ALM-19008 Heap Memory Usage of the HBase Process Exceeds the Threshold

Alarm Description

The system checks the HBase service status every 30 seconds. The alarm is generated when the heap memory usage of an HBase service exceeds the threshold (90% of the maximum memory).

Alarm Attributes

Alarm Parameters

Impact on the System

The available HBase memory is insufficient, which may cause node restart. During the node restart, the read/write request delay on the node increases or fails.

Possible Causes

The heap memory of the HBase service is overused or the heap memory is inappropriately allocated.

Handling Procedure

Check heap memory usage.

1. On the FusionInsight Manager portal, click O&M > Alarm > Alarms and select the alarm whose ID is 19008. Then check the role name in Location and confirm the IP adress of the instance.
   • If the role for which the alarm is generated is HMaster, go to 2.
   • If the role for which the alarm is generated is RegionServer, go to 3.

2. On the FusionInsight Manager portal, choose Cluster > Name of the desired cluster > Services > HBase > Instance and click the HMaster for which the alarm is generated to go to the Dashboard page. Click the drop-down menu in the Chart area and choose Customize > CPU and Memory > HMaster Heap Memory Usage and Direct Memory Usage Statistics and click OK, check whether the used heap memory of the HBase service reaches 90% of the maximum heap memory specified for HBase.
   • If yes, go to 4.
   • If no, go to 6.

3. On the FusionInsight Manager portal, choose Cluster > Name of the desired cluster > Services > HBase > Instance and click the RegionServer for which the alarm is generated to go to the Dashboard page. Click the drop-down menu in the Chart area and choose Customize > CPU and Memory > RegionServer Heap Memory Usage and Direct Memory Usage Statistics and click OK, check whether the used heap memory of the HBase service reaches 90% of the maximum heap memory specified for HBase.
   • If yes, go to 4.
   • If no, go to 6.

4. On the FusionInsight Manager portal, choose Cluster > Name of the desired cluster > Services > HBase > Configurations, and click All Configurations. Choose HMaster/RegionServer > System. Increase the value of -Xmx in GC_OPTS by referring to the Note.
   

   1. Suggestions on GC parameter configurations for HMaster
      • Set -Xms and -Xmx to the same value to prevent JVM from dynamically adjusting the heap memory size and affecting performance.
      • Set -XX:NewSize to the value of -XX:MaxNewSize, which is one eighth of -Xmx.
      • For large-scale HBase clusters with a large number of regions, increase values of GC_OPTS parameters for HMaster. Specifically, set -Xmx to 4 GB if the number of regions is less than 100,000. If the number of regions is more than 100,000, set -Xmx to be greater than or equal to 6 GB. For each increased 35,000 regions, increase the value of -Xmx by 2 GB. The maximum value of -Xmx is 32 GB.
   2. Suggestions on GC parameter configurations for RegionServer
      • Set -Xms and -Xmx to the same value to prevent JVM from dynamically adjusting the heap memory size and affecting performance.
      • Set -XX:NewSize to the value of -XX:MaxNewSize, which is one eighth of -Xmx.
      • Set the memory for RegionServer to be greater than that for HMaster. If sufficient memory is available, increase the heap memory.
      • Set -Xmx based on the machine memory size. Specifically, set -Xmx to 32 GB if the machine memory is greater than 200 GB, to 16 GB if the machine memory is greater than 128 GB and less than 200 GB, and to 8 GB if the machine memory is less than 128 GB. When -Xmx is set to 32 GB, a RegionServer node supports 2000 regions and 200 hotspot regions.

5. Check whether the alarm is cleared.
   • If yes, no further action is required.
   • If no, go to 6.

Collect fault information.

6. On the FusionInsight Manager portal, choose O&M > Log > Download.
7. Select HBase in the required cluster from the Service drop-down list.
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 the O&M engineers and send the collected fault logs.

Alarm Clearance

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

Related Information

None.