wklken commented on issue #10093:
URL: https://github.com/apache/apisix/issues/10093#issuecomment-1702146347
I have reproduce @jiangfucheng
just mock dns fail in lua
## apisix config:
1. start apisix with 4 processes
2. change then nginx error log level to `info`
## register route:
1. add a route `/get` with one upstream, one node like `httpbin.org`; the
parsed data in log is
`"nodes":[{"host":"54.175.87.239","priority":1,"domain":"httpbin.org","port":80,"weight":100,"upstream_host":"httpbin.org"}]`
2. change `apisix/utils/upstream.lua` to mock dns random error, note the
`1693542089` is a `now() + 60`
```lua
local function parse_domain_for_nodes(nodes)
local new_nodes = core.table.new(#nodes, 0)
for _, node in ipairs(nodes) do
local host = node.host
if not ipmatcher.parse_ipv4(host) and
not ipmatcher.parse_ipv6(host) then
if host == "httpbin.org" and ngx_now() <= 1693542089 then
if random(1,10) % 2 == 0 then
core.log.error("101 empty records")
return new_nodes
end
-- return nil, "failed to query the DNS server: timeout11"
end
local ip, err = core.resolver.parse_domain(host)
if ip then
local new_node = core.table.clone(node)
new_node.host = ip
new_node.domain = host
core.table.insert(new_nodes, new_node)
end
```
3. `apisix reload`
## do requests
1. `wrk -c2 -t2 -d60s http://{}/get`
2. and after the wrk finished, do `curl http://{}/get` for about 10 times,
got 200 and 503
## the log
when 503, there got no `dns` logs before `no valid upstream node`
```
2023/09/01 04:24:20 [info] 140701#140701: *15533385 [lua]
radixtree_uri_with_parameter.lua:53: match(): route match mode:
radixtree_uri_with_parameter
2023/09/01 04:24:20 [info] 140701#140701: *15533385 [lua] init.lua:572:
http_access_phase(): matched route:
{"key":"/bk-gateway-apisix/routes/test.prod.2423","modifiedIndex":532500,"clean_handlers":"table:
0x7f7d645c64c8","has_domain":true,"value":{"create_time":1693309224,"methods":["GET"],"service_id":"test.prod.stage-12","update_time":1693539224,"timeout":{"send":150,"read":150,"connect":150},"labels":{"gateway.bk.tencent.com/gateway":"test","gateway.bk.tencent.com/stage":"prod"},"uris":["/api/test/prod/dns","/api/test/prod/dns/"],"status":1,"priority":0,"name":"test-prod-dns","id":"test.prod.2423","plugins":{"bk-proxy-rewrite":{"match_subpath":false,"subpath_param_name":":ext","method":"GET","use_real_request_uri_unsafe":false,"uri":"/get"},"bk-resource-context":{"bk_resource_auth":{"resource_perm_required":false,"skip_user_verification":false,"verified_app_required":false,"verified_user_required":false},"bk_resource_id":2423,"bk_resource_name":"dns","bk_resource_auth_obj":{"r
esource_perm_required":false,"skip_user_verification":false,"verified_app_required":false,"verified_user_required":false}}},"upstream":{"nodes":{},"hash_on":"vars","scheme":"http","parent":{"key":"/bk-gateway-apisix/routes/test.prod.2423","modifiedIndex":532500,"clean_handlers":{},"has_domain":true,"value":"table:
0x7f7d9706c708","update_count":0,"orig_modifiedIndex":532500,"createdIndex":532332},"type":"roundrobin","pass_host":"node","timeout":{"send":150,"read":150,"connect":150}}},"update_count":0,"orig_modifiedIndex":532500,"createdIndex":532332
2023/09/01 04:24:20 [info] 140701#140701: *15533385 [lua] plugin.lua:630:
merge_service_route(): route conf:
{"key":"/bk-gateway-apisix/routes/test.prod.2423","modifiedIndex":532500,"clean_handlers":"table:
0x7f7d645c64c8","has_domain":true,"value":{"create_time":1693309224,"methods":["GET"],"service_id":"test.prod.stage-12","update_time":1693539224,"timeout":{"send":150,"read":150,"connect":150},"labels":{"gateway.bk.tencent.com/gateway":"test","gateway.bk.tencent.com/stage":"prod"},"uris":["/api/test/prod/dns","/api/test/prod/dns/"],"status":1,"priority":0,"name":"test-prod-dns","id":"test.prod.2423","plugins":{"bk-proxy-rewrite":{"match_subpath":false,"subpath_param_name":":ext","method":"GET","use_real_request_uri_unsafe":false,"uri":"/get"},"bk-resource-context":{"bk_resource_auth":{"resource_perm_required":false,"skip_user_verification":false,"verified_app_required":false,"verified_user_required":false},"bk_resource_id":2423,"bk_resource_name":"dns","bk_resource_auth_obj":
{"resource_perm_required":false,"skip_user_verification":false,"verified_app_required":false,"verified_user_required":false}}},"upstream":{"nodes":{},"hash_on":"vars","scheme":"http","parent":{"key":"/bk-gateway-apisix/routes/test.prod.2423","modifiedIndex":532500,"clean_handlers":{},"has_domain":true,"value":"table:
0x7f7d9706c708","update_count":0,"orig_modifiedIndex":532500,"createdIndex":532332},"type":"roundrobin","pass_host":"node","timeout":{"send":150,"read":150,"connect":150}}},"update_count":0,"orig_modifiedIndex":532500,"createdIndex":532332}
2023/09/01 04:24:21 [error] 140701#140701: *15534047 [lua] init.lua:486:
handle_upstream(): failed to set upstream: no valid upstream node
```
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