ALM-23006 Loader Direct Memory Usage Exceeds the Threshold

Alarm Description

The system checks the direct memory usage of the Loader service every 30 seconds. This alarm is generated when the direct memory usage of the Loader instance exceeds the threshold for five consecutive times. This alarm is cleared when the Loader direct memory usage is less than or equal to the threshold.

Alarm Attributes

Alarm Parameters

Impact on the System

Loader may fail to provide services for external systems. I/O or socket exceptions occur, and active/standby switchovers occur frequently.

Possible Causes

The direct memory of Loader instances 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. In the navigation pane on the left, choose Alarm > Alarms. On the page that is displayed, locate the row containing Loader Direct Memory Usage 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 Memory and select Loader Direct Memory Resource Usage Statistics. Click OK.
3. Check whether the direct memory used by Loader 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 > 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 -XX:MaxDirectMemorySize as required, click Save, and click OK.
   

   Observe the change trend of the direct memory used by Loader in the "Loader direct memory resource status" monitoring chart. Then change the value of -XX:MaxDirectMemorySize to twice the current direct memory usage or to another value to meet site requirements.

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.