ALM-13006 Znode Number or Capacity Exceeds the Threshold

Alarm Description

The system periodically detects the status of secondary Znode in the ZooKeeper service data directory every four hours. This alarm is generated when the number or capacity of secondary Znodes exceeds the threshold.

Alarm Attributes

Alarm Parameters

Impact on the System

A large amount of data is written to the ZooKeeper data directory space. As a result, services of upstream components (such as Yarn, Flink, and Spark) that depend on this directory are abnormal. For details, see the alarm location information.

Possible Causes

A large amount of data is written to the ZooKeeper data directory. The threshold is not appropriate.

Handling Procedure

Check whether a large amount of data is written to the directory for which the alarm is generated.

1. On FusionInsight Manager, choose O&M > Alarm > Alarms. On the displayed interface, click the drop-down button of Znode Number or Capacity Exceeds the Threshold. Confirm the Znode for which the alarm is generated in Location Information.
2. Log in to FusionInsight Manager, open the ZooKeeper service interface, and select Resource. In the table Used Resources (By Second-Level Znode), check whether a large amount of data is written to the top-level Znode for which the alarm is reported.
   • If it is, go to 3.
   • If it is not, go to 4.

3. Log in to the ZooKeeper client and delete the data in the top-level Znode.
4. Log in to FusionInsight Manager and open the ZooKeeper service interface. On the Resource page, choose > By Znode quantity in Used Resources (By Second-Level Znode). Threshold Configuration of By Znode quantity is displayed. Click Modify under Operation. Increase the threshold by referringto the value of max.Znode.count by choosing Cluster > Name of the desired cluster > Services > ZooKeeper > Configurations > All Configurations > Quota.
5. In the Used Resources (By Second-Level Znode), choose > By capacity. The Threshold Settings page of By Capacity is displayed. Click Modify under Operation. Increase the threshold by referring to the value of max.data.size by choosing Cluster > Name of the desired cluster > Services > ZooKeeper > Configurations > All Configurations > Quota.
6. Check whether the alarm is cleared.
   • If it is, no further action is required.
   • If it is not, go to 7.

Collect fault information.

7. On the FusionInsight Manager portal, choose O&M > Log > Download.
8. Select ZooKeeper in the required cluster from the Service.
9. Click 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.
10. Contact the O&M engineers and send the collected logs.

Alarm Clearance

After the fault is rectified, the system automatically clears this alarm.

Related Information

None.