5.1.5. NameNode host CPU utilization

This host-level alert is triggered if the percent of CPU utilization on the master host exceeds the configured critical threshold. It uses the Nagios check_snmp_load plug-in.

5.1.5.1. Potential causes

Unusually high CPU utilization: Can be caused by a very unusual job/query workload, but this is generally the sign of an issue in the daemon.
A down SNMP daemon on the master node, producing an unknown status

5.1.5.2. Possible remedies

Use the top command to determine which processes are consuming excess CPU.
Reset the offending process
Check the status of the SNMP daemon

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