Help Center/ MapReduce Service/ User Guide (Ankara Region)/ Alarm Reference/ ALM-18021 Mapreduce Service Unavailable
Updated on 2024-11-29 GMT+08:00
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ALM-18021 Mapreduce Service Unavailable

Alarm Description

The alarm module checks the MapReduce service status every 60 seconds. This alarm is generated when the system detects that the MapReduce service is unavailable.

The alarm is cleared when the MapReduce service recovers.

Alarm Attributes

Alarm ID

Alarm Severity

Alarm Type

Service Type

Auto Cleared

18021

Critical

Error handling

MapReduce

Yes

Alarm Parameters

Type

Parameter

Description

Location Information

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.

Impact on the System

The cluster cannot provide the MapReduce service. For example, MapReduce cannot be used to view task logs or the log archive function is unavailable.

Possible Causes

  • The JobHistoryServer instance is abnormal.
  • The KrbServer service is abnormal.
  • The ZooKeeper service abnormal.
  • The HDFS service abnormal.
  • The Yarn service is abnormal.

Handling Procedure

Check MapReduce service JobHistoryServer instance status.

  1. On the FusionInsight Manager home page, choose Cluster > Name of the desired cluster > Services > MapReduce > Instance.
  2. Check whether the running status of JobHistoryServer is Normal.

    • If yes, go to 11.
    • If no, go to 3.

Check the KrbServer service status.

  1. In the alarm list on FusionInsight Manager, check whether ALM-25500 KrbServer Service Unavailable exists.

    • If yes, go to 4.
    • If no, go to 5.

  2. Rectify the fault by following the steps provided in ALM-25500 KrbServer Service Unavailable, and check whether the alarm is cleared.

    • If yes, no further action is required.
    • If no, go to 5.

Check the ZooKeeper service.

  1. In the alarm list on FusionInsight Manager, check whether ALM-13000 ZooKeeper Service Unavailable exists.

    • If yes, go to 6.
    • If no, go to 7.

  2. Rectify the fault by following the steps provided in ALM-13000 ZooKeeper Service Unavailable, and check whether the alarm is cleared.

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

Check the HDFS service status.

  1. In the alarm list on FusionInsight Manager, check whether ALM-14000 HDFS Service Unavailable exists.

    • If yes, go to 8.
    • If no, go to 9.

  2. Rectify the fault by following the steps provided in ALM-14000 HDFS Service Unavailable, and check whether the alarm is cleared.

    • If yes, no further action is required.
    • If no, go to 9.

Check the Yarn service status.

  1. In the alarm list on FusionInsight Manager, check whether ALM-18000 Yarn Service Unavailable exists.

    • If yes, go to 10
    • If no, go to 11.

  2. Rectify the fault by following the steps provided in ALM-18000 Yarn Service Unavailable, and check whether the alarm is cleared.

    • If yes, no further action is required.
    • If no, go to 11.

Collect fault information.

  1. On the FusionInsight Manager home page of the active cluster, choose O&M > Log > Download.
  2. Select MapReduce in the required cluster from the Service.
  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 engineers and send the collected logs.

Alarm Clearance

After the fault is rectified, the system automatically clears this alarm.

Related Information

None.

Parent topic: Alarm Reference