Hello,
I’m using some curl scripts on DataPlaneApi to add and remove servers to a haproxy backend. That works very well in all but one point. It seems I’m losing all open calls to haproxy when I change the backend. The clients gets a NoHttpResponseException (Apache Http Client for Java). That works with a single retry on the call, however it is an undesired behavior. Please note it is not the calls already processed by the server since they are maxconn 1 and I get the same error on 5 parallel clients.
Is there a better way to add/remove servers without losing open calls to other servers?
The backend is for testing pretty simple:
backend test_backend from my_defaults
mode http
server server12345 127.0.0.1:12345 check maxconn 1 weight 100
server server12346 127.0.0.1:12346 check maxconn 1 weight 100
program api
command /etc/haproxy/dataplaneapi -f /etc/haproxy/dataplaneapi.hcl
no option start-on-reload
[UPDATE]
Some further testing shows that the problem is the client connections are kept alive and cannot reestablish a connection to the new process.
Best regards
Jens
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