Help Center/ MapReduce Service/ User Guide/ MRS Cluster O&M/ MRS Cluster Alarm Handling Reference/ ALM-12027 Host PID Usage Exceeds the Threshold
Updated on 2024-09-23 GMT+08:00
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ALM-12027 Host PID Usage Exceeds the Threshold

Description

The system checks the PID usage every 30 seconds and compares the actual PID usage with the default PID usage threshold. This alarm is generated when the system detects that the PID usage exceeds the threshold.

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

Attribute

Alarm ID

Alarm Severity

Auto Clear

12027

Major

Yes

Parameters

Name

Meaning

Source

Specifies the cluster or system 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

Service failure: If the PID usage of the host is too high, PIDs cannot be allocated to new service processes. As a result, jobs may fail to be executed.

Possible Causes

Too many processes are running on the node. You need to increase the value of pid_max.

Procedure

Increase the value of pid_max.

  1. In the alarm list on FusionInsight Manager, click in the row where the alarm is located to view the alarm host address in the alarm details.
  2. Log in to the host where the alarm is generated as user root.
  3. Run the cat /proc/sys/kernel/pid_maxcommand to check the value of pid_max.
  4. If the PID usage exceeds the threshold, edit the /etc/sysctl.conf file and increase the value of kernel.pid_max to twice of the value of pid_max queried in 3. If this parameter does not exist, add it to the end of the file.

    For example, change the parameter to kernel.pid_max=65536 and run the following command to make the parameter take effect immediately:

    sysctl -p

    The maximum value of kernel.pid_max is as follows:

    • On 32-bit systems: 32768
    • On 64-bit systems: 4194304 (2^22)

  5. Wait for 5 minutes, and check whether the alarm is cleared.

    • If yes, no further action is required.
    • If no, go to 6.

Collect fault information.

  1. On the FusionInsight Manager home page of the active cluster, choose O&M > Log > Download.
  2. Select all services from the Service and click OK.
  3. Click in the upper right corner, and set Start Date and End Date for log collection to 30 minutes ahead of and after the alarm generation time, respectively. Then, click Download.
  4. Contact the O&M personnel and send the collected log information.

Alarm Clearing

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

Related Information

None