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| 4.7 只注册 |
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| 4.10 多注册中心 |
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| 4.11 服务分组 |
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| 4.13 多版本 |
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| 4.14 分组聚合 |
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| 4.15 参数验证 |
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| 4.16 结果缓存 |
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| 4.17 泛化引用 |
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| 4.18 泛化实现 |
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| 4.19 回声测试 |
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| 4.20 上下文信息 |
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| 4.21 隐式参数 |
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| 4.22 异步调用 |
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| 4.23 本地调用 |
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| 4.24 参数回调 |
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| 4.25 事件通知 |
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| 4.26 本地存根 |
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| 4.27 本地伪装 |
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| </a> |
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| 4.28 延迟暴露 |
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| <a href="并发控制.html"> |
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| 4.29 并发控制 |
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| </a> |
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| <li class="chapter " data-level="1.5.29" data-path="连接控制.html"> |
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| <a href="连接控制.html"> |
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| 4.30 连接控制 |
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| </a> |
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| <li class="chapter " data-level="1.5.30" data-path="延迟连接.html"> |
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| <a href="延迟连接.html"> |
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| 4.31 延迟连接 |
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| </a> |
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| <li class="chapter " data-level="1.5.31" data-path="粘滞连接.html"> |
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| 4.32 粘滞连接 |
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| </a> |
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| 4.33 令牌验证 |
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| </a> |
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| <a href="路由规则.html"> |
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| 4.34 路由规则 |
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| </a> |
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| <li class="chapter " data-level="1.5.34" data-path="配置规则.html"> |
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| <a href="配置规则.html"> |
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| 4.35 配置规则 |
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| </a> |
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| <a href="服务降级.html"> |
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| 4.36 服务降级 |
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| </a> |
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| 4.37 优雅停机 |
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| </a> |
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| <a href="主机绑定.html"> |
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| 4.38 主机绑定 |
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| </a> |
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| <a href="日志适配.html"> |
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| 4.39 日志适配 |
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| </a> |
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| <li class="chapter " data-level="1.5.39" data-path="访问日志.html"> |
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| <a href="访问日志.html"> |
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| 4.40 访问日志 |
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| </a> |
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| <a href="服务容器.html"> |
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| 4.41 服务容器 |
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| </a> |
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| <li class="chapter " data-level="1.5.41" data-path="ReferenceConfig缓存.html"> |
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| <a href="ReferenceConfig缓存.html"> |
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| 4.42 Reference Config缓存 |
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| </a> |
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| <a href="分布式事务.html"> |
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| 4.43 分布式事务 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.5.43" data-path="../reference-apiconf/api.html"> |
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| <a href="../reference-apiconf/api.html"> |
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| 5 API参考手册 |
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| </a> |
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| </li> |
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| </ul> |
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| </li> |
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| <li class="chapter " data-level="1.6" data-path="../reference-xmlconf/introduction.html"> |
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| <a href="../reference-xmlconf/introduction.html"> |
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| 5 schema配置参考手册 |
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| </a> |
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| <ul class="articles"> |
