<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>System Level Configuration · 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="0.20.0-incubating"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="System Level Configuration · 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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<p>The parameters in the sections below are set at the system level and thus do not
apply to any specific component.</p>
<h2><a class="anchor" aria-hidden="true" id="general"></a><a href="#general" 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>General</h2>
<table>
<thead>
<tr><th style="text-align:left">Config</th><th style="text-align:left">Meaning</th><th style="text-align:left">Default</th></tr>
</thead>
<tbody>
<tr><td style="text-align:left"><code>heron.check.tmanager.location.interval.sec</code></td><td style="text-align:left">The interval, in seconds, after which to check if the topology manager location has been fetched or not</td><td style="text-align:left">120</td></tr>
<tr><td style="text-align:left"><code>heron.metrics.export.interval</code></td><td style="text-align:left">The interval, in seconds, at which components export metrics to the topology's Metrics Manager</td></tr>
</tbody>
</table>
<h2><a class="anchor" aria-hidden="true" id="logging"></a><a href="#logging" 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>Logging</h2>
<table>
<thead>
<tr><th style="text-align:left">Config</th><th style="text-align:left">Meaning</th><th style="text-align:left">Default</th></tr>
</thead>
<tbody>
<tr><td style="text-align:left"><code>heron.logging.directory</code></td><td style="text-align:left">The relative path to the logging directory</td><td style="text-align:left"><code>log-files</code></td></tr>
<tr><td style="text-align:left"><code>heron.logging.maximum.size.mb</code></td><td style="text-align:left">The maximum log file size (in megabytes)</td><td style="text-align:left">100</td></tr>
<tr><td style="text-align:left"><code>heron.logging.maximum.files</code></td><td style="text-align:left">The maximum number of log files</td><td style="text-align:left">5</td></tr>
<tr><td style="text-align:left"><code>heron.logging.prune.interval.sec</code></td><td style="text-align:left">The time interval, in seconds, at which Heron prunes log files</td><td style="text-align:left">300</td></tr>
<tr><td style="text-align:left"><code>heron.logging.flush.interval.sec</code></td><td style="text-align:left">The time interval, in seconds, at which Heron flushes log files</td><td style="text-align:left">10</td></tr>
<tr><td style="text-align:left"><code>heron.logging.err.threshold</code></td><td style="text-align:left">The threshold level to log error</td><td style="text-align:left">3</td></tr>
</tbody>
</table>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.0-incubating/cluster-config-overview"><span class="arrow-prev">← </span><span>Cluster Config Overview</span></a><a class="docs-next button" href="/docs/0.20.0-incubating/cluster-config-instance"><span>Heron Instance</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#general">General</a></li><li><a href="#logging">Logging</a></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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