Help Center/ MapReduce Service/ User Guide/ MRS Cluster O&M/ MRS Cluster Alarm Handling Reference/ ALM-29012 Number of Queries Being Waited by Impalad Exceeds the Threshold
Updated on 2024-09-23 GMT+08:00
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ALM-29012 Number of Queries Being Waited by Impalad Exceeds the Threshold

Alarm Description

The system checks the total number of queries being waited by the Impalad node every 60 seconds. This alarm is generated when the number of queries exceeds the customized threshold (150 by default).

This alarm is automatically cleared when the number of queries is less than the threshold.

Alarm Attributes

Alarm ID

Alarm Severity

Auto Cleared

29012

Major

Yes

Alarm Parameters

Type

Parameter

Description

Location Information

Source

Specifies the cluster for which the alarm was generated.

ServiceName

Specifies the service for which the alarm was generated.

RoleName

Specifies the role for which the alarm was generated.

HostName

Specifies the host for which the alarm was generated.

Additional Information

Trigger Condition

Specifies the threshold for triggering the alarm.

Impact on the System

The queries may be blocked or even fail.

Possible Causes

The Impalad service has maintained a large number of queries, or the threshold is too small.

Handling Procedure

  1. On FusionInsight Manager, choose O&M > Alarm > Thresholds > Impala > Query Task Sum Statistics > Total number of Waiting Queries (Impalad) and check the threshold.

  2. Change the threshold.

  3. Click the Instances tab, select all Impalad instances, and restart them.

    The service will become unavailable when all instances are restarted. If a single instance is restarted, the tasks that are being executed on that instance will fail and the service will become available.

  1. After the restart is complete, check whether the alarm is cleared.

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

Collect fault information.

  1. On FusionInsight Manager, choose O&M. In the navigation pane on the left, choose Log > Download.
  2. Expand the Service drop-down list, and select Impala for the target cluster.
  3. Click the edit icon in the upper right corner, and set Start Date and End Date for log collection to 1 hour ahead of and after the alarm generation time, respectively. Then, click Download.
  4. Contact O&M personnel and provide the collected logs.

Alarm Clearance

This alarm is automatically cleared after the fault is rectified.

Related Information

None