title: AWS Glue Crawler Unable to Classify CSV files
body: <p>I'm unable to get the default crawler classifier, nor a custom classifier to work against many of my CSV files.  The classification is listed as 'UNKNOWN'. I've tried re-running existing classifiers, as well as creating new ones.  Is anyone aware of a specific configuration for a custom classifier for CSV files that works for files of any size?</p>
  
  <p>I'm also unable to find any errors specific to this issue in the logs. </p>
  
  <p>Although I have seen reference to issues for JSON files over 1MB in size, I can't find anything detailing this same issue for CSV files, nor a solution to the problem.</p>
  
  <ul>
  <li><a href="https://stackoverflow.com/questions/50954330/aws-crawler-could-not-classify-the-file-type-stores-in-s3-if-its-size-1mb?rq=1">AWS crawler could not classify the file type stores in S3 if its size &gt;1MB</a></li>
  <li><a href="https://stackoverflow.com/questions/46936721/aws-glue-crawler-classifies-json-file-as-unknown">AWS Glue Crawler Classifies json file as UNKNOWN</a></li>
  </ul>