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<h2><a class="anchor" aria-hidden="true" id="hadoop-setup"></a><a href="#hadoop-setup" 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>Hadoop Setup</h2>
<p>Following are the configurations files required to be copied over to Druid conf folders:</p>
<ol>
<li>For HDFS as a deep storage, hdfs-site.xml, core-site.xml</li>
<li>For ingestion, mapred-site.xml, yarn-site.xml</li>
</ol>
<h3><a class="anchor" aria-hidden="true" id="hdfs-folders-and-permissions"></a><a href="#hdfs-folders-and-permissions" 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>HDFS Folders and permissions</h3>
<ol>
<li><p>Choose any folder name for the druid deep storage, for example 'druid'</p></li>
<li><p>Create the folder in hdfs under the required parent folder. For example,
<code>hdfs dfs -mkdir /druid</code>
OR
<code>hdfs dfs -mkdir /apps/druid</code></p></li>
<li><p>Give druid processes appropriate permissions for the druid processes to access this folder. This would ensure that druid is able to create necessary folders like data and indexing_log in HDFS.
For example, if druid processes run as user 'root', then</p>
<p><code>hdfs dfs -chown root:root /apps/druid</code></p>
<p>OR</p>
<p><code>hdfs dfs -chmod 777 /apps/druid</code></p></li>
</ol>
<p>Druid creates necessary sub-folders to store data and index under this newly created folder.</p>
<h2><a class="anchor" aria-hidden="true" id="druid-setup"></a><a href="#druid-setup" 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>Druid Setup</h2>
<p>Edit common.runtime.properties at conf/druid/_common/common.runtime.properties to include the HDFS properties. Folders used for the location are same as the ones used for example above.</p>
<h3><a class="anchor" aria-hidden="true" id="commonruntimeproperties"></a><a href="#commonruntimeproperties" 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>common.runtime.properties</h3>
<pre><code class="hljs css language-properties"><span class="hljs-comment"># Deep storage</span>
<span class="hljs-comment">#</span>
<span class="hljs-comment"># For HDFS:</span>
<span class="hljs-meta">druid.storage.type</span>=<span class="hljs-string">hdfs</span>
<span class="hljs-meta">druid.storage.storageDirectory</span>=<span class="hljs-string">/druid/segments</span>
<span class="hljs-comment"># OR</span>
<span class="hljs-comment"># druid.storage.storageDirectory=/apps/druid/segments</span>
<span class="hljs-comment">
#</span>
<span class="hljs-comment"># Indexing service logs</span>
<span class="hljs-comment">#</span>
<span class="hljs-comment">
# For HDFS:</span>
<span class="hljs-meta">druid.indexer.logs.type</span>=<span class="hljs-string">hdfs</span>
<span class="hljs-meta">druid.indexer.logs.directory</span>=<span class="hljs-string">/druid/indexing-logs</span>
<span class="hljs-comment"># OR</span>
<span class="hljs-comment"># druid.storage.storageDirectory=/apps/druid/indexing-logs</span>
</code></pre>
<p>Note: Comment out Local storage and S3 Storage parameters in the file</p>
<p>Also include hdfs-storage core extension to <code>conf/druid/_common/common.runtime.properties</code></p>
<pre><code class="hljs css language-properties"><span class="hljs-comment">#</span>
<span class="hljs-comment"># Extensions</span>
<span class="hljs-comment">#</span>

<span class="hljs-meta">druid.extensions.directory</span>=<span class="hljs-string">dist/druid/extensions</span>
<span class="hljs-meta">druid.extensions.hadoopDependenciesDir</span>=<span class="hljs-string">dist/druid/hadoop-dependencies</span>
<span class="hljs-meta">druid.extensions.loadList</span>=<span class="hljs-string">["mysql-metadata-storage", "druid-hdfs-storage", "druid-kerberos"]</span>
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="hadoop-jars"></a><a href="#hadoop-jars" 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>Hadoop Jars</h3>
<p>Ensure that Druid has necessary jars to support the Hadoop version.</p>
<p>Find the hadoop version using command, <code>hadoop version</code></p>
<p>In case there is other software used with hadoop, like <code>WanDisco</code>, ensure that</p>
<ol>
<li>the necessary libraries are available</li>
<li>add the requisite extensions to <code>druid.extensions.loadlist</code> in <code>conf/druid/_common/common.runtime.properties</code></li>
</ol>
<h3><a class="anchor" aria-hidden="true" id="kerberos-setup"></a><a href="#kerberos-setup" 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>Kerberos setup</h3>
<p>Create a headless keytab which would have access to the druid data and index.</p>
<p>Edit conf/druid/_common/common.runtime.properties and add the following properties:</p>
<pre><code class="hljs css language-properties"><span class="hljs-attr">druid.hadoop.security.kerberos.principal</span>
<span class="hljs-attr">druid.hadoop.security.kerberos.keytab</span>
</code></pre>
<p>For example</p>
<pre><code class="hljs css language-properties"><span class="hljs-meta">druid.hadoop.security.kerberos.principal</span>=<span class="hljs-string">hdfs-test@EXAMPLE.IO</span>
<span class="hljs-meta">druid.hadoop.security.kerberos.keytab</span>=<span class="hljs-string">/etc/security/keytabs/hdfs.headless.keytab</span>
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="restart-druid-services"></a><a href="#restart-druid-services" 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>Restart Druid Services</h3>
<p>With the above changes, restart Druid. This would ensure that Druid works with Kerberized Hadoop</p>
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