ALM-12203 Process Full GC Duration Exceeds the Threshold

Alarm Description

The system checks the GC duration of main OMS processes every 30 seconds. If the GC duration of an OMS process exceeds the threshold for three consecutive times, this alarm is generated. You can choose O&M > Alarm > Thresholds > OMS > OMSServices to change the threshold.

This alarm is cleared when the GC duration of the OMS process is shorter than or equal to the threshold.

Alarm Attributes

Alarm ID	Alarm Severity	Alarm Type	Service Type	Auto Cleared
12203	Major	Quality of service	Hive	Yes

Alarm Parameters

Type	Parameter	Description
Location Information	Source	Specifies the cluster for which the alarm was generated.
	ServiceName	Specifies the service for which the alarm was generated.
	RoleName	Specifies the role for which the alarm was generated.
	HostName	Specifies the host for which the alarm was generated.
Additional Information	Trigger condition	Specifies the alarm triggering condition.

Impact on the System

Read and write performance deteriorates. As a result, the task execution may slow down and even the service may restart unexpectedly.

Possible Causes

The memory of main OMS processes is too high or inappropriately allocated, causing frequent occurrence of the full GC.

Handling Procedure

Check the GC duration.

On FusionInsight Manager, choose O&M > Alarm > Alarms. In the alarm list, expand the alarm details, record the process name in Location, click the reported host name, and record the service IP address of the host.
Choose System > OMS, view the Full GC Times of OMS Process chart, and check whether the GC time is longer than 12 seconds (default value).
If no chart is available, click the drop-down arrow on the right, select Customize, select the desired item, and click OK.
- If yes, go to 3.
- If no, go to 6.

Contact O&M engineers to modify the memory configurations of the processes.
Restart the process.
Check whether the alarm is cleared.
- If yes, no further action is required.
- If no, go to 6.

Collect fault information.

On FusionInsight Manager, choose O&M. In the navigation pane on the left, choose Log > Download.
Expand the Service drop-down list, and select OmmServer for the target cluster.
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.
Contact O&M engineers and provide the collected logs.