ALM-19015 Quantity Quota Usage on ZooKeeper Exceeds the Threshold

Updated on 2024-11-29 GMT+08:00

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Alarm Description

The system checks the ZNode usage of the HBase service every 120 seconds. This alarm is generated when the system detects that the ZNode quantity usage of the HBase service exceeds the alarm threshold (75% by default).

This alarm is cleared when the ZNode quantity usage is less than the alarm threshold.

Alarm Attributes

Alarm ID	Alarm Severity	Alarm Type	Service Type	Auto Cleared
19015	Major	Quality of service	HBase	Yes

Alarm Parameters

Type	Parameter	Description
Location Information	Source	Specifies the cluster for which the alarm is generated.
	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.
Additional Information	Threshold	Specifies the threshold for generating the alarm.

Impact on the System

This alarm indicates that the ZNode quantity usage in the HBase service has exceeded the threshold. If this alarm is not handled in a timely manner, the problem severity may be escalated to Critical and data fails to be written.

Possible Causes

DR is configured for HBase, and data synchronization fails or is slow in DR.
A large number of WAL files are being split in the HBase cluster.

Handling Procedure

Check the quantity quota and usage of ZNodes.

On FusionInsight Manager, choose O&M > Alarm > Alarms, select the alarm whose ID is 19015, and view the threshold in Additional Information.
Log in to the HBase client as user root. Run the following command to go to the client installation directory:

cd Client installation directory

Run the following command to set environment variables:

source bigdata_env

If the cluster uses the security mode, run the following command to perform security authentication:

kinit hbase

Enter the password as prompted (obtain the password from the MRS cluster administrator).
Run the hbase zkcli command to log in to the ZooKeeper client and run the listquota /hbase command to check the ZNode quantity quota of the HBase service. The ZNode root directory in the command is specified by the zookeeper.znode.parent parameter of the HBase service. The marked area in the following figure shows the quantity quota configuration of the root ZNode of the HBase service.
Run the getusage /hbase/splitWAL command to check the ZNode quantity usage and check whether the ratio of Node count in the command output to the ZNode quantity quota is close to the alarm threshold.
- If yes, go to 5.
- If no, go to 6.
On FusionInsight Manager, choose O&M > Alarm > Alarms. Check whether the alarm whose ID is 12007, 19000, or 19013 and the ServiceName in Location is the current HBase service exists.
- If yes, click View Help next to the alarm and rectify the fault by referring to the help document. Then, go to 8.
- If no, go to 9.
Run the getusage /hbase/replication command to check the ZNode quantity usage and check whether the ratio of Node count in the command output to the ZNode quantity quota is close to the alarm threshold.
- If yes, go to 7.
- If no, go to 9.
On FusionInsight Manager, choose O&M > Alarm > Alarms. Check whether the alarm whose ID is 19006 and ServiceName in Location is the current HBase service exists.
- If yes, click View Help next to the alarm and rectify the fault by referring to the help document. Then, go to 8.
- If no, go to 9.
Check whether the alarm is cleared.
- If yes, no further action is required.
- If no, go to 9.

Collect fault information.

On FusionInsight Manager, choose O&M. In the navigation pane on the left, choose Log > Download.
Expand the Service drop-down list, and select HBase for the target cluster.
Click the edit icon in the upper right corner, and set Start Date and End Date for log collection to 10 minutes ahead of and after the alarm generation time, respectively. Then, click Download.
Contact O&M engineers and provide the collected logs.