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menu__caret"></button></div></li></ul></nav></div></div></aside><main class="docMainContainer_gTbr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/3.2.x/developers-landing/"><span itemprop="name">Development</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Simulation tools</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 3.2.x</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Simulation tools</h1></header><p>It is sometimes necessary to create a test environment and incur artificial load to observe how well load managers |
| handle the load. The load simulation controller, the load simulation client, and the broker monitor were created as an |
| effort to make create this load and observe the effects on the managers more easily.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="simulation-client">Simulation Client<a href="#simulation-client" class="hash-link" aria-label="Direct link to Simulation Client" title="Direct link to Simulation Client"></a></h2><p>A simulation client is a machine that creates and subscribes to topics with configurable message rates and sizes. |
| Because it is sometimes necessary to simulate a large load to use multiple client machines, the user does not interact |
| with the simulation client directly but instead delegates their requests to the simulation controller, which will then |
| send signals to clients to start incurring load. The client implementation is in the class |
| <code>org.apache.pulsar.testclient.LoadSimulationClient</code>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="usage">Usage<a href="#usage" class="hash-link" aria-label="Direct link to Usage" title="Direct link to Usage"></a></h3><p>To Start a simulation client, use the <code>pulsar-perf</code> script with the command <code>simulation-client</code> as follows:</p><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">pulsar-perf simulation-client --port </span><span class="token operator"><</span><span class="token plain">listen port</span><span class="token operator">></span><span class="token plain"> --service-url </span><span class="token operator"><</span><span class="token plain">pulsar </span><span class="token function" style="color:rgb(80, 250, 123)">service</span><span class="token plain"> url</span><span class="token operator">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The client will then be ready to receive controller commands.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="simulation-controller">Simulation Controller<a href="#simulation-controller" class="hash-link" aria-label="Direct link to Simulation Controller" title="Direct link to Simulation Controller"></a></h2><p>The simulation controller sends signals to the simulation clients, requesting them to create new topics, stop old |
| topics, change the load incurred by topics, as well as several other tasks. It is implemented in the class |
| <code>org.apache.pulsar.testclient.LoadSimulationController</code> and presents a shell to the user as an interface to send |
| command with.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="usage-1">Usage<a href="#usage-1" class="hash-link" aria-label="Direct link to Usage" title="Direct link to Usage"></a></h3><p>To start a simulation controller, use the <code>pulsar-perf</code> script with the command <code>simulation-controller</code> as follows:</p><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">pulsar-perf simulation-controller --cluster </span><span class="token operator"><</span><span class="token plain">cluster to simulate on</span><span class="token operator">></span><span class="token plain"> --client-port </span><span class="token operator"><</span><span class="token plain">listen port </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">for</span><span class="token plain"> clients</span><span class="token operator">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--clients </span><span class="token operator"><</span><span class="token plain">comma-separated list of client </span><span class="token function" style="color:rgb(80, 250, 123)">host</span><span class="token plain"> names</span><span class="token operator">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The clients should already be started before the controller is started. You will then be presented with a simple prompt, |
| where you can issue commands to simulation clients. Arguments often refer to tenant names, namespace names, and topic |
| names. In all cases, the BASE name of the tenants, namespaces, and topics are used. For example, for the topic |
| <code>persistent://my_tenant/my_cluster/my_namespace/my_topic</code>, the tenant name is <code>my_tenant</code>, the namespace name is |
| <code>my_namespace</code>, and the topic name is <code>my_topic</code>. The controller can perform the following actions:</p><ul><li>Create a topic with a producer and a consumer<ul><li><code>trade <tenant> <namespace> <topic> [--rate <message rate per second>] |
| [--rand-rate <lower bound>,<upper bound>] |
| [--size <message size in bytes>]</code></li></ul></li><li>Create a group of topics with a producer and a consumer<ul><li><code>trade_group <tenant> <group> <num_namespaces> [--rate <message rate per second>] |
