ALM-24009 Flume Server Garbage Collection (GC) Duration Exceeds the Threshold

Alarm Description

The system checks the GC duration of the Flume process every 60 seconds. This alarm is generated when the GC duration of the Flume 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

Flume data transmission efficiency decreases.

Possible Causes

The heap memory of the Flume 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 Flume Server GC Duration 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 Garbage Collection (GC) Duration of Flume. Then, click OK.
3. Check whether the GC duration of the Flume 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 > 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 instance 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.

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 Flume 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.