Apache Ambari Operations
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Understanding Alerts

Ambari predefines a set of alerts that monitor the cluster components and hosts. Each alert is defined by an alert definition, which specifies the alert type check interval and thresholds. When a cluster is created or modified, Ambari reads the alert definitions and creates alert instances for the specific items to monitor in the cluster. For example, if your cluster includes Hadoop Distributed File System (HDFS), there is an alert definition to monitor "DataNode Process". An instance of that alert definition is created for each DataNode in the cluster.

Using Ambari Web, you can browse the list of alerts defined for your cluster by clicking the Alerts tab. You can search and filter alert definitions by current status, by last status change, and by the service the alert definition is associated with (among other things). You can click alert definition name to view details about that alert, to modify the alert properties (such as check interval and thresholds), and to see the list of alert instances associated with that alert definition.

Each alert instance reports an alert status, defined by severity. The most common severity levels are OK, WARNING, and CRITICAL, but there are also severities for UNKNOWN and NONE. Alert notifications are sent when alert status changes (for example, status changes from OK to CRITICAL).

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Managing Notifications

Tables of Predefined Alerts