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Posted to commits@servicecomb.apache.org by ni...@apache.org on 2017/12/12 09:18:18 UTC
[21/57] [partial] incubator-servicecomb-website git commit: Generated
the static pages for asf-site
http://git-wip-us.apache.org/repos/asf/incubator-servicecomb-website/blob/08e1b43f/content/developers/submit-codes/index.html
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+ }
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+ <meta itemprop="headline" content="代码提交指南">
+ <meta itemprop="description" content="介绍如何向 ServiceComb 项目提交代码">
+
+ <meta itemprop="dateModified" content="September 08, 2017">
+
+ <div class="page__inner-wrap">
+
+
+ <header>
+ <h1 class="page__title" itemprop="headline">代码提交指南
+</h1>
+
+ </header>
+
+
+
+ <section class="page__content" itemprop="text">
+ <aside class="sidebar__right">
+<nav class="toc">
+ <!-- <header><h4 class="nav__title"><i class="fa fa-file-text"></i> On This Page</h4></header> -->
+<ul class="toc__menu" id="markdown-toc">
+ <li><a href="#贡献途径" id="markdown-toc-贡献途径">贡献途径</a></li>
+ <li><a href="#运行测试" id="markdown-toc-运行测试">运行测试</a></li>
+ <li><a href="#pr指南" id="markdown-toc-pr指南">PR指南</a> <ul>
+ <li><a href="#fork仓库" id="markdown-toc-fork仓库">Fork仓库</a></li>
+ <li><a href="#配置git和提交修改" id="markdown-toc-配置git和提交修改">配置git和提交修改</a></li>
+ <li><a href="#创建pr" id="markdown-toc-创建pr">创建PR</a></li>
+ <li><a href="#冲突解决" id="markdown-toc-冲突解决">冲突解决</a></li>
+ </ul>
+ </li>
+</ul>
+
+ </nav>
+</aside>
+
+<h2 id="贡献途径">贡献途径</h2>
+<p> ServiceComb正在不断成长中，也希望能找到更多志同道合的同伴一起成长和进步。向ServiceComb 贡献的途径有多种：</p>
+<ul>
+ <li>完善文档。完善网站上的文档或者项目中的介绍文档和API说明文档。其中，网站文档的完善可通过网站最底端的<strong>报告本网页问题</strong>或<strong>在Github上编辑此页</strong>对文档内容进行完善。</li>
+ <li>
+ <p>实现功能特性需求或修复BUG。项目的功能特性需求或者已发现但未修复的BUG都会在项目中的issue处看到，以<a href="https://github.com/ServiceComb/saga/issues">Saga</a>项目为例，一般都会带有类似 <strong>enhancement</strong> 或类似 <strong>bug</strong> 的标签来说明这是功能需求还是BUG，读者可以结合自己的兴趣点来选择。此外，您也可以通过日常使用或阅读代码时发现BUG并以Issue的方式进行描述并针对该BUG提交PR，帮助我们进一步改进。同时，也欢迎您提出需求并在实现后提交PR。</p>
+
+ <p><img src="/assets/images/find-features-by-example.png" alt="寻觅功能需求示例" class="align-center" /></p>
+ </li>
+</ul>
+
+<h2 id="运行测试">运行测试</h2>
+<p> 在您提交代码前，请先按照项目README中说明的自动测试部分对代码的功能性和实现上的正确性进行验证。</p>
+
+<h2 id="pr指南">PR指南</h2>
+<p> 在 <a href="https://github.com/ServiceComb">Github</a> 上面可以很方便地提交 <a href="https://help.github.com/articles/about-pull-requests/">Pull Request (PR)</a>，下面将以本网站项目<a href="https://github.com/ServiceComb/ServiceComb.github.io">ServiceComb/ServiceComb.github.io</a> 为例（如果是其他项目，请替换项目名ServiceComb.github.io）。</p>
+
+<h3 id="fork仓库">Fork仓库</h3>
+
+<p> 进入 ServiceComb/ServiceComb.github.io 的 <a href="https://github.com/ServiceComb/ServiceComb.github.io">github 页面</a> ，点击右上角按钮 <code class="highlighter-rouge">Fork</code> 进行 Fork。</p>
+
+<p><img src="/assets/images/fork-repo.jpg" alt="体质指数应用运行界面" class="align-center" /></p>
+
+<h3 id="配置git和提交修改">配置git和提交修改</h3>
+
+<ul>
+ <li>
+ <p>将代码克隆到本地：</p>
+
+ <div class="language-shell highlighter-rouge"><pre class="highlight"><code>git clone https://github.com/<your_github_name>/ServiceComb.github.io.git
+</code></pre>
+ </div>
+
+ <p>注意：请将 <your_github_name> 替换为您的github名字。</p>
+ </li>
+</ul>
+
+<p> clone完成后，origin会默认指向github上的远程fork地址。</p>
+
+<ul>
+ <li>
+ <p>将 ServiceComb/ServiceComb.github.io 添加为本地仓库的远程分支 upstream：</p>
+
+ <div class="language-shell highlighter-rouge"><pre class="highlight"><code><span class="nb">cd </span>ServiceComb.github.io
