Setting up o3fs

Select the Ozone bucket to configure o3fs and add specific properties to core-site.xml.

Select the Ozone bucket on which you want o3fs to reside.
If you do not have a designated volume or bucket for o3fs, create them using the required commands:
```
ozone sh volume create /volume
ozone sh bucket create /volume/bucket
```

Add the properties fs.o3fs.impl and fs.default.name to core-site.xml.

Adding these properties makes the bucket as the default file system for HDFS dfs commands and registers the o3fs file system type.

<property>
  <name>fs.o3fs.impl</name>
  <value>org.apache.hadoop.fs.ozone.OzoneFileSystem</value>
</property>
<property>
  <name>fs.defaultFS</name>
  <value>o3fs://bucket.volume.OzoneServiceId</value>
</property>

Add the ozone-filesystem-hadoop3.jar to the classpath.
```
export HADOOP_CLASSPATH=/opt/ozone/share/ozonefs/lib/hadoop-ozone-filesystem-hadoop3-*.jar:$HADOOP_CLASSPATH
```
note
With Hadoop 2.x, use the hadoop-ozone-filesystem-hadoop2-*.jar.
After setting up o3fs, you can run hdfs commands such as the following on Ozone:
- hdfs dfs -ls /
- hdfs dfs -mkdir /users
Now, applications such as Hive and Spark can run on this file system after some basic configuration changes.
note
Any keys that are created or deleted in the bucket using methods other than o3fs are displayed as directories and files in o3fs.

Setting up o3fs

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