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<p>When you submit a topology to Heron, the topology jars will be uploaded to a
stable location. The submitter will provide this location to the scheduler and
it will pass it to the executor each container. Heron can use a local file
system as a stable storage for topology jar distribution.</p>
<p>There are a few things you should be aware of local file system uploader:</p>
<ul>
<li><p>Local file system uploader is mainly used in conjunction with local scheduler.</p></li>
<li><p>It is ideal, if you want to run Heron in a single server, laptop or an edge device.</p></li>
<li><p>Useful for Heron developers for local testing of the components.</p></li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="local-file-system-uploader-configuration"></a><a href="#local-file-system-uploader-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>Local File System Uploader Configuration</h3>
<p>You can make Heron aware of the local file system uploader by modifying the
<code>uploader.yaml</code> config file specific for the Heron cluster. You'll need to specify
the following for each cluster:</p>
<ul>
<li><p><code>heron.class.uploader</code> --- Indicate the uploader class to be loaded. You should set this
to <code>org.apache.heron.uploader.localfs.LocalFileSystemUploader</code></p></li>
<li><p><code>heron.uploader.localfs.file.system.directory</code> --- Provides the name of the directory where
the topology jar should be uploaded. The name of the directory should be unique per cluster
You could use the Heron environment variables <code>${CLUSTER}</code> that will be substituted by cluster
name. If this is not set, <code>${HOME}/.herondata/repository/${CLUSTER}/${ROLE}/${TOPOLOGY}</code> will be set as default.</p></li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="example-local-file-system-uploader-configuration"></a><a href="#example-local-file-system-uploader-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>Example Local File System Uploader Configuration</h3>
<p>Below is an example configuration (in <code>uploader.yaml</code>) for a local file system uploader:</p>
<pre><code class="hljs css language-yaml"><span class="hljs-comment"># uploader class for transferring the topology jar/tar files to storage</span>
<span class="hljs-attr">heron.class.uploader:</span> <span class="hljs-string">org.apache.heron.uploader.localfs.LocalFileSystemUploader</span>

<span class="hljs-comment"># name of the directory to upload topologies for local file system uploader</span>
<span class="hljs-attr">heron.uploader.localfs.file.system.directory:</span> <span class="hljs-string">${HOME}/.herondata/topologies/${CLUSTER}</span>
</code></pre>
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