+git remote add upstream https://github.com/ServiceComb/ServiceComb.github.io.git
+</code></pre>
+ </div>
+ </li>
+ <li>
+ <p>检查远程仓库设置：</p>
+
+ <div class="language-shell highlighter-rouge"><pre class="highlight"><code>git remote -v
+origin https://github.com/<your_github_name>/ServiceComb.github.io.git <span class="o">(</span>fetch<span class="o">)</span>
+origin https://github.com/<your_github_name>/ServiceComb.github.io.git <span class="o">(</span>push<span class="o">)</span>
+upstream https://github.com/ServiceComb/ServiceComb.github.io.git <span class="o">(</span>fetch<span class="o">)</span>
+upstream https://github.com/ServiceComb/ServiceComb.github.io.git <span class="o">(</span>push<span class="o">)</span>
+</code></pre>
+ </div>
+ </li>
+ <li>
+ <p>新建分支以便在分支上做修改：</p>
+
+ <div class="language-shell highlighter-rouge"><pre class="highlight"><code>git checkout -b <your_branch_name>
+</code></pre>
+ </div>
+ </li>
+</ul>
+
+<p> 注意： <your_branch_name> 为您自定义的分支名字。</p>
+
+<p> 创建完成后可进行代码更改。</p>
+
+<ul>
+ <li>
+ <p>提交代码到远程分支：</p>
+
+ <div class="language-shell highlighter-rouge"><pre class="highlight"><code>git commit -a -m <span class="s2">"<you_commit_message>"</span>
+git push origin <your_branch_name>
+</code></pre>
+ </div>
+ </li>
+</ul>
+
+<p> 更多 git 使用方法请访问：<a href="https://www.atlassian.com/git/tutorials/setting-up-a-repository">git 使用</a>，这里不赘述。</p>
+
+<h3 id="创建pr">创建PR</h3>
+
+<p> 在浏览器切换到自己的 github 页面，切换分支到提交的分支 <your_branch_name> ，依次点击 <code class="highlighter-rouge">New pull request</code> 和 <code class="highlighter-rouge">Create pull request</code> 按钮进行创建，如下图所示：</p>
+
+<p class="figure-caption"><img src="/assets/images/new-pr.jpg" alt="体质指数应用运行界面" class="align-center" />
+fig-1 New pull request</p>
+
+<p class="figure-caption"><img src="/assets/images/create-pr.jpg" alt="体质指数应用运行界面" class="align-center" />
+fig-2 Create pull request</p>
+
+<p> 至此，您的PR创建完成，更多关于 PR 请阅读 <a href="https://help.github.com/categories/collaborating-with-issues-and-pull-requests/">collaborating-with-issues-and-pull-requests</a> 。</p>
+
+<h3 id="冲突解决">冲突解决</h3>
+<p> 提交PR时的代码冲突一般是由于多人编辑同一个文件引起的，解决冲突主要通过以下步骤即可：</p>
+<ol>
+ <li>切换至主分支
+ <div class="language-bash highlighter-rouge"><pre class="highlight"><code>git checkout master
+</code></pre>
+ </div>
+ </li>
+ <li>同步远端主分支至本地
+ <div class="language-bash highlighter-rouge"><pre class="highlight"><code>git pull upstream master
+</code></pre>
+ </div>
+ </li>
+ <li>切换回刚才的分支（假设分支名为fix）
+ <div class="language-bash highlighter-rouge"><pre class="highlight"><code>git checkout fix
+</code></pre>
+ </div>
+ </li>
+ <li>进行rebase
+ <div class="language-bash highlighter-rouge"><pre class="highlight"><code>git rebase -i master
+</code></pre>
+ </div>
+ <p>此时会弹出修改记录的文件，一般直接保存即可。然后会提示哪些文件出现了冲突，此时可打开冲突文件对冲突部分进行修改，将提示的所有冲突文件的冲突都解决后，执行</p>
+ <div class="language-bash highlighter-rouge"><pre class="highlight"><code>git add .
+git rebase --continue
+</code></pre>
+ </div>
+ <p>依此往复，直至屏幕出现类似 <em>rebase successful</em> 字样即可，此时您可以进行往提交PR的分支进行更新：</p>
+ <div class="language-bash highlighter-rouge"><pre class="highlight"><code>git push -f origin fix
+</code></pre>
+ </div>
+ </li>
+</ol>
+
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+ <p class="header">Resources</p>
+ <li><a href="/docs/quick-start/">Quick Start</a></li>
+ <li><a href="/users/user-guide/">User Guide</a></li>
+ <li><a href="/slides/">Slides</a></li>
+ <li><a href="/users/faq/">Common Questions</a></li>
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+ <li><a href="https://github.com/ServiceComb/ServiceComb.github.io/issues/new?title=Issue with _developers/submit-codes.md">Report a Doc Issue</a></li>
