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| <label for=m-enoverviewnoticeslog4j-check><a href=/en/overview/notices/log4j/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enoverviewnoticeslog4j><span>Log4j vulnerability impact</span></a></label></li></ul></li></ul></li></ul></nav></div></div><main class="col-12 col-md-9 col-xl-8 pl-md-5" role=main><nav aria-label=breadcrumb class=td-breadcrumbs><ol class=breadcrumb><li class=breadcrumb-item><a href=https://cn.dubbo.apache.org/en/overview/>Overview</a></li><li class=breadcrumb-item><a href=https://cn.dubbo.apache.org/en/overview/tasks/>Tasks</a></li><li class=breadcrumb-item><a href=https://cn.dubbo.apache.org/en/overview/tasks/ecosystem/>Microservice Governance</a></li><li class="breadcrumb-item active" aria-current=page><a href=https://cn.dubbo.apache.org/en/overview/tasks/ecosystem/rate-limit/ aria-disabled=true class="btn-link disabled">Current limit downgrade</a></li></ol></nav><div class=td-content><h1>Current Limit Downgrade</h1><div class=lead>Use Sentinel to protect your application from stability issues caused by sudden traffic overload of individual services.</div><header class=article-meta></header><h2 id=what-is-sentinel>What is Sentinel</h2><p>With the popularity of microservices, the stability between services and services has become more and more important. Sentinel is a traffic management component for distributed, multilingual and heterogeneous service architectures. It mainly uses traffic as the entry point, from traffic routing, traffic control, traffic shaping, fuse downgrade, system adaptive overload protection, hotspot traffic protection, etc. dimensions to help developers ensure the stability of microservices.</p><h2 id=1-example-architecture-description>1. Example architecture description</h2><p>Interface definition:</p><div class=highlight><pre tabindex=0 style=color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-java data-lang=java><span style=display:flex><span><span style=color:#268bd2>public</span> <span style=color:#268bd2>interface</span> <span style=color:#268bd2>FooService</span> { |
| </span></span><span style=display:flex><span> |
| </span></span><span style=display:flex><span> String <span style=color:#268bd2>sayHello</span>(String name); |
| </span></span><span style=display:flex><span>} |
| </span></span></code></pre></div><p>Interface implementation:</p><div class=highlight><pre tabindex=0 style=color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-java data-lang=java><span style=display:flex><span><span style=color:#268bd2>@DubboService</span>(timeout <span style=color:#719e07>=</span> 3000) |
| </span></span><span style=display:flex><span><span style=color:#268bd2>public</span> <span style=color:#268bd2>class</span> <span style=color:#268bd2>FooServiceImpl</span> <span style=color:#268bd2>implements</span> FooService { |
| </span></span><span style=display:flex><span> |
| </span></span><span style=display:flex><span> <span style=color:#268bd2>@Override</span> |
| </span></span><span style=display:flex><span> <span style=color:#268bd2>public</span> String <span style=color:#268bd2>sayHello</span>(String name) { |
| </span></span><span style=display:flex><span> <span style=color:#719e07>return</span> String. <span style=color:#268bd2>format</span>(<span style=color:#2aa198>"Hello, %s at %s"</span>, name, LocalDateTime. <span style=color:#268bd2>now</span>()); |
| </span></span><span style=display:flex><span> } |
| </span></span><span style=display:flex><span>} |
| </span></span></code></pre></div><p>Current limiting configuration:</p><div class=highlight><pre tabindex=0 style=color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-java data-lang=java><span style=display:flex><span>FlowRule flowRule <span style=color:#719e07>=</span> <span style=color:#719e07>new</span> FlowRule(FooService. <span style=color:#268bd2>class</span>. <span style=color:#268bd2>getName</span>()) |
| </span></span><span style=display:flex><span> .setCount(10) |
| </span></span><span style=display:flex><span> .setGrade(RuleConstant.FLOW_GRADE_QPS); |
| </span></span><span style=display:flex><span>FlowRuleManager. <span style=color:#268bd2>loadRules</span>(Collections. <span style=color:#268bd2>singletonList</span>(flowRule)); |
