Queue was blocked by incompleted tasks and disappeared workers

[heroygt]

Bug Description

This kind of tasks block queue, I don't know where are they come from or how to reproduce. However, It was happened after 2 of 3 workers disappear. So I suspect they were working on the disappear workers and will never complete. But I don't know why the queue can be blocked by them.

To Reproduce

I have no idea

Expected behavior

I set timeout, it won't work. I expected queue will not be block by any incompleted tasks.

Operating System

Unbuntu 22.04

n8n Version

1.72.2

Node.js Version

20.15.0

Database

PostgreSQL

Execution mode

queue

[Joffcom]

Hey @heroygt,

We have created an internal ticket to look into this which we will be tracking as "N8N-8008"

[MarcL]

Hey @heroygt,

Have you had this happen again?
We're unsure how to reproduce this issue.

Thanks.

[heroygt]

Hey @heroygt,

Have you had this happen again? We're unsure how to reproduce this issue.

Thanks.

Better now, after I increased the N8N_CONCURRENCY_PRODUCTION_LIMIT upto 200 instead of 20. But the executions still show "Queued" some times, I haven't figured out the bottleneck.