Help Center/ MapReduce Service/ User Guide/ MRS Cluster O&M/ MRS Cluster Alarm Handling Reference/ ALM-45589 ConfigNode Heap Memory Usage Exceeds the Threshold
Updated on 2024-09-23 GMT+08:00
View PDF
Share

ALM-45589 ConfigNode Heap Memory Usage Exceeds the Threshold

Alarm Description

The system checks the heap memory usage of the ConfigNode process every 60 seconds. This alarm is generated when the heap memory usage of the ConfigNode process exceeds the threshold (90% of the maximum memory). This alarm is cleared when the heap memory usage of the ConfigNode process is less than the threshold.

Alarm Attributes

Alarm ID

Alarm Severity

Auto Cleared

45589

Major

Yes

Alarm Parameters

Parameter

Description

Source

Specifies the cluster for which the alarm was generated.

ServiceName

Specifies the service for which the alarm was generated.

RoleName

Specifies the role for which the alarm was generated.

HostName

Specifies the host for which the alarm was generated.

Impact on the System

The read and write performance of the ConfigNode process deteriorates, memory overflow occurs, and the ConfigNode process breaks down.

Possible Causes

The heap memory configured for the node is improper. As a result, the usage exceeds the threshold.

Handling Procedure

Check the heap memory configuration.

  1. Log in to FusionInsight Manager and choose O&M > Alarm > Alarms. In the real-time alarm list, click in front of this alarm and view the role name and instance IP address in Location.
  2. Choose Cluster > Services > IoTDB. Click Instance, click the ConfigNode corresponding to the IP address obtained in 1, and check whether ConfigNode Heap Memory Usage on the Dashboard tab page reaches the threshold specified for the ConfigNode process.

    If the chart is not displayed, click the drop-down list in the upper right corner of the chart area and choose Customize > Memory. In the dialog box that is displayed, select ConfigNode Heap Memory Usage and click OK.

    You can choose O&M > Alarm > Threshold Configuration > Name of the desired cluster > IoTDB > Memory > ConfigNode Heap Memory Usage (ConfigNode) to view the threshold.

    • If yes, go to 3.
    • If no, go to 6.

  3. Choose Cluster > Services > IoTDB. Click Configurations then All Configurations, click ConfigNode, and choose System. Set -Xmx in GC_OPTS to a larger value and save the configuration.

    • The default value of -Xmx is 2G.
    • If this alarm is occasionally generated, increase the value of -Xmx by 0.5 times. If this alarm is frequently generated, double the value of -Xmx.
    • In the case of large service volume and high service concurrency, you are advised to add instances.

  4. Click Dashboard. Click Restart Service to restart the IoTDB service for the configuration to take effect.

    During the restart of the IoTDB service, read and write requests are interrupted.

  5. Wait for about 120 seconds and check whether the alarm is cleared.

    • If yes, no further action is required.
    • If no, go to 6.

Collect fault information.

  1. On FusionInsight Manager, choose O&M > Log > Download.
  2. Expand the Service drop-down list, select IoTDB for the target cluster, and click OK.
  3. Expand the Hosts drop-down list. In the Select Host dialog box that is displayed, select the hosts to which the role belongs, and click OK.
  4. Click in the upper right corner, and set Start Date and End Date for log collection to 30 minutes ahead of and after the alarm generation time respectively. Then, click Download.
  5. Contact O&M personnel and provide the collected logs.

Alarm Clearance

This alarm is automatically cleared after the fault is rectified.

Related Information

None