ALM-12028 Number of Processes in the D State and Z State on a Host Exceeds the Threshold

Updated on 2024-09-23 GMT+08:00

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Alarm Description

The system checks the number of processes in the D state and Z state of user omm on the host every 30 seconds and compares the actual number with the threshold. The number of processes in the D state and Z state on the host has a default threshold range. This alarm is generated when the number of processes exceeds the threshold.

This alarm is cleared when Trigger Count is 1 and the total number of processes in the D state and Z state of user omm on the host does not exceed the threshold. This alarm is cleared when Trigger Count is greater than 1 and the total number of processes in the D state and Z state of user omm on the host is less than or equal to 90% of the threshold.

NOTE:

The function of checking the number of processes in the Z state on the host applies to MRS 3.2.0 or later.

Alarm Attributes

Alarm ID	Alarm Severity	Auto Cleared
12028	Major	Yes

Alarm Parameters

Parameter	Description
Source	Specifies the cluster or system 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.
Trigger Condition	Specifies the threshold for triggering the alarm.

Impact on the System

Latency: New service processes cannot be created. Concurrent task processing may be slow and services may be delayed.
Service failure: New service processes cannot be created, which may cause job failures.

Possible Causes

The host responds slowly to I/O (disk I/O and network I/O) requests and some processes are in the D state and Z state.

Handling Procedure

Check the processes in the D state and Z state.

In the alarm list on FusionInsight Manager, locate the row that contains the alarm, and click to view the IP address of the host for which the alarm is generated.
Log in to the host for which the alarm is generated as user root. () Then run the su - omm command to switch to user omm.
Run the following command as user omm to view the PID of the process that is in the D state and Z state:

ps -elf | grep -v "\[thread_checkio\]" | awk 'NR!=1 {print $2, $3, $4}' | grep omm | awk -F' ' '{print $1, $3}' | grep -E "Z|D" | awk '{print $2}'
Check whether the command output is empty.
- If yes, the service process is running properly. Then go to 6.
- If no, go to 5.
Switch to user root and run the reboot command to restart the host for which the alarm is generated. (Restarting a host is risky. Ensure that the service process is normal after the restart.)
Check whether the alarm is cleared 5 minutes later.
- If yes, no further action is required.
- If no, go to 7.

Collect the fault information.

On FusionInsight Manager, choose O&M. In the navigation pane on the left, choose Log > Download.
Select OMS for Service and click OK.
Click 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.
Contact O&M personnel and provide the collected logs.