title: Why HDFS is write once and read multiple times?
body: <p>I am a new learner of Hadoop.</p>
  
  <p>While reading about Apache HDFS I learned that HDFS is write once file system. Some other distributions ( Cloudera) provides append feature. It will be good to know rational behind this design decision. In my humble opinion, this design creates lots of limitations on Hadoop and make it suitable for limited set of problems( problems similar to log analytic).</p>
  
  <p>Experts comment will help me to understand HDFS in better manner.</p>