| </span></span></code></pre></div><h2 id=2-quick-start-example>2. Quick start example</h2><h3 id=step-1-download-the-source-code>Step 1: Download the source code</h3><div class=highlight><pre tabindex=0 style=color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-shell data-lang=shell><span style=display:flex><span>git clone -b master https://github.com/apache/dubbo-samples.git |
| </span></span><span style=display:flex><span><span style=color:#b58900>cd</span> ./dubbo-samples-sentinel/ |
| </span></span></code></pre></div><h3 id=step-2-build-use-cases>Step 2: Build use cases</h3><p>Execute the maven command to package the demo project</p><div class=highlight><pre tabindex=0 style=color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-bash data-lang=bash><span style=display:flex><span>mvn clean package |
| </span></span></code></pre></div><h3 id=step-3-start-provider>Step 3: Start Provider</h3><div class=highlight><pre tabindex=0 style=color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-java data-lang=java><span style=display:flex><span>java <span style=color:#719e07>-</span>classpath .<span style=color:#719e07>/</span>target<span style=color:#719e07>/</span>dubbo<span style=color:#719e07>-</span>samples<span style=color:#719e07>-</span>sentinel<span style=color:#719e07>-</span>1.0<span style=color:#719e07>-</span>SNAPSHOT.jar org.apache.samples.sentinel.FooProviderBootstrap |
| </span></span></code></pre></div><h3 id=step-4-start-orderservice>Step 4: Start OrderService</h3><div class=highlight><pre tabindex=0 style=color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-java data-lang=java><span style=display:flex><span>java <span style=color:#719e07>-</span>classpath .<span style=color:#719e07>/</span>target<span style=color:#719e07>/</span>dubbo<span style=color:#719e07>-</span>samples<span style=color:#719e07>-</span>sentinel<span style=color:#719e07>-</span>1.0<span style=color:#719e07>-</span>SNAPSHOT.jar org.apache.samples.sentinel.FooConsumerBootstrap |
| </span></span></code></pre></div><p>You can see that in the console output, <code>Blocked</code> means that blocking has started.</p><div class=highlight><pre tabindex=0 style=color:#93a1a1;background-color:#002b36;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-fallback data-lang=fallback><span style=display:flex><span>Success: Hello, dubbo at 2022-08-08T15:42:40.809 |
| </span></span><span style=display:flex><span>Success: Hello, dubbo at 2022-08-08T15:42:40.812 |
| </span></span><span style=display:flex><span>Success: Hello, dubbo at 2022-08-08T15:42:40.815 |
| </span></span><span style=display:flex><span>Success: Hello, dubbo at 2022-08-08T15:42:40.818 |
| </span></span><span style=display:flex><span>Success: Hello, dubbo at 2022-08-08T15:42:40.821 |
| </span></span><span style=display:flex><span>Success: Hello, dubbo at 2022-08-08T15:42:40.823 |
| </span></span><span style=display:flex><span>Success: Hello, dubbo at 2022-08-08T15:42:40.826 |
| </span></span><span style=display:flex><span>Success: Hello, dubbo at 2022-08-08T15:42:40.828 |
| </span></span><span style=display:flex><span>Success: Hello, dubbo at 2022-08-08T15:42:40.830 |
| </span></span><span style=display:flex><span>Success: Hello, dubbo at 2022-08-08T15:42:40.834 |
| </span></span><span style=display:flex><span>Blocked |
| </span></span><span style=display:flex><span>Blocked |
| </span></span><span style=display:flex><span>Blocked |
| </span></span><span style=display:flex><span>Blocked |
| </span></span><span style=display:flex><span>Blocked |
| </span></span></code></pre></div><blockquote><p>For more usage methods of Sentinel, please refer to: <a href=/zh-cn/blog/2018/07/27/sentinel-%E4%B8%BA-dubbo-%E6%9C%8D%E5%8A%A1%E4%BF%9D%E9%A9%BE%E6%8A%A4%E8%88%AA/>Sentinel escorts Dubbo services</a>, <a href=https://sentinelguard.io/zh-cn/index.html>Sentinel official website</a></p></blockquote><div id=pre-footer><h2>Feedback</h2><p class=feedback--prompt>Was this page helpful?</p><button class="btn btn-primary mb-4 feedback--yes">Yes</button> |
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