title: Hadoop Mapper: Appropriate input files size?
body: <p>I have clusters HDFS block size is 64 MB. I have directory containing 100 plain text files, each of which is is 100 MB in size. The <code>InputFormat</code> for the job is <code>TextInputFormat</code>. How many Mappers will run?</p>
  
  <p>I saw this question in Hadoop Developer exam. Answer is 100. Other three answer options were 64, 640, 200. But I am not sure how 100 comes or answer is wrong.</p>
  
  <p>Please guide. Thanks in advance.</p>