Help Center/ MapReduce Service/ User Guide/ MRS Cluster O&M/ MRS Cluster Alarm Handling Reference/ ALM-16000 Percentage of Sessions Connected to the HiveServer to Maximum Number Allowed Exceeds the Threshold
Updated on 2024-09-23 GMT+08:00
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ALM-16000 Percentage of Sessions Connected to the HiveServer to Maximum Number Allowed Exceeds the Threshold

Description

The system detects the percentage of sessions connected to the HiveServer to the maximum number of allowed sessions every 30 seconds. This indicator can be viewed on the Cluster > Name of the desired cluster > Services > Hive > Instance > HiveServer instance. This alarm is generated when the percentage exceeds the default value 90%.

To change the threshold, choose O&M > Alarm > Thresholds > Name of the desired cluster > Hive > Percentage of Sessions Connected to the HiveServer to Maximum Number of Sessions Allowed by the HiveServer.

When the Trigger Count is 1, this alarm is cleared when the percentage is less than or equal to the threshold. When the Trigger Count is greater than 1, this alarm is cleared when the percentage is less than or equal to 90% of the threshold.

Attribute

Alarm ID

Alarm Severity

Automatically Cleared

16000

Minor

Yes

Parameters

Name

Meaning

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.

Trigger Condition

Specifies the threshold triggering the alarm. If the current indicator value exceeds this threshold, the alarm is generated.

Impact on the System

If a connection number alarm is generated, the number of sessions connected to HiveServer is too large. As a result, new connections cannot be established, new tasks fail, or even services restart unexpectedly.

Possible Causes

Too many clients are connected to HiveServer.

Procedure

Increase the maximum number of connections to Hive.

  1. On the FusionInsight Manager portal, Choose Cluster > Name of the desired cluster > Services > Hive > Configurations >All Configurations.
  2. Search for hive.server.session.control.maxconnections and increase the value of this parameter. If the value of this parameter is A, the threshold is B, and the number of sessions connected to the HiveServer is C, adjust the value of this parameter according to A x B > C. To view the number of sessions connected to the HiveServer, check the value of Statistics for Sessions of the HiveServer on the Hive monitoring page.
  3. Check whether the alarm is cleared.

    • If yes, no further action is required.
    • If no, go to 4.

Collect fault information.

  1. On the FusionInsight Manager portal, choose O&M > Log > Download.
  2. Select Hive 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 personnel and send the collected logs.

Alarm Clearing

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

Related Information

None