<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Local (Single Node) · Apache Heron</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:version" content="0.20.4-incubating"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Local (Single Node) · Apache Heron"/><meta property="og:type" content="website"/><meta property="og:url" content="https://heron.apache.org/"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://heron.apache.org/img/undraw_online.svg"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://heron.apache.org/img/undraw_tweetstorm.svg"/><link rel="shortcut icon" href="/img/favicon-32x32.png"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><link rel="alternate" type="application/atom+xml" href="https://heron.apache.org/blog/atom.xml" title="Apache Heron Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://heron.apache.org/blog/feed.xml" title="Apache Heron Blog RSS Feed"/><script>
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<blockquote>
<p>The current version of Heron is 0.20.4-incubating
For other platforms, you need to build from source. Please refer to the <a href="compiling-overview">guide to compiling Heron</a>.</p>
</blockquote>
<h2><a class="anchor" aria-hidden="true" id="step-1-download-the-heron-tools"></a><a href="#step-1-download-the-heron-tools" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 1 --- Download the Heron tools</h2>
<p>Heron tools can be installed using <a href="#using-installation-scripts">installation scripts</a>.</p>
<blockquote>
<p>Note: As of version  0.20.4-incubating, there is a python compatibility on OSX.
The supported platforms are CentOS7, debian11, and Ubuntu18.04.</p>
</blockquote>
<h2><a class="anchor" aria-hidden="true" id="using-installation-scripts"></a><a href="#using-installation-scripts" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Using installation scripts</h2>
<p>To install Heron binaries directly, using installation scripts, go to Heron's <a href="https://heron.apache.org/download">download page</a>
and see a full listing of Heron releases for each available platform. The installation script for macOS (<code>debian11</code>), for example, is named
<code>heron-install-0.20.4-incubating-debian11.sh</code>.</p>
<p>Once you've downloaded the script, make it executable using <a href="https://en.wikipedia.org/wiki/Chmod">chmod</a>:</p>
<pre><code class="hljs css language-bash">$ chmod +x heron-*.sh
</code></pre>
<p>Now run the <a href="user-manuals-heron-cli">Heron client</a> installation script with the <code>--user</code> flag set. Here's an example:</p>
<blockquote>
<p>The script will install executables in the <code>~/bin</code> folder. You should add that folder to your <code>PATH</code> using <code>export PATH=~/bin:$PATH</code>.</p>
</blockquote>
<pre><code class="hljs css language-bash">$ ./heron-install-0.20.4-incubating-ubuntu.sh --user
Heron installer
---------------

Uncompressing...done
...
Heron is now installed!
</code></pre>
<p>To check that Heron is successfully installed, run <code>heron version</code>:</p>
<pre><code class="hljs css language-bash">$ heron version
heron.build.git.revision : b580f689d8cbcb3026966bde2aacf6da74d5bcf5
heron.build.git.status : Modified
heron.build.host : MBP
heron.build.time : Sun Mar 22 06:42:05 CDT 2020
heron.build.timestamp : 1584877325000
heron.build.user : ...
heron.build.version : update-docs-compiling
</code></pre>
<h2><a class="anchor" aria-hidden="true" id="step-2-launch-an-example-topology"></a><a href="#step-2-launch-an-example-topology" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 2 --- Launch an example topology</h2>
<blockquote>
<h4><a class="anchor" aria-hidden="true" id="note-for-macos-users"></a><a href="#note-for-macos-users" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Note for macOS users</h4>
</blockquote>
<blockquote>
<p>If you want to run topologies locally on macOS, you may need to add your
hostname to your <code>/etc/hosts</code> file under <code>localhost</code>. Here's an example line:
<code>127.0.0.1 localhost My-Mac-Laptop.local</code>. You can fetch your hostname by simply
running <code>hostname</code> in your shell.</p>
</blockquote>
<p>If you set the <code>--user</code> flag when running the installation scripts, some example
topologies will be installed in your <code>~/.heron/examples</code> directory. You can
launch an example <a href="heron-topology-concepts">topology</a> locally (on your machine)
using the <a href="user-manuals-heron-cli">Heron CLI tool</a>:</p>
<pre><code class="hljs css language-bash">$ heron submit <span class="hljs-built_in">local</span> \
  ~/.heron/examples/heron-streamlet-examples.jar \
  org.apache.heron.examples.streamlet.WindowedWordCountTopology \
  WindowedWordCountTopology \
  --deploy-deactivated
</code></pre>
<p>The output should look something like this:</p>
<pre><code class="hljs css language-bash">INFO: Launching topology <span class="hljs-string">'WindowedWordCountTopology'</span>

...

