8.1. Define Users and Groups

The following table describes system user account and groups. Use this table to define what you are going to use in setting up your environment. These users and groups should reflect the accounts you created in Create System Users and Groups.

	Note
	The `scripts.zip` file you downloaded in Download Companion Files includes a script, `usersAndGroups.sh` for setting user and group environment parameters. We strongly suggest you edit and source (alternatively, you can also copy the contents to your `~/.bash_profile`) to set up these environment variables in your environment.

Table 1.2. Define Users and Groups for Systems

Parameter	Definition
`HDFS_USER`	User owning the HDFS services. For example, `hdfs`.
`MAPRED_USER`	User owning the MapReduce services. For example, `mapred`.
`ZOOKEEPER_USER`	User owning the ZooKeeper services. For example, `zookeeper`.
`HIVE_USER`	User owning the Hive services. For example, `hive.`
`WEBHCAT_USER`	User owning the WebHCat services. For example, `hcat`.
`HBASE_USER`	User owning the HBase services. For example, `hbase`.
`OOZIE_USER`	User owning the Oozie services. For example, `oozie`.
`PIG_USER`	User owning the Pig services. For example, `pig`.
`HADOOP_GROUP`	A common group shared by services. For example, `hadoop`.

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