This alert is triggered if the RegionServer processes 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.
Misconfiguration or less-than-ideal configuration has caused the RegionServers to crash
Cascading failures brought on by some workload has caused the RegionServers to crash
The RegionServers have shut themselves down on their own because there were problems in the dependent services, ZooKeeper or HDFS
GC paused the RegionServer for too long and the RegionServers lost contact with Zookeeper
Check the dependent services to make sure they are operating correctly
Look at the RegionServer log files (usually
/var/log/hbase/*.log) for further informationLook at the configuration files (
/etc/hbase/conf)If the failure was associated with a particular workload, try to understand the workload better
Restart the RegionServers
