void parsePB(final HFileProtos.FileInfoProto fip) {
    this.map.clear();
    for (BytesBytesPair pair : fip.getMapEntryList()) {
      this.map.put(pair.getFirst().toByteArray(), pair.getSecond().toByteArray());
    }
  }
Fill our map with content of the pb we read off disk
@param fip protobuf message to read
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileInfo.java