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Heron clusters can be configured at two levels:
<ol>
<li><strong>The system level</strong> --- System-level configurations apply to the whole
Heron cluster rather than to any specific component (e.g. logging configurations).</li>
<li><strong>The component level</strong> --- Component-level configurations enable you to establish
default configurations for different components.
These configurations are fixed at any stage of the topology's
<a href="heron-topology-concepts#topology-lifecycle">lifecycle</a>, once the topology
is deployed.</li>
</ol>
<p>Neither system- nor component-level configurations can be overridden by topology developers.</p>
<p>All system-level configs and component-level defaults are declared in a
<a href="http://www.yaml.org/">YAML</a> config file in <code>heron/config/src/yaml/conf/{cluster}/heron_internals.yaml</code>
in the Heron codebase. You can leave that file as is when <a href="compiling-overview">compiling
Heron</a> or modify the values to suit your use
case.</p>
<h2><a class="anchor" aria-hidden="true" id="the-system-level"></a><a href="#the-system-level" 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>The System Level</h2>
<p>There are a small handful of system-level configs for Heron. These are detailed
in <a href="cluster-config-system-level">System-level Configuration</a>.</p>
<h2><a class="anchor" aria-hidden="true" id="the-component-level"></a><a href="#the-component-level" 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>The Component Level</h2>
<p>There is a wide variety of component-level configurations that you can establish
as defaults in your Heron cluster. These configurations tend to apply to
specific components in a topology and are detailed in the docs below:</p>
<ul>
<li><a href="cluster-config-instance">Heron Instance</a></li>
<li><a href="cluster-config-metrics">Heron Metrics Manager</a></li>
<li><a href="cluster-config-stream">Heron Stream Manager</a></li>
<li><a href="cluster-config-tmanager">Heron Topology Manager</a></li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="overriding-heron-cluster-configuration"></a><a href="#overriding-heron-cluster-configuration" 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>Overriding Heron Cluster Configuration</h3>
<p>The Heron configuration applies globally to a cluster.
It is discouraged to modify the configuration to suit one topology.
It is not possible to override the Heron configuration
for a topology via Heron client or other Heron tools.</p>
<p>More on Heron's CLI tool can be found in <a href="user-manuals-heron-cli">Managing Heron
Topologies</a>.</p>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/next/schedulers-yarn"><span class="arrow-prev">← </span><span>YARN Cluster</span></a><a class="docs-next button" href="/docs/next/cluster-config-system-level"><span>System Level Configuration</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#the-system-level">The System Level</a></li><li><a href="#the-component-level">The Component Level</a><ul class="toc-headings"><li><a href="#overriding-heron-cluster-configuration">Overriding Heron Cluster Configuration</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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