Help Center > > User Guide> Managing Active Clusters> Alarm Reference> ALM-14000 HDFS Service Unavailable

ALM-14000 HDFS Service Unavailable

Updated at: Dec 31, 2019 GMT+08:00

Description

The system checks the service status of NameService every 30 seconds. This alarm is generated when the HDFS service becomes unavailable because all NameService services are abnormal.

This alarm is cleared when the HDFS service recovers because at least one NameService service is in the normal state.

Attribute

Alarm ID

Alarm Severity

Automatically Cleared

14000

Critical

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.

Impact on the System

HDFS fails to provide services for HDFS service-based upper-layer components, such as HBase and MapReduce. As a result, users cannot read or write files.

Possible Causes

  • The ZooKeeper service is abnormal.
  • All NameService services are abnormal.

Procedure

  1. Check the ZooKeeper service status.

    1. Log in to MRS cluster details page, choose Components, and check whether the health status of the ZooKeeper service is Good.

      For MRS 2.0.1 or earlier, log in to MRS Manager to view Services information.

      • If yes, go to 1.b.
      • If no, go to 2.a.
    2. Rectify the health status. For details, see ALM-13000 ZooKeeper Service Unavailable. Check whether the health status of the ZooKeeper service is Good.
      • If yes, go to 1.c.
      • If no, go to 3.
    3. Wait 5 minutes and check whether the alarm is cleared.
      • If yes, no further action is required.
      • If no, go to 2.a.

  2. Handle the NameService service exception alarm.

    1. Log in to MRS cluster details page. On the Alarms page, check whether all NameService services have abnormal alarms.

      For MRS 2.0.1 or earlier, log in to MRS Manager to view alarm information.

      • If yes, go to 2.b.
      • If no, go to 3.
    2. See ALM-14010 NameService Service Is Abnormal to handle abnormal NameService services and check whether each alarm is cleared.
      • If yes, go to 2.c.
      • If no, go to 3.
    3. Wait 5 minutes and check whether the alarm is cleared.
      • If yes, no further action is required.
      • If no, go to 3.

  3. Collect fault information.

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

Related Information

N/A

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