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<p><a href="https://www.aliyun.com">Alibaba Cloud</a> is the 3rd largest cloud infrastructure provider in the world. It provides its own storage solution known as OSS, <a href="https://www.aliyun.com/product/oss">Object Storage Service</a>.
This document describes how to use OSS as Druid deep storage.</p>
<h2><a class="anchor" aria-hidden="true" id="installation"></a><a href="#installation" 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>Installation</h2>
<p>Use the <a href="/docs/latest/operations/pull-deps.html">pull-deps</a> tool shipped with Druid to install the <code>aliyun-oss-extensions</code> extension, as described <a href="/docs/latest/development/extensions.html#community-extensions">here</a> on middle manager and historical nodes.</p>
<pre><code class="hljs css language-bash">java -classpath <span class="hljs-string">"{YOUR_DRUID_DIR}/lib/*"</span> org.apache.druid.cli.Main tools pull-deps -c org.apache.druid.extensions.contrib:aliyun-oss-extensions:{YOUR_DRUID_VERSION}
</code></pre>
<h2><a class="anchor" aria-hidden="true" id="enabling"></a><a href="#enabling" 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>Enabling</h2>
<p>After installation, add this <code>aliyun-oss-extensions</code> extension to <code>druid.extensions.loadList</code> in common.runtime.properties and then restart middle manager and historical nodes.</p>
<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#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>Configuration</h2>
<p>First add the following OSS configurations to common.runtime.properties</p>
<table>
<thead>
<tr><th>Property</th><th>Description</th><th>Required</th></tr>
</thead>
<tbody>
<tr><td><code>druid.oss.accessKey</code></td><td>The <code>AccessKey ID</code> of the account to be used to access the OSS bucket</td><td>yes</td></tr>
<tr><td><code>druid.oss.secretKey</code></td><td>The <code>AccessKey Secret</code> of the account to be used to access the OSS bucket</td><td>yes</td></tr>
<tr><td><code>druid.oss.endpoint</code></td><td>The endpoint URL of your OSS storage. <br/>If your Druid cluster is also hosted in the same region on Alibaba Cloud as the region of your OSS bucket, it's recommended to use the internal network endpoint url, so that any inbound and outbound traffic to the OSS bucket is free of charge.</td><td>yes</td></tr>
</tbody>
</table>
<p>To use OSS as deep storage, add the following configurations:</p>
<table>
<thead>
<tr><th>Property</th><th>Description</th><th>Required</th></tr>
</thead>
<tbody>
<tr><td><code>druid.storage.type</code></td><td>Global deep storage provider. Must be set to <code>oss</code> to make use of this extension.</td><td>yes</td></tr>
<tr><td><code>druid.storage.oss.bucket</code></td><td>Storage bucket name.</td><td>yes</td></tr>
<tr><td><code>druid.storage.oss.prefix</code></td><td>Folder where segments will be published to. <code>druid/segments</code> is recommended.</td><td>No</td></tr>
</tbody>
</table>
<p>If OSS is used as deep storage for segment files, it's also recommended saving index logs in the OSS too.
To do this, add following configurations:</p>
<table>
<thead>
<tr><th>Property</th><th>Description</th><th>Required</th></tr>
</thead>
<tbody>
<tr><td><code>druid.indexer.logs.type</code></td><td>Global deep storage provider. Must be set to <code>oss</code> to make use of this extension.</td><td>yes</td></tr>
<tr><td><code>druid.indexer.logs.oss.bucket</code></td><td>The bucket used to keep logs. It could be the same as <code>druid.storage.oss.bucket</code></td><td>yes</td></tr>
<tr><td><code>druid.indexer.logs.oss.prefix</code></td><td>Folder where log files will be published to. <code>druid/logs</code> is recommended.</td><td>no</td></tr>
</tbody>
</table>
<h2><a class="anchor" aria-hidden="true" id="reading-data-from-oss"></a><a href="#reading-data-from-oss" 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>Reading data from OSS</h2>
<p>Currently, Web Console does not support ingestion from OSS, but it could be done by submitting an ingestion task with OSS's input source configuration.</p>
<p>Below shows the configurations of OSS's input source.</p>
<h3><a class="anchor" aria-hidden="true" id="oss-input-source"></a><a href="#oss-input-source" 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>OSS Input Source</h3>
<table>
<thead>
<tr><th>property</th><th>description</th><th>Required</th></tr>
</thead>
<tbody>
<tr><td>type</td><td>This should be <code>oss</code>.</td><td>yes</td></tr>
<tr><td>uris</td><td>JSON array of URIs where OSS objects to be ingested are located.<br/>For example, <code>oss://{your_bucket}/{source_file_path}</code></td><td><code>uris</code> or <code>prefixes</code> or <code>objects</code> must be set</td></tr>
<tr><td>prefixes</td><td>JSON array of URI prefixes for the locations of OSS objects to be ingested. Empty objects starting with one of the given prefixes will be skipped.</td><td><code>uris</code> or <code>prefixes</code> or <code>objects</code> must be set</td></tr>
<tr><td>objects</td><td>JSON array of <a href="#oss-object">OSS Objects</a> to be ingested.</td><td><code>uris</code> or <code>prefixes</code> or <code>objects</code> must be set</td></tr>
<tr><td>properties</td><td><a href="#properties-object">Properties Object</a> for overriding the default OSS configuration. See below for more information.</td><td>no (defaults will be used if not given)</td></tr>
