scale out ( app services plan)

Question

During scale out processes(rule based scale out) we detected 2 issues

Issues 1 zombie processes detected during this timeframe

Issues 2 high load average average detected . shows load average information if system has load average > 4 times # of Cpu's in the timeframe

how we can resolve this issues ? and need brief guidance for this topics

Answer 1

@Mayank Jain Thanks for reaching out to Microsoft Q&A, apologize for any inconvenience caused on this.

Based on the shared information, I understand that your application is running on Linux based app service plan and while trying out to scale out app service plan (adding new instances) you are facing the issues.

Zombie Processes :
Zombie processes are processes that have completed execution but still have an entry in the process table. These processes can cause issues with system performance and stability.

You can identify and kill the zombie processes.

1. Navigate/SSH to kudu console.
2. Run the command ps aux | grep Z to identify the zombie processes.
3. You can kill those Zombie process either by using the Kill command kill -9 <PID> or by restarting the app service.

High Load average detected occurs if there are too many processes running inside which can lead to performance issues on app service, I would suggest you follow this performance degradation troubleshooting guide to identify the issues.

Also, just want to check is this an ongoing issue or are you looking for a root cause? If you are looking for a root cause I would suggest you raise a support ticket for deeper investigations on this.

I hope this helps! Feel free to reach back to me if you have any further questions on this.