INFO: Topology <span class="hljs-string">'WindowedWordCountTopology'</span> launched successfully
INFO: Elapsed time: 3.409s.
</code></pre>
<p>This will <em>submit</em> the topology to your locally running Heron cluster but it
won't <em>activate</em> the topology because the <code>--deploy-deactivated</code> flag was set.
Activating the topology will be explored in <a href="#step-5-explore-topology-management-commands">step
5</a> below.</p>
<p>Note that the output shows whether the topology has been launched successfully as well
the working directory for the topology.</p>
<p>To check what's under the working directory, run:</p>
<pre><code class="hljs css language-bash">$ ls -al ~/.herondata/topologies/<span class="hljs-built_in">local</span>/<span class="hljs-variable">${ROLE}</span>/WindowedWordCountTopology
-rw-r--r--   1 username  staff     6141 Oct 12 09:58 WindowedWordCountTopology.defn
-rw-r--r--   1 username  staff        5 Oct 12 09:58 container_1_flatmap1_4.pid
-rw-r--r--   1 username  staff        5 Oct 12 09:58 container_1_logger1_3.pid
<span class="hljs-comment"># etc.</span>
</code></pre>
<p>All instances' log files can be found in <code>log-files</code> under the working directory:</p>
<pre><code class="hljs css language-bash">$ ls -al ~/.herondata/topologies/<span class="hljs-built_in">local</span>/<span class="hljs-variable">${ROLE}</span>/WindowedWordCountTopology/<span class="hljs-built_in">log</span>-files
total 408
-rw-r--r--   1 username  staff   5055 Oct 12 09:58 container_1_flatmap1_4.log.0
-rw-r--r--   1 username  staff      0 Oct 12 09:58 container_1_flatmap1_4.log.0.lck
-rw-r--r--   1 username  staff   5052 Oct 12 09:58 container_1_logger1_3.log.0
<span class="hljs-comment"># etc.</span>
</code></pre>
<h2><a class="anchor" aria-hidden="true" id="step-3-start-heron-tracker"></a><a href="#step-3-start-heron-tracker" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 3 --- Start Heron Tracker</h2>
<p>The <a href="user-manuals-heron-tracker-runbook">Heron Tracker</a> is a web service that
continuously gathers information about your Heron cluster. You can launch the
tracker by running the <code>heron-tracker</code> command (which is already installed):</p>
<pre><code class="hljs css language-bash">$ heron-tracker
... Running on port: 8888
... Using config file: <span class="hljs-variable">$HOME</span>/.herontools/conf/heron_tracker.yaml
</code></pre>
<p>You can reach Heron Tracker in your browser at <a href="http://localhost:8888">http://localhost:8888</a>
and see something like the following upon successful submission of the topology:
<img src="/docs/assets/heron-tracker.png" alt="Heron Tracker"></p>
<p>To explore Heron Tracker, please refer to <a href="user-manuals-tracker-rest">Heron Tracker Rest API</a></p>
<h2><a class="anchor" aria-hidden="true" id="step-4-start-heron-ui"></a><a href="#step-4-start-heron-ui" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 4 --- Start Heron UI</h2>
<p><a href="user-manuals-heron-ui-runbook">Heron UI</a> is a user interface that uses Heron Tracker to
provide detailed visual representations of your Heron topologies. To launch
Heron UI:</p>
<pre><code class="hljs css language-bash">$ heron-ui
... Running on port: 8889
... Using tracker url: http://localhost:8888
</code></pre>
<p>You can open Heron UI in your browser at <a href="http://localhost:8889">http://localhost:8889</a>
and see something like this upon successful submission of the topology:
<img src="/docs/assets/heron-ui.png" alt="Heron UI"></p>
<p>To play with Heron UI, please refer to <a href="guides-ui-guide">Heron UI Usage Guide</a></p>
<h2><a class="anchor" aria-hidden="true" id="step-5-explore-topology-management-commands"></a><a href="#step-5-explore-topology-management-commands" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 5 --- Explore topology management commands</h2>
<p>In step 2 you submitted a topology to your local cluster. The <code>heron</code> CLI tool
also enables you to activate, deactivate, and kill topologies and more.</p>
<pre><code class="hljs css language-bash">$ heron activate <span class="hljs-built_in">local</span> WindowedWordCountTopology
$ heron deactivate <span class="hljs-built_in">local</span> WindowedWordCountTopology
$ heron <span class="hljs-built_in">kill</span> <span class="hljs-built_in">local</span> WindowedWordCountTopology
</code></pre>
<p>Upon successful actions, a message similar to the following will appear:</p>
<pre><code class="hljs css language-bash">INFO: Successfully activated topology <span class="hljs-string">'WindowedWordCountTopology'</span>
INFO: Elapsed time: 1.980s.
</code></pre>
<p>For more info on these commands, read about <a href="heron-topology-concepts#topology-lifecycle">topology
lifecycles</a>.</p>
<p>To list the available CLI commands, run <code>heron</code> by itself:</p>
<pre><code class="hljs css language-bash">usage: heron &lt;<span class="hljs-built_in">command</span>&gt; &lt;options&gt; ...