</tbody>
</table>
<h4><a class="anchor" aria-hidden="true" id="oss-object"></a><a href="#oss-object" 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>OSS Object</h4>
<table>
<thead>
<tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr>
</thead>
<tbody>
<tr><td>bucket</td><td>Name of the OSS bucket</td><td>None</td><td>yes</td></tr>
<tr><td>path</td><td>The path where data is located.</td><td>None</td><td>yes</td></tr>
</tbody>
</table>
<h4><a class="anchor" aria-hidden="true" id="properties-object"></a><a href="#properties-object" 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>Properties Object</h4>
<table>
<thead>
<tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr>
</thead>
<tbody>
<tr><td>accessKey</td><td>The <a href="/docs/latest/operations/password-provider.html">Password Provider</a> or plain text string of this OSS InputSource's access key</td><td>None</td><td>yes</td></tr>
<tr><td>secretKey</td><td>The <a href="/docs/latest/operations/password-provider.html">Password Provider</a> or plain text string of this OSS InputSource's secret key</td><td>None</td><td>yes</td></tr>
<tr><td>endpoint</td><td>The endpoint of this OSS InputSource</td><td>None</td><td>no</td></tr>
</tbody>
</table>
<h3><a class="anchor" aria-hidden="true" id="reading-from-a-file"></a><a href="#reading-from-a-file" 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>Reading from a file</h3>
<p>Say that the file <code>rollup-data.json</code>, which can be found under Druid's <code>quickstart/tutorial</code> directory, has been uploaded to a folder <code>druid</code> in your OSS bucket, the bucket for which your Druid is configured.
In this case, the <code>uris</code> property of the OSS's input source can be used for reading, as shown:</p>
<pre><code class="hljs css language-json">{
  <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
  <span class="hljs-attr">"spec"</span> : {
    <span class="hljs-attr">"dataSchema"</span> : {
      <span class="hljs-attr">"dataSource"</span> : <span class="hljs-string">"rollup-tutorial-from-oss"</span>,
      <span class="hljs-attr">"timestampSpec"</span>: {
        <span class="hljs-attr">"column"</span>: <span class="hljs-string">"timestamp"</span>,
        <span class="hljs-attr">"format"</span>: <span class="hljs-string">"iso"</span>
      },
      <span class="hljs-attr">"dimensionsSpec"</span> : {
        <span class="hljs-attr">"dimensions"</span> : [
          <span class="hljs-string">"srcIP"</span>,
          <span class="hljs-string">"dstIP"</span>
        ]
      },
      <span class="hljs-attr">"metricsSpec"</span> : [
        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"count"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"count"</span> },
        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"packets"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"packets"</span> },
        { <span class="hljs-attr">"type"</span> : <span class="hljs-string">"longSum"</span>, <span class="hljs-attr">"name"</span> : <span class="hljs-string">"bytes"</span>, <span class="hljs-attr">"fieldName"</span> : <span class="hljs-string">"bytes"</span> }
      ],
      <span class="hljs-attr">"granularitySpec"</span> : {
        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"uniform"</span>,
        <span class="hljs-attr">"segmentGranularity"</span> : <span class="hljs-string">"week"</span>,
        <span class="hljs-attr">"queryGranularity"</span> : <span class="hljs-string">"minute"</span>,
        <span class="hljs-attr">"intervals"</span> : [<span class="hljs-string">"2018-01-01/2018-01-03"</span>],
        <span class="hljs-attr">"rollup"</span> : <span class="hljs-literal">true</span>
      }
    },
    <span class="hljs-attr">"ioConfig"</span> : {
      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
      <span class="hljs-attr">"inputSource"</span> : {
        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"oss"</span>,
        <span class="hljs-attr">"uris"</span> : [
          <span class="hljs-string">"oss://{YOUR_BUCKET_NAME}/druid/rollup-data.json"</span>
        ]
      },
      <span class="hljs-attr">"inputFormat"</span> : {
        <span class="hljs-attr">"type"</span> : <span class="hljs-string">"json"</span>
      },
      <span class="hljs-attr">"appendToExisting"</span> : <span class="hljs-literal">false</span>
    },
    <span class="hljs-attr">"tuningConfig"</span> : {
      <span class="hljs-attr">"type"</span> : <span class="hljs-string">"index_parallel"</span>,
      <span class="hljs-attr">"maxRowsPerSegment"</span> : <span class="hljs-number">5000000</span>,
      <span class="hljs-attr">"maxRowsInMemory"</span> : <span class="hljs-number">25000</span>
    }
  }
}
</code></pre>
<p>By posting the above ingestion task spec to <code>http://{YOUR_ROUTER_IP}:8888/druid/indexer/v1/task</code>, an ingestion task will be created by the indexing service to ingest.</p>
<h3><a class="anchor" aria-hidden="true" id="reading-files-in-folders"></a><a href="#reading-files-in-folders" 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>Reading files in folders</h3>
<p>If we want to read files in a same folder, we could use the <code>prefixes</code> property to specify the folder name where Druid could find input files instead of specifying file URIs one by one.</p>
<pre><code class="hljs css language-json">...
