This alert is triggered if the JobTracker process cannot be confirmed to be up and
listening on the network for the configured critical threshold, given in seconds. It uses
the Nagios check_tcp plugin.
The JobTracker daemon is down for reasons such as
OutOfMemoryerrors or the misconfiguration of JobTracker, etc. Using CapacityScheduler should usually prevent this issue from occurring.There are hardware problems on the JobTracker host
