title: Block pool in hadoop
body: <p>I was going through Hadoop tutorials, i got below doubt regarding Block pool in hadoop.</p>
  
  <p><strong>Block pool- Basically each block pools are managed independently from one another, each one is a set of blocks that belong to a single namespace.</strong></p>
  
  <p>Is that block pool is virtual concept or is it something like metadat on blocks which is maintained in memory ? </p>