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+ </li>
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http://git-wip-us.apache.org/repos/asf/incubator-servicecomb-website/blob/08e1b43f/content/docs/autoscale-on-company/index.html
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diff --git a/content/docs/autoscale-on-company/index.html b/content/docs/autoscale-on-company/index.html
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+<title>On-demand Resource Control for Micro-serviced Company by Autoscale - Apache incubator ServiceComb</title>
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+
+<meta name="description" content="This article introduces practice of using kubernetes autoscale in the micro-serviced Company demo to achieve on-demand resource control">
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+ <meta itemprop="description" content="This article introduces practice of using kubernetes autoscale in the micro-serviced Company demo to achieve on-demand resource control">
+ <meta itemprop="datePublished" content="August 24, 2017">
+
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+
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+ <header>
+ <h1 class="page__title" itemprop="headline">On-demand Resource Control for Micro-serviced Company by Autoscale
+</h1>
+
+ <p class="page__meta"><i class="fa fa-clock-o" aria-hidden="true"></i>
+
+
+
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+ 3 minute read
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+
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+ <section class="page__content" itemprop="text">
+ <p> <a href="/docs/company-on-kubernetes/">Last article</a> describes how to quickly deploy the Company demo on K8S. This article will continue to demonstrate the benefits of micro-service architecture, use auto-scale of K8S in Company to achieve on-demand fine-grained resources.</p>
+
+<h2 id="prepare">Prepare</h2>
+
+<h3 id="prepare-k8s-environment">Prepare K8S Environment</h3>
+
+<p>Install monitor Heapster and Grafana in K8S to enable auto-scale ability in K8S:</p>
+
+<p>Get one-click installing scripts in the <a href="https://github.com/zenlinTechnofreak/LinuxCon-Beijing-WorkShop/tree/autoscal/kubernetes/heapster/deploy">author’s repo</a>，update value of api-server as following and run kube.sh to start,</p>
+
+<div class="language-bash highlighter-rouge"><pre class="highlight"><code>vi LinuxCon-Beijing-WorkShop/kubernetes/heapster/deploy/kube-config/influxdb/heapster.yaml
+</code></pre>
+</div>
+
+<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">spec</span><span class="pi">:</span>
+ <span class="s">replicas</span><span class="pi">:</span> <span class="s">1</span>
+ <span class="s">template</span><span class="pi">:</span>
+ <span class="s">metadata</span><span class="pi">:</span>
+ <span class="s">labels</span><span class="pi">:</span>
+ <span class="s">task</span><span class="pi">:</span> <span class="s">monitoring</span>
+ <span class="s">k8s-app</span><span class="pi">:</span> <span class="s">heapster</span>
+ <span class="s">spec</span><span class="pi">:</span>
+ <span class="s">serviceAccountName</span><span class="pi">:</span> <span class="s">heapster</span>
+ <span class="s">containers</span><span class="pi">:</span>
+ <span class="pi">-</span> <span class="s">name</span><span class="pi">:</span> <span class="s">heapster</span>
