The org.apache.accumulo.examples.simple.filedata.FileDataIngest class
generates LOWERCASE hash keys via the hexString() method, and uses them as
row ID's for storing file chunks in Accumulo. Note that NIST uses
UPPERCASE hash keys in the Reference Data Set (RDS). See
http://www.nsrl.nist.gov/ for the RDS. Both approaches are valid since the
hexadecimal representation of the key is not case sensitive - but make sure
you normalize to one case if you are comparing the keys generated in the
FileDataIngest class to the RDS keys.
