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  6. ALM-26054 Heap Memory Usage of Storm Nimbus Exceeds the Threshold

ALM-26054 Heap Memory Usage of Storm Nimbus Exceeds the Threshold

Description

The system checks the heap memory usage of Storm Nimbus every 30 seconds and compares it with the threshold. This alarm is generated if the heap memory usage exceeds the threshold (80% by default).

To modify the threshold, users can choose System > Threshold Configuration > Service > Storm on MRS Manager.

This alarm is cleared if the heap memory usage is lower than or equal to the threshold.

Attribute

Alarm ID

Alarm Severity

Automatically Cleared

26054

Major

Yes

Parameters

Parameter

Description

ServiceName

Specifies the service for which the alarm is generated.

RoleName

Specifies the role for which the alarm is generated.

HostName

Specifies the host for which the alarm is generated.

Trigger Condition

Generates an alarm when the actual indicator value exceeds the specified threshold.

Impact on the System

Frequent memory garbage collection or memory overflow may occur, affecting submission of Storm services.

Possible Causes

The heap memory usage is high or the heap memory is improperly allocated.

Procedure

  1. Check the heap memory usage.

    1. On MRS Manager, choose Alarm > ALM-26054 Heap Memory Usage of Storm Nimbus Exceeds the Threshold > Location. Query the HostName of the alarmed instance.
    2. On MRS Manager, choose Service > Storm > Instance> Nimbus (corresponding to the HostName of the alarmed instance) > Customize > Heap Memory Usage of Nimbus.
    3. Check whether the heap memory usage of Nimbus has reached the threshold (80%).
      • If yes, go to 1.d.
      • If no, go to 2.a.
    4. Adjust the heap memory.

      On MRS Manager, choose Service > Storm > Service Configuration > All > Nimbus > System. Increase the value of -Xmx in NIMBUS_GC_OPTS. Click Save Configuration. Select Restart the affected services or instances and click OK.

    5. Check whether the alarm is cleared.
      • If yes, no further action is required.
      • If no, go to 2.a.

  2. Collect fault information.

    1. On MRS Manager, choose System > Export Log.
    2. Contact technical support engineers for help, detail see technical support.

Related Information

N/A