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<p>If you are running in Amazon AWS, Heron provides out of the box uploader for S3,
the object storage. S3 uploader is useful when the topologies run in a distributed
cluster of Amazon EC2 compute instances. Since S3 replicates the data, it provides
a scalable mechanism for distributing the user topology jars.</p>
<h3><a class="anchor" aria-hidden="true" id="s3-uploader-configuration"></a><a href="#s3-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>S3 Uploader Configuration</h3>
<p>You can make Heron use S3 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.s3.S3Uploader</code></p></li>
<li><p><code>heron.uploader.s3.bucket</code> --- Specifies the S3 bucket where the topology jar should be
uploaded.</p></li>
<li><p><code>heron.uploader.s3.access_key</code> --- Specify the access key of the AWS account that has
write access to the bucket</p></li>
<li><p><code>heron.uploader.s3.secret_key</code> --- Specify the secret access of the AWS account that has
write access to the bucket</p></li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="example-s3-uploader-configuration"></a><a href="#example-s3-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 S3 Uploader Configuration</h3>
<p>Below is an example configuration (in <code>uploader.yaml</code>) for a S3 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.s3.S3Uploader</span>

<span class="hljs-comment"># S3 region bucket is created.  Must specify.</span>
<span class="hljs-attr">heron.uploader.s3.region:</span> <span class="hljs-string">us-east-1</span>

<span class="hljs-comment"># S3 bucket to put the jar file into</span>
<span class="hljs-attr">heron.uploader.s3.bucket:</span> <span class="hljs-string">heron-topologies-company-com</span>

<span class="hljs-comment"># AWS access key</span>
<span class="hljs-attr">heron.uploader.s3.access_key:</span> <span class="hljs-string">access_key</span>

<span class="hljs-comment"># AWS secret access key</span>
<span class="hljs-attr">heron.uploader.s3.secret_key:</span> <span class="hljs-string">secret_access_key</span>
</code></pre>
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