@Override
    public DataChecksum.Type getDataChecksumType() {
      return DataChecksum.Type.CRC32;
    }
Checksum types. The Checksum type is a one byte number that stores a representation of the
checksum algorithm used to encode a hfile. The ordinal of these cannot change or else you risk
breaking all existing HFiles out there.
hbase-common/src/main/java/org/apache/hadoop/hbase/util/ChecksumType.java