+ <span class="s">image</span><span class="pi">:</span> <span class="s">gcr.io/google_containers/heapster-amd64:v1.4.1</span>
+ <span class="s">imagePullPolicy</span><span class="pi">:</span> <span class="s">IfNotPresent</span>
+ <span class="s">command</span><span class="pi">:</span>
+ <span class="pi">-</span> <span class="s">/heapster</span>
+<span class="c1">#use 'kubernetes' directly if installed inside the cluster</span>
+ <span class="pi">-</span> <span class="s">--source=kubernetes</span>
+<span class="c1">#use the practical api-server address if installed outside the cluster</span>
+<span class="c1"># - --source=kubernetes:http://10.229.43.65:6443?inClusterConfig=false</span>
+ <span class="pi">-</span> <span class="s">--sink=influxdb:http://monitoring-influxdb:8086</span>
+</code></pre>
+</div>
+
+<h3 id="start-company-demo">Start Company Demo</h3>
+
+<p>Download Company source code, restricted resources, creating auto-scaller,</p>
+
+<div class="language-shell highlighter-rouge"><pre class="highlight"><code>git clone https://github.com/ServiceComb/ServiceComb-Company-WorkShop.git
+
+<span class="nb">cd </span>LinuxCon-Beijing-WorkShop/kubernetes/
+
+bash start-autoscale.sh
+</code></pre>
+</div>
+
+<p>In Company’s deployment script, filed of resources is added to limit 200 milli-cores to each pod(1000 milli-cores equal to 1 core),</p>
+
+<div class="language-yaml highlighter-rouge"><pre class="highlight"><code> <span class="s">resources</span><span class="pi">:</span>
+ <span class="s">limits</span><span class="pi">:</span>
+ <span class="s">cpu</span><span class="pi">:</span> <span class="s">200m</span>
+</code></pre>
+</div>
+<p>In script start-autoscale.sh, each command create a Horizontal Pod Autoscaler that maintains between 1 and 10 replicas of the Pods controlled by its deployment created. HPA will increase and decrease the number of replicas (via the deployment) to maintain an average CPU utilization across all Pods of 50%(this means average CPU usage of 100 milli-cores),</p>
+
+<div class="language-shell highlighter-rouge"><pre class="highlight"><code><span class="c"># Create Horizontal Pod Autoscaler</span>
+kubectl autoscale deployment zipkin --cpu-percent<span class="o">=</span>50 --min<span class="o">=</span>1 --max<span class="o">=</span>10
+kubectl autoscale deployment company-bulletin-board --cpu-percent<span class="o">=</span>50 --min<span class="o">=</span>1 --max<span class="o">=</span>10
+kubectl autoscale deployment company-worker --cpu-percent<span class="o">=</span>50 --min<span class="o">=</span>1 --max<span class="o">=</span>10
+kubectl autoscale deployment company-doorman --cpu-percent<span class="o">=</span>50 --min<span class="o">=</span>1 --max<span class="o">=</span>10
+kubectl autoscale deployment company-manager --cpu-percent<span class="o">=</span>50 --min<span class="o">=</span>1 --max<span class="o">=</span>10
+kubectl autoscale deployment company-beekeeper --cpu-percent<span class="o">=</span>50 --min<span class="o">=</span>1 --max<span class="o">=</span>10
+</code></pre>
+</div>
+
+<p>HPA can be created after running start-autoscale.sh, get HPA status by the following command,</p>
+
+<div class="language-shell highlighter-rouge"><pre class="highlight"><code> kubectl get hpa
+</code></pre>
+</div>
+
+<h3 id="start-pressure-testing">Start Pressure Testing</h3>
+
+<div class="language-shell highlighter-rouge"><pre class="highlight"><code><span class="nb">export</span> <span class="nv">$HOST</span><span class="o">=</span><heapster-ip>:<heapster-port>
