The Monitor daemon probes the health of the NameNode at a regular interval, and stops sending heartbeats to vSphere when any of the probes fail. Use the following property to change the rate of probes:
<property> <name>service.monitor.probe.interval</name> <value>11000</value> <description> Time in milliseconds between the last probe cycle ending and the new one beginning. The shorter this cycle, the faster failures are detected, but more CPU, network, and server load can be generated. </description> </property>
The smaller the interval between probes, the faster it becomes to detect and report service failures. Although, this might increase the load on the service and the CPU slightly, but even with a very short probing interval, vSphere will not trigger VM restart for at least thirty seconds after the probe failure.
