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<p>When a topology is submitted 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 each
container. Heron can use a Http uploader to upload topology jar distribution to a stable
Http location.</p>
<h3><a class="anchor" aria-hidden="true" id="http-uploader-configuration"></a><a href="#http-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>Http Uploader Configuration</h3>
<p>You can make Heron aware of the Http 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.http.HttpUploader</code></p></li>
<li><p><code>heron.uploader.http.uri</code> — Provides the name of the URI where the topology jar should be
uploaded.</p></li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="example-http-uploader-configuration"></a><a href="#example-http-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 Http Uploader Configuration</h3>
<p>Below is an example configuration (in <code>uploader.yaml</code>) for a Http 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.http.HttpUploader</span>

<span class="hljs-attr">heron.uploader.http.uri:</span> <span class="hljs-string">http://localhost:9000/api/v1/file/upload</span>
</code></pre>
<p>Also Heron's API server can be used as a file server for the HttpUploader to upload topology
package/jars as follows:</p>
<pre><code class="hljs">${HOME}/.heron/bin/heron-apiserver 
--cluster nomad
--base-template nomad
-D heron<span class="hljs-selector-class">.statemgr</span><span class="hljs-selector-class">.connection</span>.string=&lt;zookeeper_host:zookeeper_port&gt; 
-D heron<span class="hljs-selector-class">.nomad</span><span class="hljs-selector-class">.scheduler</span>.uri=&lt;scheduler_uri&gt; 
-D heron<span class="hljs-selector-class">.class</span>.uploader=org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.heron</span><span class="hljs-selector-class">.uploader</span><span class="hljs-selector-class">.http</span><span class="hljs-selector-class">.HttpUploader</span>
--verbose
</code></pre>
<p>Also Http Server that topology package/jars are uploaded needs to return an URI upon upload
so that Heron will know the location to download in the future.</p>
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