Alerts

The Management Pack for Apache Hadoop creates alerts (and in some cases provides recommended actions) based on various symptoms it detects in your Apache Hadoop Environment. See the table below for the list of alerts available in the Management Pack.

Alerts List

Name	Description	Symptom	Recommendation
Node Managers Unhealthy Immediate	Node Manager(s) have failed YARN health checks.	Node Managers Unhealthy	Check that NodeManagers have adequate disk space available.
Node Managers Unhealthy Critical	Node Manager(s) have failed YARN health checks.	Node Managers Unhealthy	Check that NodeManagers have adequate disk space available.
NameNode High Availability State Changed	NameNode is now the active NameNode.	NameNode High Availability Failover Occurred	If unplanned, check the status of the previously active NameNode.
NameNode Missing Blocks	Blocks missing. NameNode may be unhealthy.	NameNode Missing Blocks	Check for NameNode in maintenance.
NameNode Unreachable	NameNode is unreachable.	NameNode Unreachable	Check the NameNode to ensure it is functional.
NameNode Volume Failures	At least one volume has failed.	NameNode Volume Failures	Replace volume or NameNode to prevent data loss.
NameNode Volume Failures	At least one volume has failed.	NameNode Volume Failures	Replace volume or NameNode to prevent data loss.
NameNode Dead DataNodes	At least one DataNode is dead.	NameNode Number of DataNodes Dead	Replace DataNode to prevent data loss.
DataNode Used Capacity	Used disk capacity threshold exceeded.	DataNode Used Capacity	Add disks to DataNode.
DataNode Unreachable	DataNode is unreachable.	DataNode Unreachable	Check the DataNode to ensure it is functional.
DataNode Dead	DataNode is Dead.	DataNode Dead	Check the DataNode to ensure it is functional.
DataNode Decommissioned	DataNode is Decommissioned.	DataNode Decommissioned	Check the DataNode to ensure it is functional.
ResourceManager Unreachable	ResourceManager is unreachable	ResourceManager Unreachable	Check the ResourceManager to ensure it is functional.
ResourceManager Used Memory	Used disk capacity threshold exceeded.	ResourceManager Used Memory	Add DataNodes or disks to existing DataNodes.
ResourceManager Used Memory	Used disk capacity threshold exceeded.	ResourceManager Used Memory	Add DataNodes or disks to existing DataNodes.
ResourceManager High Availability State Changed	ResourceManager is now the active ResourceManager.	ResourceManager High Availability Failover Occurred	If unplanned, check the status of the previously active ResourceManager.
NodeManager Unreachable	NodeManager is unreachable.	NodeManager Unreachable	Check the NodeManager to ensure it is functional.