ALM-23007 GC Duration of the Loader Process Exceeds the Threshold

Alarm Description

The system checks the GC duration of the Loader process every 60 seconds. This alarm is generated when the GC duration of the Loader process exceeds the threshold for five consecutive times. This alarm is cleared when the GC duration is less than the threshold.

Alarm Attributes

Alarm Parameters

Impact on the System

Full GC occurs frequently, and the Loader service responds slowly. The Loader service may even break down and cannot provide services properly.

Possible Causes

The heap memory of the Loader process is overused or inappropriately allocated, causing frequent occurrence of the GC process.

Handling Procedure

Check the GC duration.

1. Log in to FusionInsight Manager and choose O&M. In the navigation pane on the left, choose Alarm > Alarms. On the page that is displayed, locate the row containing GC Duration of Loader Exceeds the Threshold, and view the Location information. Check the name of the instance host for which the alarm is generated.
2. On FusionInsight Manager, choose Cluster > Name of the target cluster > Services > Loader and click the Instance tab. On the displayed page, select the role corresponding to the host name for which the alarm is generated and select Customize from the drop-down list in the upper right corner of the chart area. Choose GC and select GC Duration of Loader. Click OK.
3. Check whether the GC duration of the Loader process collected every minute exceeds the threshold (12 seconds by default).
   • If yes, go to 4.
   • If no, go to 6.

4. On FusionInsight Manager, choose Cluster > Name of the desired cluster > Services > Loader. Click Configurations and then the All Configurations tab. On the displayed page, search for LOADER_GC_OPTS. Increase the value of -Xmx as required, click Save, and click OK.
   

   If this alarm is generated, the heap memory configured for the current Loader instance cannot meet the heap memory requirements for data transmission. You are advised to handle this alarm by referring to 4 (in ALM-23004 Loader Heap Memory Usage Exceeds the Threshold).

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.

6. On FusionInsight Manager, choose O&M. In the navigation pane on the left, choose Log > Download.
7. Expand the Service drop-down list, and select Loader for the target cluster.
8. 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.
9. Contact O&M engineers and provide the collected logs.

Alarm Clearance

This alarm is automatically cleared after the fault is rectified.

Related Information

None.