Ambari Views Guide
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Configuring Your Cluster

For the Pig View to access HDFS, the Ambari Server daemon hosting the view needs to act as the proxy user for HDFS. This allows Ambari to submit requests to HDFS on behalf of the users using the Pig View. This is critical since the Pig View will store metadata about the user Pig scripts. This also means users that will access the Pig View must have a user directory setup in HDFS. In addition, the Pig View uses WebHCat to submit Pig scripts so the View needs a proxy user for WebHCat.