Help Center> MapReduce Service> User Guide (ME-Abu Dhabi Region)> MRS Manager Operation Guide (Applicable to 2.x and Earlier Versions)> Alarm Reference (Applicable to Versions Earlier Than MRS 3.x)> ALM-13002 ZooKeeper Memory Usage Exceeds the Threshold
Updated on 2022-12-08 GMT+08:00
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ALM-13002 ZooKeeper Memory Usage Exceeds the Threshold

Description

The system checks the ZooKeeper service status every 30 seconds. The alarm is generated when the memory usage of a ZooKeeper instance exceeds the threshold (80% of the maximum memory).

The alarm is cleared when the memory usage is less than the threshold.

Attribute

Alarm ID

Alarm Severity

Auto Clear

13002

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

If the available ZooKeeper memory is insufficient, a memory overflow occurs and the service breaks down.

Possible Causes

The memory usage of the ZooKeeper instance is overused or the memory is inappropriately allocated.

Procedure

  1. Check the memory usage.

    1. On the MRS cluster details page, choose Alarms > ALM-13002 ZooKeeper Memory Usage Exceeds the Threshold > Location. Check the IP address of the instance for which the alarm is generated.
    2. On the MRS cluster details page, choose Components > ZooKeeper > Instances > quorumpeer (IP address of the instance for which the alarm is generated) > Customize > ZooKeeper Heap And Direct Buffer Resource. Check the heap memory usage.
    3. Check whether the used heap memory of ZooKeeper reaches 80% of the maximum heap memory specified for ZooKeeper.
      • If yes, go to 1.d.
      • If no, go to 1.f.
    4. On MRS Manager, choose Services > ZooKeeper > Configuration > All > quorumpeer > System. Increase the value of -Xmx in GC_OPTS as required.
    5. Check whether the alarm is cleared.
      • If yes, no further action is required.
      • If no, go to 1.f.
    6. On the MRS cluster details page, choose Components > ZooKeeper > Instances > quorumpeer (IP address of the instance for which the alarm is generated) > Customize > ZooKeeper Heap And Direct Buffer Resource. Check the direct buffer memory usage.
    7. Check whether the used direct buffer memory of ZooKeeper reaches 80% of the maximum direct buffer memory specified for ZooKeeper.
      • If yes, go to 1.h.
      • If no, go to 2.
    8. On the MRS cluster details page, choose Components > ZooKeeper > Service Configuration. Set Type to All and choose quorumpeer > System.

      Increase the value of -XX:MaxDirectMemorySize in GC_OPTS as required.

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

  2. Collect fault information.

    1. On MRS Manager, choose System > Export Log.
    2. Contact the O&M personnel and send the collected logs.

Reference

None