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Updated on 2022-08-12 GMT+08:00
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ALM-24006 Heap Memory Usage of Flume Server Exceeds the Threshold

Description

The system checks the heap memory usage of the Flume service every 60 seconds. This alarm is generated when the heap memory usage of the Flume instance exceeds the threshold (95% of the maximum memory) for 10 consecutive times. This alarm is cleared when the heap memory usage is less than the threshold.

Attribute

Alarm ID

Alarm Severity

Auto Clear

24006

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 for triggering the alarm.

Impact on the System

Heap memory overflow may cause service breakdown.

Possible Causes

The heap memory of the Flume instance is overused or the heap memory is inappropriately allocated.

Procedure

Check the heap 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 Flume Heap Memory Usage Exceeds the Threshold, and view the Location information. Check the name of the host for which the alarm is generated.
  2. On FusionInsight Manager, choose Cluster > Name of the target cluster > Services > Flume. On the page that is displayed, click the Instance tab. On the displayed tab 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 Agent and select Flume Heap Memory Resource Percentage. Then, click OK.
  3. Check whether the heap memory used by Flume reaches the threshold (95% of the maximum heap memory by default).

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

  4. On FusionInsight Manager, choose Cluster > Name of the desired cluster > Service > Flume > Configuration. On the page that is displayed, click All Configurations and choose Flume > System. Set -Xmx in the GC_OPTS parameter to a larger value based on site requirements and save the configuration.

    If this alarm is generated, the heap memory configured for the Flume server is insufficient for data transmission. You are advised to change the heap memory to: Channel capacity x Maximum size of a single data record x Number of channels. Note that the value of xmx cannot exceed the remaining memory of the node.

  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 the 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 Flume for the target 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 Clearing

This alarm is automatically cleared after the fault is rectified.

Related Information

None