    "ioConfig" : {
      "type" : "index_parallel",
      "inputSource" : {
        "type" : "oss",
        "prefixes" : [
          "oss://{YOUR_BUCKET_NAME}/2020", "oss://{YOUR_BUCKET_NAME}/2021"
        ]
      },
      "inputFormat" : {
        "type" : "json"
      },
      "appendToExisting" : false
    }
...
</code></pre>
<p>The spec above tells the ingestion task to read all files under <code>2020</code> and <code>2021</code> folders.</p>
<h3><a class="anchor" aria-hidden="true" id="reading-from-other-buckets"></a><a href="#reading-from-other-buckets" 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>Reading from other buckets</h3>
<p>If you want to read from files in buckets which are different from the bucket Druid is configured, use <code>objects</code> property of OSS's InputSource for task submission as below:</p>
<pre><code class="hljs css language-json">...
    "ioConfig" : {
      "type" : "index_parallel",
      "inputSource" : {
        "type" : "oss",
        "objects" : [
          {"bucket": "YOUR_BUCKET_NAME", "path": "druid/rollup-data.json"}
        ]
      },
      "inputFormat" : {
        "type" : "json"
      },
      "appendToExisting" : false
    }
...
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="reading-with-customized-accesskey"></a><a href="#reading-with-customized-accesskey" 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>Reading with customized accessKey</h3>
<p>If the default <code>druid.oss.accessKey</code> is not able to access a bucket, <code>properties</code> could be used to customize these secret information as below:</p>
<pre><code class="hljs css language-json">...
    "ioConfig" : {
      "type" : "index_parallel",
      "inputSource" : {
        "type" : "oss",
        "objects" : [
          {"bucket": "YOUR_BUCKET_NAME", "path": "druid/rollup-data.json"}
        ],
        "properties": {
          "endpoint": "YOUR_ENDPOINT_OF_BUCKET",
          "accessKey": "YOUR_ACCESS_KEY",
          "secretKey": "YOUR_SECRET_KEY"
        }
      },
      "inputFormat" : {
        "type" : "json"
      },
      "appendToExisting" : false
    }
...
</code></pre>
<p>This <code>properties</code> could be applied to any of <code>uris</code>, <code>objects</code>, <code>prefixes</code> property above.</p>
<h2><a class="anchor" aria-hidden="true" id="troubleshooting"></a><a href="#troubleshooting" 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>Troubleshooting</h2>
<p>When using OSS as deep storage or reading from OSS, the most problems that users will encounter are related to OSS permission.
Please refer to the official <a href="https://www.alibabacloud.com/help/doc-detail/42777.htm">OSS permission troubleshooting document</a> to find a solution.</p>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/gce-extensions.html"><span class="arrow-prev">← </span><span>GCE Extensions</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/prometheus.html"><span>Prometheus Emitter</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#installation">Installation</a></li><li><a href="#enabling">Enabling</a></li><li><a href="#configuration">Configuration</a></li><li><a href="#reading-data-from-oss">Reading data from OSS</a><ul class="toc-headings"><li><a href="#oss-input-source">OSS Input Source</a></li><li><a href="#reading-from-a-file">Reading from a file</a></li><li><a href="#reading-files-in-folders">Reading files in folders</a></li><li><a href="#reading-from-other-buckets">Reading from other buckets</a></li><li><a href="#reading-with-customized-accesskey">Reading with customized accessKey</a></li></ul></li><li><a href="#troubleshooting">Troubleshooting</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2022 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.js"></script><script>
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