title: Parquet metadata files useful on HDFS?
body: <p>We use Spark to generate parquet files on HDFS.</p>
  
  <p>Spark generate 4 files, the parquet with data, and 3 meta-data files. The thing is, the 3 meta-data files take 1 block, here 128M, as we run many tasks like this, this could take lot of space for nothing.</p>
  
  <p>Are there files needed? Or is it a good way to deal with?</p>