+bash LinuxCon-Beijing-WorkShop/kubernetes/stress-test.sh
+</code></pre>
+</div>
+
+<p>The script enable a dead loop, request to Company to calculate fibonacci number 200 times in each second, causing pressure on Company,</p>
+
+<div class="language-shell highlighter-rouge"><pre class="highlight"><code><span class="nv">FIBONA_NUM</span><span class="o">=</span><span class="sb">`</span>curl -s -H <span class="s2">"Authorization: </span><span class="nv">$Authorization</span><span class="s2">"</span> -XGET <span class="s2">"http://</span><span class="nv">$HOST</span><span class="s2">/worker/fibonacci/term?n=6"</span><span class="sb">`</span>
+</code></pre>
+</div>
+
+<h2 id="testing-result">Testing Result</h2>
+
+<p>Following datas gets from HPA and Grafana,</p>
+
+<p class="figure-caption"><img src="/assets/images/company-autoscale-1.png" alt="Fig 1" class="align-center" />
+Fig 1 HPA Data of Start-up Period</p>
+
+<p class="figure-caption"><img src="/assets/images/company-autoscale-2.png" alt="Fig 2" class="align-center" />
+Fig 2 Granfana Data of Start-up Period</p>
+
+<p class="figure-caption"><img src="/assets/images/company-autoscale-3.png" alt="Fig 3" class="align-center" />
+Fig 3 HPA Data of middle Period</p>
+
+<p class="figure-caption"><img src="/assets/images/company-autoscale-4.png" alt="Fig 4" class="align-center" />
+Fig 4 Granfana Data of The End</p>
+
+<p class="figure-caption"><img src="/assets/images/company-autoscale-5.png" alt="Fig 5" class="align-center" />
+Fig 5 HPA Data of The End</p>
+
+<p><strong>Analyze the data to get the results,</strong></p>
+
+<ol>
+ <li>
+ <p>Pressure is focused on the pod of company-manager, auto-scaler of K8S increase the pods to achieve goal, less than 50% of CPU usage limited(In fig 5, Usage default company-manager/Request default company-manager = 192/600 about equal to 33% in fig 4), keeping steady.</p>
+ </li>
+ <li>
+ <p>Before steady, auto-scaling may cause losing packages.</p>
+ </li>
+ <li>
+ <p>Company startup will cause temporarily increasing of the system resource load, so the CPU occupancy curve is showed like a crest-like, but HPA can accurately find the number of matching count of pods. In fig 3, count of pods has exceeded 3 which is actually required, and changed to 3 to keep the system steady.</p>
+ </li>
+ <li>
+ <p>The data of HPA and Granfana should be reported with some delay, official statement:</p>
+
+ <p>Starting and stopping pods may introduce noise to the metric (for instance, starting may temporarily increase CPU). So, after each action, the autoscaler should wait some time for reliable data. Scale-up can only happen if there was no rescaling within the last 3 minutes. Scale-down will wait for 5 minutes from the last rescaling. Moreover any scaling will only be made if:<code class="highlighter-rouge">avg(CurrentPodsConsumption) / Target</code> drops below 0.9 or increases above 1.1 (10% tolerance).</p>
+ </li>
+</ol>
+
+<p>It is all of the demonstrate above, anyway, Martin Fowler wrote in the <a href="https://martinfowler.com/articles/microservices.html">March 2014 article</a>:</p>
+<blockquote>
+ <p><em>“Microservices” - yet another new term on the crowded streets of software architecture. Although our natural inclination is to pass such things by with a contemptuous glance, this bit of terminology describes a style of software systems that we are finding more and more appealing. We’ve seen many projects use this style in the last few years, and results so far have been positive, so much so that for many of our colleagues this is becoming the default style for building enterprise applications. Sadly, however, there’s not much information that outlines what the microservice style is and how to do it.</em></p>
