title: So to send all records in SequenceFile to one mapper instance?
body: <p>First, I know this is totally against the purpose of hadoop, parallelism, and MR.  That being said I have a very specific use case.</p>
  
  <p>I want to send the contents of an entire sequence file, no matter how big, to a single mapper instance but cant figure out how to handle this.</p>
  
  <p>I know I can do this in a reducer by using an identity mapper, but I don't want to go through the overhead of sorting / grouping to get the data into the reducer.  </p>
  
  <p>I also know that I can just read a sequence file locally without mappers or reducers, but that doesn't fit my use case either.</p>