message: Change the TF record reader to use 16MB buffering by default in order to improve performance.
diff: @@ -43,9 +43,10 @@ PyRecordReader* PyRecordReader::New(const string& filename, uint64 start_offset,
  reader->offset_ = start_offset;
  reader->file_ = file.release();
  + static const uint64 kReaderBufferSize = 16 * 1024 * 1024;
  RecordReaderOptions options =
  RecordReaderOptions::CreateRecordReaderOptions(compression_type_string);
  -
  + options.buffer_size = kReaderBufferSize;
  reader->reader_ = new RecordReader(reader->file_, options);
  return reader;
  }
  