Description

The system checks the number of lost NodeManager nodes every 30 seconds, and compares the number of lost nodes with the threshold. The Lost Nodes indicator has a default threshold. This alarm is generated when the value of the Lost Nodes indicator exceeds the threshold.

This alarm is cleared when the value of Lost Nodes is less than or equal to the threshold.

Attribute

Alarm ID	Alarm Severity	Auto Clear
18002	Major	Yes

Parameters

Parameter	Description
ServiceName	Specifies the service for which the alarm is generated.
RoleName	Specifies the role for which the alarm is generated.
HostName	Specifies the host for which the alarm is generated.
Trigger condition	Generates an alarm when the actual indicator value exceeds the specified threshold.

Impact on the System

The lost NodeManager node cannot provide the Yarn service.
The number of containers decreases, so the cluster performance deteriorates.

Possible Causes

NodeManager is forcibly deleted without decommission.
All NodeManager instances are stopped or the NodeManager process is faulty.
The host where the NodeManager node resides is faulty.
The network between the NodeManager and ResourceManager is disconnected or busy.

Procedure

Collect fault information.
1. On MRS Manager, choose System > Export Log.
2. Contact technical support engineers for help. For details, see technical support.

Reference

None