yowenter commented on issue #7715:
URL: https://github.com/apache/apisix/issues/7715#issuecomment-1347780375
> Since you can reproduce consistently, it would be great if you could
provide minimal reproduction use cases.
It's not consistenly that we can reproduce. we used apisix helm chart
appVersion 2.15.1 , verison 0.11.3.
we can only reproduce it by accidently.
there are some facts we can ensure:
1. once we change the etcd address to ip, there will be no probelm.
2. if we add ` log.error("select random answer: ", idx, " from answers:
",json.delay_encode(answers)) ` in client.lua file, the probablity is
decreasing significantly.
```
function _M.resolve(self, domain, selector)
local client = self.client
-- this function will dereference the CNAME records
local answers, err = client.resolve(domain)
if not answers then
return nil, "failed to query the DNS server: " .. err
end
-- log.error("resolve ", domain, " answers:
",json.delay_encode(answers),". ")
if answers.errcode then
return nil, "server returned error code: " .. answers.errcode
.. ": " .. answers.errstr
end
-- log.error("resolver use selector:", selector)
if selector == _M.RETURN_ALL then
log.error("dns resolve ", domain, ", result: ",
json.delay_encode(answers))
for _, answer in ipairs(answers) do
if answer.type == client.TYPE_SRV then
return resolve_srv(client, answers)
end
end
return table.deepcopy(answers)
end
local idx = math_random(1, #answers)
local answer = answers[idx]
log.error("select random answer: ", idx, " from answers:
",json.delay_encode(answers))
local dns_type = answer.type
if dns_type == client.TYPE_A or dns_type == client.TYPE_AAAA then
-- log.error("dns resolve ", domain, ", result: ",
json.delay_encode(answer))
return table.deepcopy(answer)
end
return nil, "unsupported DNS answer"
end
```
> Or you could track `local function resolve(qname, r_opts, dnsCacheOnly,
try_list)` in `/usr/local/apisix/deps/share/lua/5.1/resty/dns/client.lua
L1069~L1240`
I may try this later.
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