Manage Event Center (Hadoop clusters)

E-MapReduce (EMR) records events that occur in a Hadoop cluster in Event Center and automatically synchronizes them to CloudMonitor. Use Event Center to browse and filter cluster events, then subscribe to alert rules so your team receives proactive notifications when issues arise.

Limitations

Only events from Hadoop clusters created on the EMR on ECS page appear in Events. For events from DataLake, Dataflow, online analytical processing (OLAP), DataServing, or custom clusters, see Manage events.
Only health check events from the services and components of Hadoop clusters appear in Events. Health check events record risks and exceptions in services and components.

View events in Event Center

Open the Event Center tab.
1. Log on to the EMR console. In the left-side navigation pane, click EMR on ECS.
2. In the top navigation bar, select the region where your cluster resides and select a resource group.
3. On the EMR on ECS page, find the cluster and click its ID.
4. Click the Monitoring tab, then click Event Center.

Set filter conditions to query events. Use any combination of the following filters: Event Code, Event Level, Event Source, Event Type, and Select Time.

Use event levels to set up differentiated alerts — for example, configure a Warning-level alert for early detection and a Critical-level alert for immediate response. This lets on-call teams prioritize without being flooded by low-severity notifications.

Event Level

Value	Description
CRITICAL	Critical
WARN	Warning
INFO	Information

Event Type

Value	Description
Cluster	Records status changes of cluster resources, including clusters, node groups, and services.
System	Records events in the control service automation process. Not triggered by users.
HealthCheck	Records exceptions in services, components, and hosts. Supported services: YARN, HDFS, Hive, Spark, ZooKeeper, Kudu, HBase, ClickHouse, Doris, StarRocks, Flink, Kafka, Presto, Tez, Kyuubi, Impala, Knox, OpenLDAP, and Ranger.

Find the event and click Details in the Actions column. The event details panel shows the following parameters.

Parameter	Description
Event Code	Code of the event. Use the event code to search for events of the same type.
Event Name	Name of the event.
Event Level	Severity level of the event. Valid values: INFO, WARN, CRITICAL.
Occurred At	Time when the event occurred.
Event Type	Type of the event. Valid values: Cluster, System, HealthCheck.
Event Source	Source that triggered the event. Valid values: HostName (node), Component (component), Service (service).
Event Content	Detailed description of the event.

Subscribe to event-triggered alerts

Click Subscribe to Event-triggered Alert in the upper-right corner of the Event Center tab. This opens the CloudMonitor console, where you configure alert rules.

For step-by-step instructions, see Create an event-triggered alert rule.

What's next

Create an event-triggered alert rule — configure conditions, notification channels, and rule names in CloudMonitor.
Manage events — view events for DataLake, Dataflow, OLAP, DataServing, and custom clusters.