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Message #87514
[Bug 1948676] Re: rpc response timeout for agent report_state is not possible
Did you investigate "This has the side effect that if a rabbitmq or
neutron-server is restarted all agents that is currently reporting there
will hang for a long time until report_state times out"? Is it expected
behavior from messaging side?
** Changed in: neutron
Status: In Progress => Opinion
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https://bugs.launchpad.net/bugs/1948676
Title:
rpc response timeout for agent report_state is not possible
Status in neutron:
Opinion
Bug description:
When hosting a large amount of routers and/or networks the RPC calls
from the agents can take a long time which requires us to increase the
rpc_response_timeout from the default of 60 seconds to a higher value
for the agents to not timeout.
This has the side effect that if a rabbitmq or neutron-server is
restarted all agents that is currently reporting there will hang for a
long time until report_state times out, during this time neutron-
server has not got any reports causing it to set the agent as down.
When it times out and tries again the reporting will succeed but a
full sync will be triggered for all agents that was previously dead.
This in itself can cause a very high load on the control plane.
Consider the fact that a configuration change is deployed using
tooling to all neutron-server nodes which is restarted, all agents
will die, when they either 1) come back after rpc_response_timeout is
reached and tries again or 2) is restarted manually all of them will
do a full sync.
We should have a configuration option that only applies to the rpc
timeout for the report_state RPC call from agents because that could
be lowered to be within the bounds of the agent not being seen as
down.
The old behavior can be kept by simply falling back to
rpc_response_timeout by default instead of introducing a new default
in this override.
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References