<bean id="shardingSsdbClient" class="com.hyd.ssdb.SsdbClient"
      factory-method="fromClusters" destroy-method="close">
    <constructor-arg name="clusters">
        <list value-type="com.hyd.ssdb.conf.Cluster">
            <ref bean="ssdbCluster1"/>
            <ref bean="ssdbCluster2"/>
        </list>
    </constructor-arg>
</bean>

使用注意

线程安全

SsdbClient 对象包含了对整个负载均衡的拓扑结构的处理,所以对于每一个由多个 SSDB 服务器组成的负载均衡架构,只需创建一个 SsdbClient 对象即可。另外 SsdbClient 是线程安全的,所以可以让任意多个线程访问。

内存溢出

因为一个 SsdbClient 对象可能包含一个或多个连接池(每个连接池对应一个 SSDB 服务器),因此请不要创建大量的 SsdbClient 对象,这样完全没有必要,也会使得内存很容易被用光。

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