I had a 3 node cluster, in that node#1 has both DN + NN and node#2 & node#3 has only DN. Now Node#2 & Node#3 were down. And i had free RAM and free disk space available in Node#1.   Ideally Hadoop should replicate the blocks from dead nodes i.e. Node#2&3 and should be recreated in Node#1 itself to maintain replication factor 3. But it is not happening. I had waited for hours, but not seeing any progress and showing the same health issues in cloudera manager.     Note: The same behaviour is also observed when only Node#3 is down and Node#1 & Node#2 are up and running.   Can someone please respond why this is happening? ... View more