ALM-29004 Impalad Process Memory Usage Exceeds the Threshold

Alarm Description

The system checks the memory usage of the Impalad process every 30 seconds. This alarm is generated when the system detects that the memory usage exceeds the default threshold (80%).

This alarm is automatically cleared when the system detects that the memory usage of the process falls below the threshold.

Alarm Attributes

Alarm ID	Alarm Severity	Auto Cleared
29004	Minor	Yes

Alarm Parameters

Parameter	Description
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.
Trigger Condition	Specifies the threshold for triggering the alarm.

Impact on the System

The memory usage is too high. Some query tasks may fail due to insufficient memory.

Possible Causes

The Impalad process is executing a large number of query tasks.

Handling Procedure

On FusionInsight Manager, choose O&M > Alarm > Thresholds > Impala > CPU and Memory > Impalad Process Memory Usage (Impalad) and check the threshold.
If the alarm threshold is smaller than 80%, increase the alarm threshold as required and check whether the alarm is cleared.
- If yes, no further action is required.
- If no, go to 3.
If the threshold is greater than 80%, check whether a large number of concurrent query tasks exist when the alarm is generated. A large number of concurrent query tasks will cause the memory usage to increase sharply. After the tasks are complete, check whether the alarm is automatically cleared. During this period, some tasks may fail to be executed or may be canceled due to insufficient memory. In this case, try again.

If the memory usage always exceeds the threshold, the cluster capacity needs to be expanded.
- If yes, no further action is required.
- If no, go to 4.

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 Impala for the target cluster.
Click the edit icon in the upper right corner, and set Start Date and End Date for log collection to 1 hour ahead of and after the alarm generation time, respectively. Then, click Download.
Contact O&M personnel and provide the collected logs.