Configuring Data Fabric Client User on Windows

Before you use the Windows Client, configure it with information from your cluster.

Before running applications on the Windows Client, configure the core-site.xml file with the UID, GID, and user name of the cluster user that will be used to access the non-secure cluster.

Note: If you are on secure cluster, this configuration is not needed because on secure clusters, the username is available through the ticket.

Complete the following steps:

Obtain the UID and GID that has been set up for your user account. To determine the correct UID and GID values for your username, log into a cluster node and type the id command. In the following example, the UID is 1000 and the GID is 2000:
```
$ id
uid=1000(juser) gid=2000(juser) groups=4(adm),20(dialout),24(cdrom),46(plugdev),105(lpadmin),119(admin),122(sambashare),2000(juser)
```
Add the following parameters to the core-site.xml files that correspond to the version of the hadoop commands that you plan to run:
```
<property>
  <name>hadoop.spoofed.user.uid</name>
  <value>{UID}</value>
</property>
<property>
  <name>hadoop.spoofed.user.gid</name>
  <value>{GID}</value>
</property>
<property>
  <name>hadoop.spoofed.user.username</name>
  <value>{id of user who has UID}</value>
</property>
```
Warning: You must use the numeric values for UID and GID, not the text names.

Note: When wire-level security is implemented on Windows, spoofing is not supported. This greatly increases the security of the cluster, but the core-site.xml file settings above then have no effect.
For MapReduce version 2 or other applications that run on YARN, the core-site.xml file(s) that you need to edit is located at: %MAPR_HOME%\hadoop\hadoop-2.x.x\etc\hadoop\core-site.xml.