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In the above example, the flume user impersonates the user will. This will only be allowed if KDC authenticates the principal, and the Namenode authorizes impersonation of the specified proxy user by the provided principal.

Directly accessing Hadoop as the Kerberos principal

If only one user is needed, then the proxyUser configuration option may be omitted. In this case, the user indicated by the Kerberos principal is used to access Hadoop directly.