title: How to dynamic change existing files' block size in Hadoop?
body: <p>I have a Hadoop cluster running. I use Hadoop API to create files in Hadoop. 
  For example using: create(Path f, boolean overwrite, int bufferSize, short replication, long blockSize, Progressable progress). </p>
  
  <p>I am wondering how I can change the blocksize of the file after the file has been created? Using command or any API or any other methods?
  Because I can't find function for changing the blocksize in the API. </p>
  
  <p>Thanks</p>