This alert is triggered if the JobTracker operations RPC latency exceeds the configured
critical threshold. Typically an increase in the RPC processing time increases the RPC queue
length, causing the average queue wait time to increase for JobTracker operations. This
alert uses the Nagios check_rpcq_latency plugin.
High load on the JobTracker in terms of the number of tasks being scheduled and completed. For example, a large number of very short-running tasks which cause extreme load on the JobTracker could cause this. Using CapacityScheduler should usually prevent this from occurring.
