[HDFS-2363] Move datanodes size printing to BlockManager from FSNameSystem's metasave API

• Type: Sub-task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.23.0, 2.0.0-alpha
• Fix Version/s: 0.23.0
• Component/s: namenode
• Hadoop Flags: Reviewed
• Assignee: Uma Maheswara Rao G
• Reporter: Uma Maheswara Rao G
• Created: 26/Sep/11 11:54
• Updated: 16/Mar/15 18:07
• Resolved: 28/Sep/11 06:02

Description

      final List<DatanodeDescriptor> live = new ArrayList<DatanodeDescriptor>();
      final List<DatanodeDescriptor> dead = new ArrayList<DatanodeDescriptor>();
      blockManager.getDatanodeManager().fetchDatanodes(live, dead, false);
      out.println("Live Datanodes: "+live.size());
      out.println("Dead Datanodes: "+dead.size());
      blockManager.metaSave(out);

Logically all the dataNode related logic can be moved to BlockManager.

So, here metaSave API is getting the DataNodes details from blockManager to FsNameSystem and after printing the details again it is giving the control to blockManager.

It will be good to move the DNs size printing code also to BlockManager.