Help Center/ MapReduce Service/ User Guide/ MRS Cluster O&M/ MRS Cluster Alarm Handling Reference/ ALM-23007 Garbage Collection (GC) Time of the Loader Process Exceeds the Threshold
Updated on 2024-09-23 GMT+08:00
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ALM-23007 Garbage Collection (GC) Time of the Loader Process Exceeds the Threshold

Description

The system checks GC time of the Loader process every 60 seconds. The alarm is generated when GC time of the Loader process exceeds the threshold (default value: 12 seconds) for 5 consecutive times. The alarm is cleared when GC time is less than the threshold.

Attribute

Alarm ID

Alarm Severity

Automatically Cleared

23007

Major

Yes

Parameters

Name

Meaning

Source

Specifies the cluster for which the alarm is generated.

ServiceName

Specifies the service for which the alarm is generated.

RoleName

Specifies the role for which the alarm is generated.

HostName

Specifies the host for which the alarm is generated.

Trigger Condition

Specifies the threshold triggering the alarm. If the current indicator value exceeds this threshold, the alarm is generated.

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 instance is overused or the heap memory is inappropriately allocated.

Procedure

Check GC time.

  1. On the FusionInsight Manager portal, choose O&M > Alarm > Alarms > Garbage Collection (GC) Time of the Loader Process Exceeds the Threshold > Location. Check the host name of the instance involved in this alarm.
  2. On the FusionInsight Manager portal, choose Cluster > Name of the desired cluster > Services > Loader > Instance. Click the instance for which the alarm is generated to go to the page for the instance. Click the drop-down menu in the chart area and choose Customize > GC > Garbage Collection (GC) Time of Loader. Click OK.

    Figure 1 Garbage Collection (GC) Time of Loader

  3. Check whether GC time of the Loader process every second exceeds the threshold (default value: 12 seconds).

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

  4. On the FusionInsight Manager portal, choose Cluster > Name of the desired cluster > Services > Loader > Configurations. Click All Configurations. Search LOADER_GC_OPTS in the search box. Increase the value of -Xmx as required, and click Save. Click OK.

    If this alarm is generated, the heap memory configured for the current Loader instance cannot meet the heap memory required for data transmission. You are advised to handle the problem by referring to 4 in section 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.

      During service or instance restart, Loader cannot provide services to external systems. New jobs cannot be submitted, but jobs being executed are not affected.

Collect fault information.

  1. On the FusionInsight Manager portal, choose O&M > Log > Download.
  2. Select Loader in the required cluster from the Service drop-down list.
  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 the O&M personnel and send the collected fault logs.

Alarm Clearing

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

Related Information

None