Description

The system checks the number of damaged blocks every 30 seconds and compares the number of damaged blocks with the threshold. The damaged blocks indicator has a default threshold. This alarm is generated when the number of damaged blocks exceeds the threshold.

This alarm is cleared when the number of damaged blocks is less than or equal to the threshold. You are advised to run the hdfs fsck / command to check whether any file is completely damaged.

Attribute

Alarm ID	Alarm Severity	Auto Clear
14004	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.
NSName	Specifies the NameService service for which the alarm is generated.
Trigger condition	Generates an alarm when the actual indicator value exceeds the specified threshold.

Impact on the System

Data is damaged and HDFS fails to read files.

Possible Causes

The DataNode instance is abnormal.
Data verification information is damaged.

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