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Help Center/ MapReduce Service/ User Guide/ MRS Cluster O&M/ MRS Cluster Alarm Handling Reference/ ALM-38005 GC Duration of the Broker Process Exceeds the Threshold

ALM-38005 GC Duration of the Broker Process Exceeds the Threshold

Updated on 2024-09-23 GMT+08:00

Description

The system checks the garbage collection (GC) duration of the Broker process every 60 seconds. This alarm is generated when the GC duration exceeds the threshold (12 seconds by default) for 3 consecutive times.

When the Trigger Count is 1, this alarm is cleared when the GC duration is less than or equal to the threshold. When the Trigger Count is greater than 1, this alarm is cleared when the GC duration is less than or equal to 90% of the threshold.

Attribute

Alarm ID

Alarm Severity

Automatically Cleared

38005

Major

Yes

Parameters

Name

Meaning

Source

Specifies the cluster for which the alarm is generated.

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

Specifies the threshold triggering the alarm. If the current indicator value exceeds this threshold, the alarm is generated.

Impact on the System

A long GC duration of the Broker process may interrupt the services.

Possible Causes

The Kafka GC duration of the node is too long or the heap memory is inappropriately allocated. As a result, GCs occur frequently.

Procedure

Check the GC duration.

  1. On the FusionInsight Manager portal, choose O&M > Alarm > Alarms > GC Duration of the Broker Process Exceeds the Threshold > Location. Check the host name of the instance involved in this alarm.
  2. On the FusionInsight Manager portal, choose Cluster > Name of the desired cluster > Services > Kafka > Instance. Click the instance for which the alarm is generated to go to the page for the instance. Click the drop-down list in the upper right corner of the chart area, choose Customize > Process > Broker GC Duration per Minute, and click OK.

    Figure 1 Broker GC Duration per Minute

  3. Check whether the GC duration of the Broker process collected every minute exceeds the threshold (12 seconds by default).

    • If yes, go to 4.
    • If no, go to 7.

Check the direct memory size configured for the Kafka.

  1. On the FusionInsight Manager portal, choose Cluster > Name of the desired cluster > Services > Kafka > Configurations > All Configurations > Broker(Role) > Environment to increase the value of -Xmx configured in the KAFKA_HEAP_OPTS parameter by referring to the Note.

    NOTE:
    • It is recommended that -Xmx and -Xms be set to the same value.
    • You are advised to set the value of KAFKA_HEAP_OPTS to twice the value of Direct Memory Used by Kafka.

      On the FusionInsight Manager portal, choose Cluster > Name of the desired cluster > Services > Kafka > Instance. Click the instance for which the alarm is generated to go to the page for the instance. Click the drop-down list in the upper right corner of the chart area and choose Customize > Process > Kafka Direct Memory Resource Status to check the value of Direct Memory Used by Kafka.

  2. Save the configuration and restart the Kafka service.

    NOTE:

    If rolling restart is performed and the current Topic has multiple copies, services are not affected. Otherwise, the Kafka service will be unavailable during the restart, and upper-layer services that depend on the Kafka service will be affected.

  3. Check whether the alarm is cleared.

    • If yes, no further action is required.
    • If no, go to 7.

Collect fault information.

  1. On the FusionInsight Manager portal, choose O&M > Log > Download.
  2. Select Kafka in the required cluster from the Service drop-down list.
  3. 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.
  4. 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

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