int miss = 0;
long totalBytes = 0;
FSDataInputStream fsdis = fs.open(path);
Reader reader = HFile.createReaderFromStream(path, fsdis,
fs.getFileStatus(path).getLen(), new CacheConfig(conf));
reader.loadFileInfo();
KeySampler kSampler =
new KeySampler(rng, reader.getFirstKey(), reader.getLastKey(),
keyLenGen);
HFileScanner scanner = reader.getScanner(false, USE_PREAD);
BytesWritable key = new BytesWritable();