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Set up WebHCat Proxy User

You must set up an HDFS proxy user for WebHCat and a WebHCat proxy user for the Ambari Server daemon account.

To setup the HDFS proxy user for WebHCat :

Steps

  1. In Ambari Web, browse to Services > HDFS > Configs.

  2. Under the Advanced tab, navigate to the Custom core-site section.

  3. Click Add Property… to add the following custom properties:

    hadoop.proxyuser.hcat.groups=*
    hadoop.proxyuser.hcat.hosts=*
  4. Save the configuration change and restart the required components as indicated by Ambari.

To setup a WebHCat proxy user for the Ambari Server daemon account, you need to configure the proxy user in the WebHCat configuration. This configuration is determined by the account name the ambari -server daemon is running as. For example, if your ambari -server is running as root, you set up an WebHCat proxy user for root with the following:

Steps

  1. In Ambari Web, browse to Services > Hive > Configs.

  2. Under the Advanced tab, navigate to the Custom webhcat-site section.

  3. Click Add Property… to add the following custom properties:

    webhcat.proxyuser.root.groups=*
    webhcat.proxyuser.root.hosts=*

    Notice the ambari-server daemon account name root is part of the property name. Be sure to modify this property name for the account name you are running the ambari-server as. For example, if you were running ambari-server daemon under an account name of ambariusr, you would use the following properties instead:

    webhcat.proxyuser.ambariusr.groups=*
    webhcat.proxyuser.ambariusr.hosts=*

    Similarly, if you have configured Ambari Server for Kerberos, be sure to modify this property name for the primary Kerberos principal user. For example, if ambari-server is setup for Kerberos using principal ambari-server@EXAMPLE.COM, you would use the following properties instead:

    webhcat.proxyuser.ambari-server.groups=*
    webhcat.proxyuser.ambari-server.hosts=*
  4. Save the configuration change and restart the required components as indicated by Ambari.

More Information

Ambari Server for Kerberos