public void setDisplayName(String displayName) {
    this.displayName = displayName;
  }
Sets the display name for this user.
<p>
This value may be used in user interfaces rather than the username to show who it logged in. If
empty, it is expected that the user's {@link #userName} value would be used instead.

@param displayName the user's display name
ambari-server/src/main/java/org/apache/ambari/server/orm/entities/UserEntity.java