I have a Python (3.x) webservice deployed in GCP. Everytime Cloud Run is shutting down instances, most noticeably after a big load spike, I get many logs like these Uncaught signal: 6, pid=6, tid=6, fault_addr=0. together with [CRITICAL] WORKER TIMEOUT (pid:6) They are always signal 6.
The service is using FastAPI and Gunicorn running in a Docker with this start command
CMD gunicorn -w 2 -k uvicorn.workers.UvicornWorker -b 0.0.0.0:8080 app.__main__:app
The service is deployed using Terraform with 1 gig of ram, 2 cpu's and the timeout is set to 2 minutes
resource "google_cloud_run_service" <ressource-name> {
name = <name>
location = <location>
template {
spec {
service_account_name = <sa-email>
timeout_seconds = 120
containers {
image = var.image
env {
name = "GCP_PROJECT"
value = var.project
}
env {
name = "BRANCH_NAME"
value = var.branch
}
resources {
limits = {
cpu = "2000m"
memory = "1Gi"
}
}
}
}
}
autogenerate_revision_name = true
}
I have already tried tweaking the resources and timeout in Cloud Run, using the --timeout and --preload flag for gunicorn as that is what people always seem to recommend when googling the problem but all without success. I also dont exactly know why the workers are timing out.
Unless you have enabled CPU is always allocated, background threads and processes might stop receiving CPU time after all HTTP requests return. This means background threads and processes can fail, connections can timeout, etc. I cannot think of any benefits to running background workers with Cloud Run except when setting the --cpu-no-throttling flag. Cloud Run instances that are not processing requests, can be terminated.
Signal 6 means abort which terminates processes. This probably means your container is being terminated due to a lack of requests to process.
Run more workloads on Cloud Run with new CPU allocation controls
What if my application is doing background work outside of request processing?