I'm on CDH4, and trying to recover both the namenode and cloudera manager VMs from HDFS after losing the namenode.
All of our backup VMs are on HDFS, so for the moment I just want to hack something together, copy the backup VMs off HDFS and get on with properly reconfiguring via CDH Manger. So I've installed a plain 'ol namenode on one of my cluster nodes and started it with -importCheckpoint (with the data from the secondary NN), this seems to have worked, I have a namenode web UI up which expects to find 32178 blocks. But my plain namenode (on the same hostname and IP as the old namenode) says that there are no datanodes in the cluster. What do I need in order to configure the datanodes to report their blocks into this new namenode (same IP & hostname)? Thanks, David
