I realize that netstat -lpn | grep 1022 command not display all port so I use netstat -nap | grep 1022 command I found a process run on this port tcp 0 0 10.10.201.106:1022 10.10.201.10:2049 ESTABLISHED -   Not sure what process it is, seems OS process. So we try to restart the node I after it I find that port 1022 is free. Datanode is successfully started after it.   It is not good to set <1024 for any process, I'll plan to modify all non-standard port on our cluster to the standard one. ... View more