Let’s say you need to run the distcp command:
hadoop distcp -Dmapreduce.map.memory.mb=1000 -m 200 hdfs://node1:8020/your/folder1 hdfs://node1:8020/your/folder2
But as a result, you get an error like this:
ERROR tools.DistCp: Invalid arguments: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.StandbyException): Operation category READ is not supported in state standby. Visit https://s.apache.org/sbnn-error
One of the non-obvious reasons for such an error may be that node1:8020 is not an active node. Recheck the hostname and run the command again.
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