Help Center/ MapReduce Service/ User Guide/ Alarm Reference (Applicable to MRS 3.x)/ ALM-45738 TokenServer Direct Memory Usage Exceeds the Threshold
Updated on 2024-04-11 GMT+08:00
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ALM-45738 TokenServer Direct Memory Usage Exceeds the Threshold

Alarm Description

The system checks the direct memory usage of the TokenServer service every 60 seconds. This alarm is generated when the direct memory usage of the TokenServer instance exceeds the threshold (80% of the maximum memory) for five consecutive times.

This alarm is automatically cleared when the system detects that the TokenServer direct memory usage is less than or equal to the threshold.

Alarm Attributes

Alarm ID

Alarm Severity

Auto Cleared

45738

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.

Trigger Condition

Specifies the threshold for triggering the alarm.

Impact on the System

Direct memory overflow may cause service unavailability.

Possible Causes

The direct memory of the TokenServer process is overused or the direct memory is inappropriately allocated.

Handling Procedure

Check the direct memory usage.

  1. Log in to FusionInsight Manager and choose O&M > Alarm > Alarms > ALM-45738 TokenServer Direct Memory Usage Exceeds the Threshold. Check the location information of the alarm and view the host name of the instance for which the alarm is generated.
  2. On FusionInsight Manager, choose Cluster > Services > Guardian. On the page that is displayed, click the Instance tab. On this tab page, select the role corresponding to the host name of the instance for which the alarm is generated. Click the drop-down list in the upper right corner of the chart area and choose Customize > CPU and Memory > TokenServer Direct Memory Usage. Then click OK.
  3. Check whether the direct memory used by TokenServer reaches the threshold (80% of the maximum direct memory by default).

    • If yes, go to 4.
    • If no, go to 6.

  4. On FusionInsight Manager, choose Cluster > Services > Guardian. On the page that is displayed, click the Instance tab. On this tab page, choose TokenServer > Instance Configuration. Click All Configurations, and choose TokenServer > System. Set -XX:MaxDirectMemorySize in the GC_OPTS parameter to a larger value based on site requirements and save the configuration.

    If this alarm is generated, the direct memory configured for TokenServer cannot meet the direct memory required by the TokenServer process. You are advised to check the direct memory usage of TokenServer and change the value of -XX:MaxDirectMemorySize in GC_OPTS to the twice of the direct memory used by TokenServer. You can change the value based on the actual service scenario. Refer to 2 to view the TokenServer direct memory usage.

  5. Restart the affected services or instances 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, and select Guardian for the destination cluster.
  3. 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.
  4. Contact O&M personnel and provide the collected logs.

Alarm Clearance

This alarm is automatically cleared after the fault is rectified.

Related Information

None