The java org.apache.hadoop.security.UserGroupInformation is a class in the Apache Hadoop library that provides methods to obtain the current user's authentication and authorization information in a Hadoop cluster. It allows the applications running on the Hadoop cluster to access and manipulate user, group, and authentication-related information. This class provides mechanisms for authentication with Kerberos, as well as the ability to retrieve user and group information from various sources, like LDAP or Unix. It also offers methods for impersonation, allowing Hadoop applications to act on behalf of other users with the necessary permissions. UserGroupInformation is an essential component for secure, multi-user Hadoop applications.
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