title: Hadoop's passage of parameter
body: <p>I've known that a writable object can be passed to mapper using something like:</p>
  
  <p>DefaultStringifier.store(conf, object ,"key");</p>
  
  <p>object = DefaultStringifier.load(conf, "key", Class );</p>
  
  <p>My question is:</p>
  
  <p>In a mapper I read out the object then change the value of this object,</p>
  
  <p>for example: object=another .</p>
  
  <p>How to do to make sure that the change of the object's value</p>
  
  <p>could be known by the next time of mapper task?</p>
  
  <p>Is there any better way to pass parameter to mapper?</p>