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.

Cloudera Manager supports the following categories of events:
Category Description
ACTIVITY_EVENT 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 must specify activity duration rules.
AUDIT_EVENT Generated by actions performed
  • In Cloudera Manager, such as creating, configuring, starting, stopping, and deleting services or roles
  • By services that are being audited by Cloudera Navigator.
HBASE Generated by HBase with the exception of log messages, which have the LOG_MESSAGE category.
HEALTH_CHECK Indicate that certain health test activities have occurred, or that health test results have met specific conditions (thresholds).

Thresholds for various health tests can be set under the Configuration tabs for HBase, HDFS, Impala, and MapReduce service instances, at both the service and role level.

LOG_MESSAGE 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.
SYSTEM Generated by system events such as parcel availability.

For detailed information on each supported event, see the Cloudera Manager Events reference documentation.