Help Center/ MapReduce Service/ User Guide/ MRS Cluster O&M/ MRS Cluster Alarm Handling Reference/ ALM-50217 Heap Memory Usage of the FE Node Exceeds the Threshold
Updated on 2024-09-23 GMT+08:00
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ALM-50217 Heap Memory Usage of the FE Node Exceeds the Threshold

Alarm Description

The system checks the heap memory usage of the FE node every 30 seconds. This alarm is generated when the heap memory usage exceeds the threshold (95% by default).

This alarm is cleared when the heap memory usage of the FE node falls below the threshold.

Alarm Attributes

Alarm ID

Alarm Severity

Auto Cleared

50217

Critical

Yes

Alarm Parameters

Parameter

Description

Source

Specifies the cluster or system 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 for triggering the alarm.

Impact on the System

Task execution and client connection to the FE are affected.

Possible Causes

The FE heap memory is too small.

Handling Procedure

Check heap memory usage.

  1. Log in to FusionInsight Manager, choose O&M > Alarm > Thresholds, select the name of the desired cluster, and choose Doris > CPU and Memory > Heap memory usage of the FE node (FE).

    1. Click the edit button next to Trigger Count, change the number based on site requirements, and click OK.
    2. Click Modify in the Operation column, change the alarm threshold based on site requirements, and click OK.

  2. On FusionInsight Manager, choose Cluster > Services > Doris > FE > Configurations > All Configurations, search for the FE_GC_OPTS parameter, increase the value of -Xmx as required, click Save, and click OK.

    • If this alarm is generated, the heap memory configured for the current Doris instance is not enough for data transmission. You are advised to open the instance monitoring page, display the Doris heap memory resource status monitoring chart, and observe the change trend of the heap memory used by Doris in the monitoring chart. Then change the value of -Xmx to twice the current heap memory usage or to another value to meet site requirements.
    • When setting the heap memory, you can set -Xms and -Xmx to approximately the same value to prevent performance deterioration caused by heap size adjustment after each GC.
    • The sum of -Xmx and XX:MaxPermSize cannot be greater than the actual physical memory of the node server.

  3. Restart the affected services or instances and check whether the alarm is cleared.

    • If yes, no further action is required.
    • If no, go to 4.
    • During the restart of the Doris service, the Doris service is unavailable and cannot provide services for external systems. Tasks connected to the Doris service fail.
    • During instance restart, the tasks running on the nodes of the instance will fail. The tasks on instance nodes that are not restarted are not affected.

Collect fault information.

  1. On FusionInsight Manager, choose O&M. In the navigation pane on the left, choose Log > Download.
  2. Expand the Service drop-down list, and select Doris for the target cluster.
  3. 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.
  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.