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| <li class="chapter " data-level="1.6.1" data-path="../reference-xmlconf/dubbo-service.html"> |
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| <a href="../reference-xmlconf/dubbo-service.html"> |
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| 5.1 dubbo:service |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.6.2" data-path="../reference-xmlconf/dubbo-reference.html"> |
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| <a href="../reference-xmlconf/dubbo-reference.html"> |
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| 5.2 dubbo:reference |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.6.3" data-path="../reference-xmlconf/dubbo-protocol.html"> |
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| <a href="../reference-xmlconf/dubbo-protocol.html"> |
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| 5.3 dubbo:protocol |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.6.4" data-path="../reference-xmlconf/dubbo-registry.html"> |
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| <a href="../reference-xmlconf/dubbo-registry.html"> |
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| 5.4 dubbo:registry |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.6.5" data-path="../reference-xmlconf/dubbo-monitor.html"> |
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| <a href="../reference-xmlconf/dubbo-monitor.html"> |
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| 5.5 dubbo:monitor |
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| </a> |
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| |
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| </li> |
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| <li class="chapter " data-level="1.6.6" data-path="../reference-xmlconf/dubbo-application.html"> |
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| <a href="../reference-xmlconf/dubbo-application.html"> |
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| 5.6 dubbo:application |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.6.7" data-path="../reference-xmlconf/dubbo-module.html"> |
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| <a href="../reference-xmlconf/dubbo-module.html"> |
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| 5.7 dubbo:module |
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| </a> |
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| |
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| </li> |
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| <li class="chapter " data-level="1.6.8" data-path="../reference-xmlconf/dubbo-provider.html"> |
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| <a href="../reference-xmlconf/dubbo-provider.html"> |
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| 5.8 dubbo:provider |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.6.9" data-path="../reference-xmlconf/dubbo-consumer.html"> |
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| <a href="../reference-xmlconf/dubbo-consumer.html"> |
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| 5.9 dubbo:consumer |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.6.10" data-path="../reference-xmlconf/dubbo-method.html"> |
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| 5.10 dubbo:method |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.6.11" data-path="../reference-xmlconf/dubbo-argument.html"> |
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| <a href="../reference-xmlconf/dubbo-argument.html"> |
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| 5.11 dubbo:argument |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.6.12" data-path="../reference-xmlconf/dubbo-parameter.html"> |
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| <a href="../reference-xmlconf/dubbo-parameter.html"> |
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| 5.12 dubbo:parameter |
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| </a> |
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| </li> |
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| </ul> |
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| <li class="chapter " data-level="1.7" data-path="../reference-protocol/introduction.html"> |
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| <a href="../reference-protocol/introduction.html"> |
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| 6 协议参考手册 |
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| </a> |
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| <ul class="articles"> |
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| <li class="chapter " data-level="1.7.1" data-path="../reference-protocol/dubbo.html"> |
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| <a href="../reference-protocol/dubbo.html"> |
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| 6.1 dubbo:// |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.2" data-path="../reference-protocol/rmi.html"> |
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| <a href="../reference-protocol/rmi.html"> |
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| 6.2 rmi// |
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| </a> |
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| <li class="chapter " data-level="1.7.3" data-path="../reference-protocol/hessian.html"> |
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| <a href="../reference-protocol/hessian.html"> |
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| 6.3 hessian:// |
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| </a> |
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| <li class="chapter " data-level="1.7.4" data-path="../reference-protocol/http.html"> |
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| <a href="../reference-protocol/http.html"> |
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| 6.4 http:// |
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| </a> |
