Help Center > > User Guide> Managing an Existing Cluster> Alarm Reference> ALM-18000 Yarn Service Unavailable

ALM-18000 Yarn Service Unavailable

Updated at:Sep 08, 2020 GMT+08:00

Description

The alarm module checks the Yarn service status every 30 seconds. This alarm is generated when the Yarn service is unavailable and is cleared when the Yarn service recovers.

Attribute

Alarm ID

Alarm Severity

Automatically Cleared

18000

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

  • The cluster cannot provide the Yarn service.
  • Users cannot run new applications.
  • Submitted applications cannot be run.

Possible Causes

  • The ZooKeeper service is abnormal.
  • The HDFS service is abnormal.
  • There is no active ResourceManager node in the Yarn cluster.
  • All NodeManager nodes in the Yarn cluster are abnormal.

Procedure

  1. Check the ZooKeeper service status.

    1. On the MRS cluster details page, click Alarms.

      For MRS 1.8.10 or earlier, log in to MRS Manager and click Alarms.

    2. Check whether alarm ALM-13000 ZooKeeper Service Unavailable is generated.
      • If yes, go to 1.c.
      • If no, go to 2.b.
    3. 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 2.b.

  2. Check the HDFS service status.

    1. On the MRS cluster details page, click Alarms.

      For MRS 1.8.10 or earlier, log in to MRS Manager and click Alarms.

    2. Check whether an alarm related to HDFS is generated.
      • If yes, go to 2.c.
      • If no, go to 3.b.
    3. Click Alarms, and handle HDFS alarms according to Alarm Help. Check whether the alarm is cleared.
      • If yes, no further action is required.
      • If no, go to 3.b.

  3. Check the ResourceManager node status in the Yarn cluster.

    1. On the MRS cluster details page, click Components.

      For MRS 1.8.10 or earlier, log in to MRS Manager and click Services.

    2. Choose Yarn.
    3. In Yarn Summary, check whether there is an active ResourceManager node in the Yarn cluster.
      • If yes, go to 4.b.
      • If no, go to 5.

  4. Check the NodeManager node status in the Yarn cluster.

    1. On the MRS cluster details page, click Components.

      For MRS 1.8.10 or earlier, log in to MRS Manager and click Services.

    2. Choose Yarn > Instance.
    3. Check Health Status of NodeManager, and check whether there are unhealthy nodes.
      • If yes, go to 4.d.
      • If no, go to 5.
    4. Rectify the fault by following the steps provided in ALM-18002 NodeManager Heartbeat Lost or ALM-18003 NodeManager Unhealthy. After the fault is rectified, check whether the alarm is cleared.
      • If yes, no further action is required.
      • If no, go to 5.

  5. 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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