ALM-14007 HDFS NameNode Memory Usage Exceeds the Threshold (For MRS 2.x or Earlier)

Description

The system checks the HDFS NameNode memory usage every 30 seconds and compares the actual memory usage with the threshold. The HDFS NameNode memory usage has a default threshold. This alarm is generated when the HDFS NameNode memory usage exceeds the threshold.

This alarm is cleared when the HDFS NameNode memory usage is less than or equal to the threshold.

Attribute

Alarm ID	Alarm Severity	Auto Clear
14007	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

If the memory usage of the HDFS NameNode is too high, data read/write performance of HDFS will be affected.

Possible Causes

The HDFS NameNode memory is insufficient.

Procedure

Delete unnecessary files.
1. Use the client on the cluster node and run the hdfs dfs -rm -r file or directory path command to delete unnecessary files.
2. Wait 5 minutes and check whether the alarm is cleared.
  - If yes, no further action is required.
  - If no, go to 2.
Collect fault information.
1. On MRS Manager, choose System > Export Log.
2. Contact the O&M engineers and send the collected logs.