+</blockquote>
+
+<p>Mr. Wang Lei, the forerunner of domestic practice micro-service, also held a comprehensive discussion in the book “Micro Service Architecture and Practice”.</p>
+
+<p>Company based on ServiceComb, with micor-service properties, so we can doing fine-grained control to the single-load serivce Company-manager, to achieve the purpose of on-demand, this will greatly helpful to accurately and effectively solve the application bottlenecks, improve the efficiency of resource use.</p>
+
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+ <header>
+ <h1 class="page__title" itemprop="headline">Communication Between Service-Center and MicroServices
+</h1>
+
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+
+
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+ 1 minute read
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+ <p>Service-Center(<a href="https://github.com/ServiceComb/service-center">SC</a>) is a service registry that allows services to register their instance information and to discover providers of a given service.
+SC uses etcd to store all the information of micro-service and its instances. Below is the diagram stating the working principles and flow of SC.</p>
+
+<h4 id="on-startup">On StartUp</h4>
+<p>Here we assume that micro-services are written using <a href="https://github.com/ServiceComb/java-chassis">java-chassis</a> sdk. So when micro-service boots up then java-chassis sdk does the following list of tasks.</p>
+
+<ol>
+ <li>
+ <p>On startup provider registers the micro-service to SC if not registered earlier and also register its instance information like its Ip and Port on which instance is running.</p>
+ </li>
+ <li>
+ <p>SC stores the provider information in etcd.</p>
+ </li>
+ <li>
+ <p>On startup consumer retrieves the list of all provider instance from SC using the micro-service name of the provider.</p>
+ </li>
+ <li>
+ <p>Consumer sdk stores all the information of provider instances in its cache.</p>
+ </li>
+ <li>
+ <p>Consumer sdk creates a web socket connection to SC to watch all the provider instance information, if there is any change in the provider then sdk updates it’s cache information.</p>
+ </li>
+</ol>
+
+<p><img src="/assets/images/onStartup.PNG" alt="OnStartup" class="align-center" /></p>
+
+<h4 id="communication-between-consumer---provider">Communication between Consumer -> Provider</h4>
+<p>Once the bootup is successful then the consumer can communicate with providers flawlessly, below is the diagram illustrating the communication between provider and consumer.</p>
+
+<p><img src="/assets/images/communication.PNG" alt="Communication" class="align-center" /></p>
+
+<p>Provider instance regularly sends heartbeat signal every 30 seconds to SC, if SC does not recieve the heartbeat for particular instance then the information in etcd expires and the provider instance information is removed.<br />
+Consumer watches the information of provider instances from SC and if there is any change then the cache is updated.<br />
+When Consumer needs to communicate to Provider then consumer reads endpoints of the provider instances from cache and do loadbalancing to communicate to Provider.</p>
+
+
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