i tried swapping two hot-swap sata drives between two nodes in a cluster, but it didn't work: after restart, one of the datanodes shut down since namenode said it reported a block belonging to another node, which i guess namenode thinks is a fatal error. is this caused by the hadoop/datanode/current/VERSION file having the IP address and other ID information of the datanode hard-coded? it'd be great to be able to do a manual gross cluster rebalance by just physically swapping hard drives, but seems like this is not possible in the current version 0.18.3.
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