61 lines
2.0 KiB
Markdown
61 lines
2.0 KiB
Markdown
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---
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title: Running concurrently with HDFS
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weight: 1
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menu:
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main:
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parent: Starting
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weight: 4
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---
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Ozone is designed to work with HDFS. So it is easy to deploy ozone in an
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existing HDFS cluster.
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Ozone does *not* support security today. It is a work in progress and tracked
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in
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[HDDS-4](https://issues.apache.org/jira/browse/HDDS-4). If you enable ozone
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in a secure HDFS cluster, for your own protection Ozone will refuse to work.
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In other words, till Ozone security work is done, Ozone will not work in any
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secure clusters.
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The container manager part of Ozone runs inside DataNodes as a pluggable module.
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To activate ozone you should define the service plugin implementation class.
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<div class="alert alert-warning" role="alert">
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<b>Important</b>: It should be added to the <b>hdfs-site.xml</b> as the plugin should
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be activated as part of the normal HDFS Datanode bootstrap.
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</div>
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{{< highlight xml >}}
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<property>
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<name>dfs.datanode.plugins</name>
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<value>org.apache.hadoop.ozone.HddsDatanodeService</value>
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</property>
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{{< /highlight >}}
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You also need to add the ozone-datanode-plugin jar file to the classpath:
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{{< highlight bash >}}
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export HADOOP_CLASSPATH=/opt/ozone/share/hadoop/ozoneplugin/hadoop-ozone-datanode-plugin.jar
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{{< /highlight >}}
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To start ozone with HDFS you should start the the following components:
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1. HDFS Namenode (from Hadoop distribution)
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2. HDFS Datanode (from the Hadoop distribution with the plugin on the
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classpath from the Ozone distribution)
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3. Ozone Manager (from the Ozone distribution)
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4. Storage Container manager (from the Ozone distribution)
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Please check the log of the datanode whether the HDDS/Ozone plugin is started or
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not. Log of datanode should contain something like this:
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```
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2018-09-17 16:19:24 INFO HddsDatanodeService:158 - Started plug-in org.apache.hadoop.ozone.web.OzoneHddsDatanodeService@6f94fb9d
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```
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<div class="alert alert-warning" role="alert">
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<b>Note:</b> The current version of Ozone is tested with Hadoop 3.1.
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</div>
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