| [--rand-rate <lower bound>,<upper bound>] |
| [--separation <separation between creating topics in ms>] [--size <message size in bytes>] |
| [--topics-per-namespace <number of topics to create per namespace>]</code></li></ul></li><li>Change the configuration of an existing topic<ul><li><code>change <tenant> <namespace> <topic> [--rate <message rate per second>] |
| [--rand-rate <lower bound>,<upper bound>] |
| [--size <message size in bytes>]</code></li></ul></li><li>Change the configuration of a group of topics<ul><li><code>change_group <tenant> <group> [--rate <message rate per second>] [--rand-rate <lower bound>,<upper bound>] |
| [--size <message size in bytes>] [--topics-per-namespace <number of topics to create per namespace>]</code></li></ul></li><li>Shutdown a previously created topic<ul><li><code>stop <tenant> <namespace> <topic></code></li></ul></li><li>Shutdown a previously created group of topics<ul><li><code>stop_group <tenant> <group></code></li></ul></li><li>Copy the historical data from one ZooKeeper to another and simulate based on the message rates and sizes in that history<ul><li><code>copy <tenant> <source zookeeper> <target zookeeper> [--rate-multiplier value]</code></li></ul></li><li>Simulate the load of the historical data on the current ZooKeeper (should be same ZooKeeper being simulated on)<ul><li><code>simulate <tenant> <zookeeper> [--rate-multiplier value]</code></li></ul></li><li>Stream the latest data from the given active ZooKeeper to simulate the real-time load of that ZooKeeper.<ul><li><code>stream <tenant> <zookeeper> [--rate-multiplier value]</code></li></ul></li></ul><p>The "group" arguments in these commands allow the user to create or affect multiple topics at once. Groups are created |
| when calling the <code>trade_group</code> command, and all topics from these groups may be subsequently modified or stopped |
| with the <code>change_group</code> and <code>stop_group</code> commands respectively. All ZooKeeper arguments are of the form |
| <code>zookeeper_host:port</code>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="difference-between-copy-simulate-and-stream">Difference Between Copy, Simulate, and Stream<a href="#difference-between-copy-simulate-and-stream" class="hash-link" aria-label="Direct link to Difference Between Copy, Simulate, and Stream" title="Direct link to Difference Between Copy, Simulate, and Stream"></a></h3><p>The commands <code>copy</code>, <code>simulate</code>, and <code>stream</code> are very similar but have significant differences. <code>copy</code> is used when |
| you want to simulate the load of a static, external ZooKeeper on the ZooKeeper you are simulating on. Thus, |
| <code>source zookeeper</code> should be the ZooKeeper you want to copy and <code>target zookeeper</code> should be the ZooKeeper you are |
| simulating on, and then it will get the full benefit of the historical data of the source in both load manager |
| implementations. <code>simulate</code> on the other hand takes in only one ZooKeeper, the one you are simulating on. It assumes |
| that you are simulating on a ZooKeeper that has historical data for <code>SimpleLoadManagerImpl</code> and creates equivalent |
| historical data for <code>ModularLoadManagerImpl</code>. Then, the load according to the historical data is simulated by the |
| clients. Finally, <code>stream</code> takes in an active ZooKeeper different than the ZooKeeper being simulated on and streams |
| load data from it and simulates the real-time load. In all cases, the optional <code>rate-multiplier</code> argument allows the |
| user to simulate some proportion of the load. For instance, using <code>--rate-multiplier 0.05</code> will cause messages to |
| be sent at only <code>5%</code> of the rate of the load that is being simulated.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="broker-monitor">Broker Monitor<a href="#broker-monitor" class="hash-link" aria-label="Direct link to Broker Monitor" title="Direct link to Broker Monitor"></a></h2><p>To observe the behavior of the load manager in these simulations, one may utilize the broker monitor, which is |
| implemented in <code>org.apache.pulsar.testclient.BrokerMonitor</code>. The broker monitor will print tabular load data to the |
| console as it is updated using watchers.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="usage-2">Usage<a href="#usage-2" class="hash-link" aria-label="Direct link to Usage" title="Direct link to Usage"></a></h3><p>To start a broker monitor, use the <code>monitor-brokers</code> command in the <code>pulsar-perf</code> script:</p><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">pulsar-perf monitor-brokers --connect-string </span><span class="token operator"><</span><span class="token plain">zookeeper host:port</span><span class="token operator">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The console will then continuously print load data until it is interrupted.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/apache/pulsar-site/edit/main/versioned_docs/version-3.2.x/develop-tools.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 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