ALM-43006 Heap Memory Usage of the JobHistory2x Process Exceeds the Threshold

Description

The system checks the JobHistory2x Process status every 30 seconds. The alarm is generated when the heap memory usage of a JobHistory2x Process exceeds the threshold (95% of the maximum memory).

In MRS 3.3.0-LTS and later versions, the Spark2x component is renamed Spark, and the role names in the component are also changed. For example, JobHistory2x is changed to JobHistory. Refer to the descriptions and operations related to the component name and role names in the document based on your MRS version.

Attribute

Parameters

Impact on the System

If the direct memory usage of the JobHistory2x process is too high, the performance deteriorates, and the process even becomes unavailable due to memory overflow. When it is unavailable, execution records of Spark tasks cannot be queried.

Possible Causes

The heap memory of the JobHistory2x Process is overused or the heap memory is inappropriately allocated.

Procedure

Check heap memory usage.

1. On the FusionInsight Manager portal, choose O&M > Alarm > Alarms and select the alarm whose ID is 43006. Check the RoleName in Location and confirm the IP address of HostName.
2. On the FusionInsight Manager portal, choose Cluster > Services > Spark2x > Instance and click the JobHistory2x for which the alarm is generated to go to the Dashboard page. Click the drop-down menu in the Chart area and choose Customize > Memory > JobHistory2x Memory Usage Statistics from the drop-down list box in the upper right corner and click OK. Check whether the used heap memory of the JobHistory2x Process reaches the threshold(default value is 95%) of the maximum heap memory specified for JobHistory2x.
   • If yes, go to 3.
   • If no, go to 7.
   Figure 1 JobHistory2x Memory Usage Statistics
   

3. On the FusionInsight Manager home page, choose Cluster > Services > Spark2x > Instance. Click JobHistory2x by which the alarm is reported to go to the Dashboard page, click the drop-down list in the upper right corner of the chart area, choose Customize > Memory > Statistics for the heap memory of the JobHistory2x Process, and click OK. Based on the alarm generation time, check the values of the used heap memory of the JobHistory2x process in the corresponding period and obtain the maximum value.
   Figure 2 Statistics for the heap memory of the JobHistory2x Process
   

4. On the FusionInsight Manager portal, choose Cluster > Services > Spark2x > Configurations, and click All Configurations. Choose JobHistory2x > Default. The default value of SPARK_DAEMON_MEMORY is 4GB. You can change the value according to the following rules: Ratio of the maximum heap memory usage of the JobHistory2x to the Threshold of the JobHistory2x Heap Memory Usage Statistics (JobHistory2x) in the alarm period. If this alarm is generated occasionally after the parameter value is adjusted, increase the value by 0.5 times. If the alarm is frequently reported after the parameter value is adjusted, increase the value by 1 time.
   

   On the FusionInsight Manager home page, choose O&M > Alarm > Thresholds > Spark2x > Memory >JobHistory2x Heap Memory Usage Statistics (JobHistory2x) to view Threshold.

5. Restart all JobHistory2x instances.
   

   When the instance is rebooted, it cannot be used and any tasks running on the current instance node will fail.

6. After 10 minutes, check whether the alarm is cleared.
   • If yes, no further action is required.
   • If no, go to 7.

Collect fault information.

7. On the FusionInsight Manager portal, choose O&M > Log > Download.
8. Select Spark2x in the required cluster from the Service.
9. 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.
10. Contact the O&M personnel and send the collected logs.

Alarm Clearing

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

Related Information

None