Available commands:
    activate           Activate a topology
    deactivate         Deactivate a topology
    <span class="hljs-built_in">help</span>               Prints <span class="hljs-built_in">help</span> <span class="hljs-keyword">for</span> commands
    <span class="hljs-built_in">kill</span>               Kill a topology
    restart            Restart a topology
    submit             Submit a topology
    version            Print version of heron-cli

For detailed documentation, go to https://heron.apache.org
</code></pre>
<p>To invoke help output for a command, run <code>heron help COMMAND</code>. Here's an
example:</p>
<pre><code class="hljs css language-bash">$ heron <span class="hljs-built_in">help</span> submit
usage: heron submit [options] cluster/[role]/[environ] topology-file-name topology-class-name [topology-args]

Required arguments:
  cluster/[role]/[env]  Cluster, role, and environ to run topology
  topology-file-name    Topology jar/tar/zip file
  topology-class-name   Topology class name

Optional arguments:
  --config-path (a string; path to cluster config; default: <span class="hljs-string">"<span class="hljs-variable">$HOME</span>/.heron/conf"</span>)
  --config-property (key=value; a config key and its value; default: [])
  --deploy-deactivated (a boolean; default: <span class="hljs-string">"false"</span>)
  -D DEFINE             Define a system property to pass to java -D when
                        running main.
  --verbose (a boolean; default: <span class="hljs-string">"false"</span>)
</code></pre>
<h2><a class="anchor" aria-hidden="true" id="step-6-explore-other-example-topologies"></a><a href="#step-6-explore-other-example-topologies" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Step 6 --- Explore other example topologies</h2>
<p>The source code for the example topologies can be found
<a href="https://github.com/apache/incubator-heron/tree/master/examples/src/java/org/apache/heron/examples">on
GitHub</a>.
The included example topologies:</p>
<ul>
<li><code>AckingTopology.java</code> --- A topology with acking enabled.</li>
<li><code>ComponentJVMOptionsTopology.java</code> --- A topology that supplies JVM options
for each component.</li>
<li><code>CustomGroupingTopology.java</code> --- A topology that implements custom grouping.</li>
<li><code>ExclamationTopology.java</code> --- A spout that emits random words to a bolt that
then adds an exclamation mark.</li>
<li><code>MultiSpoutExclamationTopology.java</code> --- a topology with multiple spouts.</li>
<li><code>MultiStageAckingTopology.java</code> --- A three-stage topology. A spout emits to a
bolt that then feeds to another bolt.</li>
<li><code>TaskHookTopology.java</code> --- A topology that uses a task hook to subscribe to
event notifications.</li>
</ul>
<h2><a class="anchor" aria-hidden="true" id="troubleshooting"></a><a href="#troubleshooting" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Troubleshooting</h2>
<p>In case of any issues, please refer to <a href="getting-started-troubleshooting-guide">Quick Start Troubleshooting</a>.</p>
<h3><a class="anchor" aria-hidden="true" id="next-steps"></a><a href="#next-steps" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Next Steps</h3>
<ul>
<li><a href="getting-started-migrate-storm-topologies">Migrate Storm topologies</a> to Heron with simple <code>pom.xml</code>
changes</li>
<li><a href="deployment-overview">Deploy topologies</a> in clustered, scheduler-driven
environments (such as on <a href="schedulers-aurora-cluster">Aurora</a>
and <a href="schedulers-local">locally</a>)</li>
<li><a href="heron-architecture">Develop topologies</a> for Heron</li>
</ul>
</span></div></article></div><div class="docs-prevnext"><a class="docs-next button" href="/docs/0.20.4-incubating/getting-started-migrate-storm-topologies"><span>Migrate Storm Topologies</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#step-1-download-the-heron-tools">Step 1 --- Download the Heron tools</a></li><li><a href="#using-installation-scripts">Using installation scripts</a></li><li><a href="#step-2-launch-an-example-topology">Step 2 --- Launch an example topology</a></li><li><a href="#step-3-start-heron-tracker">Step 3 --- Start Heron Tracker</a></li><li><a href="#step-4-start-heron-ui">Step 4 --- Start Heron UI</a></li><li><a href="#step-5-explore-topology-management-commands">Step 5 --- Explore topology management commands</a></li><li><a href="#step-6-explore-other-example-topologies">Step 6 --- Explore other example topologies</a></li><li><a href="#troubleshooting">Troubleshooting</a><ul class="toc-headings"><li><a href="#next-steps">Next Steps</a></li></ul></li></ul></nav></div><footer class="nav-footer" id="footer"><div class="apache-disclaimer">Apache Heron is an effort undergoing incubation at <a target="_blank" href="https://apache.org/">The Apache Software Foundation (ASF)</a> sponsored by the Apache Incubator PMC. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.<br/><br/>Apache®, the names of Apache projects, and the feather logo are either <a rel="external" href="https://www.apache.org/foundation/marks/list/">registered trademarks or trademarks</a> of the Apache Software Foundation in the United States and/or other countries.<br/><br/><div class="copyright-box">Copyright © 2023 the Apache Software Foundation, Apache Heron, Heron, 
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