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<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-azure-extensions</code> extension.</p>
<h2><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" 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>Deep Storage</h2>
<p><a href="http://azure.microsoft.com/en-us/services/storage/">Microsoft Azure Storage</a> is another option for deep storage. This requires some additional Druid configuration.</p>
<table>
<thead>
<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
</thead>
<tbody>
<tr><td><code>druid.storage.type</code></td><td>azure</td><td></td><td>Must be set.</td></tr>
<tr><td><code>druid.azure.account</code></td><td></td><td>Azure Storage account name.</td><td>Must be set.</td></tr>
<tr><td><code>druid.azure.key</code></td><td></td><td>Azure Storage account key.</td><td>Must be set.</td></tr>
<tr><td><code>druid.azure.container</code></td><td></td><td>Azure Storage container name.</td><td>Must be set.</td></tr>
<tr><td><code>druid.azure.protocol</code></td><td>http or https</td><td></td><td>https</td></tr>
<tr><td><code>druid.azure.maxTries</code></td><td></td><td>Number of tries before cancel an Azure operation.</td><td>3</td></tr>
</tbody>
</table>
<p>See <a href="http://azure.microsoft.com/en-us/pricing/free-trial/">Azure Services</a> for more information.</p>
<h2><a class="anchor" aria-hidden="true" id="firehose"></a><a href="#firehose" 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>Firehose</h2>
<p><a name="firehose"></a></p>
<h4><a class="anchor" aria-hidden="true" id="staticazureblobstorefirehose"></a><a href="#staticazureblobstorefirehose" 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>StaticAzureBlobStoreFirehose</h4>
<p>This firehose ingests events, similar to the StaticS3Firehose, but from an Azure Blob Store.</p>
<p>Data is newline delimited, with one JSON object per line and parsed as per the <code>InputRowParser</code> configuration.</p>
<p>The storage account is shared with the one used for Azure deep storage functionality, but blobs can be in a different container.</p>
<p>As with the S3 blobstore, it is assumed to be gzipped if the extension ends in .gz</p>
<p>This firehose is <em>splittable</em> and can be used by <a href="/docs/latest/ingestion/native-batch.html#parallel-task">native parallel index tasks</a>.
Since each split represents an object in this firehose, each worker task of <code>index_parallel</code> will read an object.</p>
<p>Sample spec:</p>
<pre><code class="hljs css language-json">"firehose" : {
    "type" : "static-azure-blobstore",
    "blobs": [
        {
          "container": "container",
          "path": "/path/to/your/file.json"
        },
        {
          "container": "anothercontainer",
          "path": "/another/path.json"
        }
    ]
}
</code></pre>
<p>This firehose provides caching and prefetching features. In IndexTask, a firehose can be read twice if intervals or
shardSpecs are not specified, and, in this case, caching can be useful. Prefetching is preferred when direct scan of objects is slow.</p>
<table>
<thead>
<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
</thead>
<tbody>
<tr><td>type</td><td>This should be <code>static-azure-blobstore</code>.</td><td>N/A</td><td>yes</td></tr>
<tr><td>blobs</td><td>JSON array of <a href="https://msdn.microsoft.com/en-us/library/azure/ee691964.aspx">Azure blobs</a>.</td><td>N/A</td><td>yes</td></tr>
<tr><td>maxCacheCapacityBytes</td><td>Maximum size of the cache space in bytes. 0 means disabling cache. Cached files are not removed until the ingestion task completes.</td><td>1073741824</td><td>no</td></tr>
<tr><td>maxFetchCapacityBytes</td><td>Maximum size of the fetch space in bytes. 0 means disabling prefetch. Prefetched files are removed immediately once they are read.</td><td>1073741824</td><td>no</td></tr>
<tr><td>prefetchTriggerBytes</td><td>Threshold to trigger prefetching Azure objects.</td><td>maxFetchCapacityBytes / 2</td><td>no</td></tr>
<tr><td>fetchTimeout</td><td>Timeout for fetching an Azure object.</td><td>60000</td><td>no</td></tr>
<tr><td>maxFetchRetry</td><td>Maximum retry for fetching an Azure object.</td><td>3</td><td>no</td></tr>
</tbody>
</table>
<p>Azure Blobs:</p>
<table>
<thead>
<tr><th>property</th><th>description</th><th>default</th><th>required?</th></tr>
</thead>
<tbody>
<tr><td>container</td><td>Name of the azure <a href="https://azure.microsoft.com/en-us/documentation/articles/storage-dotnet-how-to-use-blobs/#create-a-container">container</a></td><td>N/A</td><td>yes</td></tr>
<tr><td>path</td><td>The path where data is located.</td><td>N/A</td><td>yes</td></tr>
</tbody>
</table>
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