It looks like some of the DataNodes are not in sync, first try restarting your DataNodes.
If you continue to receive the errors, please check the following:
1. Please check /etc/hosts file, it should be in sync on all the DataNodes and NameNodes if you are not using DNS.
2. Please check if iptables is running on few DataNodes, apply a for loop and quickly check on all the DataNodes.
3. Please check if time is in sync on all the DataNodes. Time on NameNode and Datanodes should be in sync.