Events
An event is a record that something of interest has occurred – a service's health has changed state, a log message (of the appropriate severity) has been logged, and so on. Many events are enabled and configured by default.
From the Events page you can filter for events for services or role instances, hosts, users, commands, and much more. You can also search against the content information returned by the event.
The Event Server aggregates relevant events and makes them available for alerting and for searching. This way, you have a view into the history of all relevant events that occur cluster-wide.
Health Check Events | These events indicate that certain health check
activities have occurred, or that health check results have met specific conditions
(thresholds). Thresholds for various health checks can be set under the Configuration tabs for HDFS and MapReduce service instances, at both the service and role level. It is also supported for HBase and Impala with HBase and Impala monitoring licenses. See Configuring Monitoring Settings for more information. |
Configuration Change Events | These events indicate that certain configurations have been changed. |
Log Message Events | These events are generated for certain types of log messages from HDFS, MapReduce, and HBase services and roles. Log events are created when a log entry matches a set of rules for identifying messages of interest. The default set of rules is based on Cloudera experience supporting Hadoop clusters. You can configure additional log event rules if necessary. |
Audit Events | These are events generated by actions taken through Cloudera Manager, such as creating, deleting, starting, or stopping services or roles. |
Activity Events | These are events generated by the Activity Monitor; specifically, for jobs that fail, or that run slowly (as determined by comparison with duration limits). In order to monitor your workload for slow-running jobs, you need to set up Activity Duration Rules. |
These events are available for alerting and searching.