Help Center > > User Guide> MRS Manager Operation Guide (Applicable to 2.x and Earlier Versions)> Alarm Reference (Applicable to Versions Earlier Than MRS 3.x)> ALM-38000 Kafka Service Unavailable

ALM-38000 Kafka Service Unavailable

Updated at: Aug 17, 2021 GMT+08:00


The system checks the Kafka service availability every 30 seconds. This alarm is generated if the Kafka service becomes unavailable.

This alarm is cleared after the Kafka service recovers.


Alarm ID

Alarm Severity

Auto Clear








Specifies the service for which the alarm is generated.


Specifies the role for which the alarm is generated.


Specifies the host for which the alarm is generated.

Impact on the System

The cluster cannot provide the Kafka service and users cannot run new Kafka tasks.

Possible Causes

  • The KrbServer component is faulty.
  • The ZooKeeper component is faulty or fails to respond.
  • The Broker node in the Kafka cluster is abnormal.


  1. Check the KrbServer component status. For clusters without Kerberos authentication, skip this step and go to 2.

    1. Go to the MRS cluster details page and click Components.
    2. Check whether the health status of the KrbServer service is Good.
      • If yes, go to 2.a.
      • If no, go to 1.c.
    3. Rectify the fault by following instructions in ALM-25500 KrbServer Service Unavailable.
    4. Perform 1.b again.

  2. Check the ZooKeeper component status.

    1. Check whether the health status of the ZooKeeper service is Good.
      • If yes, go to 3.a.
      • If no, go to 2.b.
    2. If the ZooKeeper service is stopped, start it. For other problems, follow the instructions in ALM-13000 ZooKeeper Service Unavailable.
    3. Perform 2.a again.

  3. Check the Broker status.

    1. Choose Components > Kafka > Broker.
    2. In Role, check whether all instances are normal.
      • If yes, go to 3.d.
      • If no, go to 3.c.
    3. Select all instances of Broker and choose More > Restart Instance.
      • If the restart is successful, go to 3.d.
      • If the restart fails, go to 4.
    4. Choose Components > Kafka. Check whether the health status of Kafka is Good.
      • If yes, go to 3.e.
      • If no, go to 4.
    5. Wait 30 seconds and check whether the alarm is cleared.
      • If yes, no further action is required.
      • If no, go to 4.

  4. Collect fault information.

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

Related Information


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