title: How to Override InputFormat and OutputFormat In hadoop Application
body: <p>I have an application which need to read a file which is a serialized result of ArrayList.(<code>ArrayList&lt;String&gt;</code>, 50000 records in this list, size: 20MB)
  I don't know exactly how to read the data in to hadoop platform. I only have some sense I need to override InputFormat and OutpurFormat.
  I'm a beginner in hadoop platform. Could you give me some advise?</p>
  
  <p>Thanks,</p>
  
  <p>Zheng.</p>