Hi Hadoop Devs, I have one question about the blockReport DataNode send to NameNode. I think NameNode get the blockReport from DataNode, then it can tell DataNode which block is invalid and which block should be replicated, But I look at the source code of method blockReport of NameNode, it always returns DatanodeCommand.FINALIZE or null. it makes me confused here. Could anybody help me understand what's the meaning of the code here ? And how does the NameNode tell DataNode which block should be delete ? Thanks for your help.
-- Best Regards Jeff Zhang