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| <li class="chapter " data-level="1.7.5" data-path="../reference-protocol/webservice.html"> |
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| <a href="../reference-protocol/webservice.html"> |
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| 6.5 webservice:// |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.6" data-path="../reference-protocol/thrift.html"> |
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| <a href="../reference-protocol/thrift.html"> |
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| 6.6 thrift:// |
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| </a> |
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| <a href="../reference-protocol/memcached.html"> |
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| 6.7 memcached:// |
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| </a> |
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| <a href="../reference-protocol/redis.html"> |
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| 6.8 redis:// |
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| </a> |
| |
| |
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| </li> |
| |
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| </ul> |
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| |
| <li class="chapter " data-level="1.8" data-path="../reference-registry/introduction.html"> |
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| <a href="../reference-registry/introduction.html"> |
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| 7 注册中心参考手册 |
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| <li class="chapter " data-level="1.8.1" data-path="../reference-registry/multicast.html"> |
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| <a href="../reference-registry/multicast.html"> |
| |
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| 7.1 Multicast注册中心 |
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| 7.2 Zookeeper注册中心 |
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| <a href="../reference-registry/redis.html"> |
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| 7.3 Redis注册中心 |
| |
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| 7.4 Simple注册中心 |
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| <a href="../reference-telnet/telnet.html"> |
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| 8 telnet命令参考手册 |
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| 9 maven插件参考手册 |
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| 10 服务化最佳实践 |
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| 11 推荐用法 |
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| 12 容量规划 |
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| 13 基准测试工具包 |
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| 14 性能测试报告 |
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| <a href=".." >4.3 负载均衡</a> |
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| <p><img src="../sources/images/check.gif" alt="warning">在集群负载均衡时,Dubbo提供了多种均衡策略,缺省为random随机调用。可以自行扩展负载均衡策略,参见:<a href="dev-guide-spi-reference-manual#负载均衡扩展">负载均衡扩展</a></p> |
| </blockquote> |
| <h5 id="random-loadbalance">Random LoadBalance</h5> |
| <ul> |
| <li>随机,按权重设置随机概率。</li> |
| <li>在一个截面上碰撞的概率高,但调用量越大分布越均匀,而且按概率使用权重后也比较均匀,有利于动态调整提供者权重。</li> |
| </ul> |
| <h5 id="roundrobin-loadbalance">RoundRobin LoadBalance</h5> |
| <ul> |
| <li>轮循,按公约后的权重设置轮循比率。</li> |
| <li>存在慢的提供者累积请求的问题,比如:第二台机器很慢,但没挂,当请求调到第二台时就卡在那,久而久之,所有请求都卡在调到第二台上。</li> |
| </ul> |
| <h5 id="leastactive-loadbalance">LeastActive LoadBalance</h5> |
| <ul> |
| <li>最少活跃调用数,相同活跃数的随机,活跃数指调用前后计数差。</li> |
| <li>使慢的提供者收到更少请求,因为越慢的提供者的调用前后计数差会越大。</li> |
| </ul> |
| <h5 id="consistenthash-loadbalance">ConsistentHash LoadBalance</h5> |
| <ul> |
| <li>一致性Hash,相同参数的请求总是发到同一提供者。</li> |
| <li>当某一台提供者挂时,原本发往该提供者的请求,基于虚拟节点,平摊到其它提供者,不会引起剧烈变动。</li> |
| <li>算法参见:<a href="http://en.wikipedia.org/wiki/Consistent_hashing。" target="_blank">http://en.wikipedia.org/wiki/Consistent_hashing。</a></li> |
| <li>缺省只对第一个参数Hash,如果要修改,请配置<code><dubbo:parameter key="hash.arguments" value="0,1" /></code></li> |
| <li>缺省用160份虚拟节点,如果要修改,请配置 <code><dubbo:parameter key="hash.nodes" value="320" /></code></li> |
| </ul> |
| <p>配置如:</p> |
| <pre><code class="lang-xml"><span class="hljs-tag"><<span class="hljs-name">dubbo:service</span> <span class="hljs-attr">interface</span>=<span class="hljs-string">"..."</span> <span class="hljs-attr">loadbalance</span>=<span class="hljs-string">"roundrobin"</span> /></span> |
| </code></pre> |
| <p>或</p> |
| <pre><code class="lang-xml"><span class="hljs-tag"><<span class="hljs-name">dubbo:reference</span> <span class="hljs-attr">interface</span>=<span class="hljs-string">"..."</span> <span class="hljs-attr">loadbalance</span>=<span class="hljs-string">"roundrobin"</span> /></span> |
| </code></pre> |
| <p>或</p> |
| <pre><code class="lang-xml"><span class="hljs-tag"><<span class="hljs-name">dubbo:service</span> <span class="hljs-attr">interface</span>=<span class="hljs-string">"..."</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">dubbo:method</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"..."</span> <span class="hljs-attr">loadbalance</span>=<span class="hljs-string">"roundrobin"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">dubbo:service</span>></span> |
| </code></pre> |
| <p>或</p> |
| <pre><code class="lang-xml"><span class="hljs-tag"><<span class="hljs-name">dubbo:reference</span> <span class="hljs-attr">interface</span>=<span class="hljs-string">"..."</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">dubbo:method</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"..."</span> <span class="hljs-attr">loadbalance</span>=<span class="hljs-string">"roundrobin"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">dubbo:reference</span>></span> |
| </code></pre> |
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