title: Hadoop Immutable vs Data type mutable
body: <p>I am kind of newbie in Big Data world and trying to learn Hadoop. One thing that surprises me is that BIG data or Hadoop is by default supports immutability nature as we want to write the data once and read many times as well as immutability is best option in distributed storage and processing world. At the same time, I read that all Data types in Hadoop which implements Writable interface are mutable in nature to support the serialization in framework. I am confused here when all data types are mutable then how immutability will be supported in Hadoop as whole ? Is not both things contradictory ?</p>
  
  <p>Thanks in advance for answering my question.</p>