High envoy CPU when multiple ingress per group #10826
Labels
stage/accepted
Confirmed, and intend to work on. No timeline committment though.
theme/consul/connect
Consul Connect integration
type/bug
Nomad version
Nomad v1.1.2
Consul version
Consul v1.10.0
Operating system and Environment details
Debian Linux 10.
Mostly a dev-setup (no TLS, no ACLs), so server and client and Consul are all on the same host.
Issue
When running multiple ingress gateways in one task group, only 1 gateway behaves 'normally' when it comes to CPU usage. The other gateways seem to loop and use 100% CPU.
If I place the gateways in different task groups, everything behaves normally.
Reproduction steps
Run the job file below (from the e2e tests in this repo) and monitor CPU usage.
Expected Result
All Envoys are idle and do not use any CPU.
Actual Result
2 of the 3 Envoys use 100% CPU.
Job file (if appropriate)
https://github.com/hashicorp/nomad/blob/1b68a1d067d9682c18770eef085738a2fe51e950/e2e/connect/input/multi-ingress.nomad
Nomad logs (if appropriate)
I'm not sure what logs to check. I did not see anything out of the ordinary in the Nomad or the Envoy logs. I would have expected to see something retrying or looping or something like that, but could not find anything like that.
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