haifeng9414 opened a new issue #2369:
URL: https://github.com/apache/apisix/issues/2369
### Issue description
I use consul as the registry center and configuration center of apisix and I
implemented a consul service discovery through consul-template. After an
application is redeployed, the log shows that the consul service discovery has
obtained the latest application IP list, but accessing the application through
apisix returns 502, the log shows that apisix uses the old application IP.
I think it is caused by the cache of server_picker:
```
-- apisix/balancer.lua
local server_picker = lrucache_server_picker(key, version,
create_server_picker, up_conf, checker)
```
When the upstream checker is not enabled, the value of version is equal to
`route.modifiedIndex .. "&" .. service.modifiedIndex`, the change of the
application ip address in the registry center will not cause this value to
change, this will cause the application to be inaccessible until the
server_picker cache is invalidated.
I use consul as service discovery instead of eureka, but I believe that
using eureka will also have this problem. I think the version should be
obtained when obtaining the service ip address:
```
-- apisix/balancer.lua
if up_conf.service_name then
if not discovery then
return nil, "discovery is uninitialized"
end
up_conf.nodes = discovery.nodes(up_conf.service_name)
end
```
change to:
```
if up_conf.service_name then
if not discovery then
return nil, "discovery is uninitialized"
end
up_conf.nodes, up_version = discovery.nodes(up_conf.service_name)
end
```
### Environment
* apisix version (cmd: `apisix version`): lastest
master(251625d8ab969b0b46d12041beff44f329e95321)
* OS: mac os/linux
### Minimal test code / Steps to reproduce the issue
1. Set `discovery: eureka` and `worker_processes: 1`, config eureka address
in config.yaml.
2. Deploy a multi-instance application and registry to eureka.
3. Confirm that the application can be accessed through apisix.
4. Redeploy the application and access it through apisix again.
### What's the actual result? (including assertion message & call stack if
applicable)
access application through apisix returns 502
### What's the expected result?
no error
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