spacewander commented on issue #4649:
URL: https://github.com/apache/apisix/issues/4649#issuecomment-884626291
I try to reproduce with:
```
upstreams:
-
id: 1
name: "nginx"
nodes:
"127.0.0.1:8080": 1 # unreachable
"127.0.0.1:1980": 1
type: roundrobin
checks:
active:
http_path: "/get"
healthy:
interval: 2
successes: 1
routes:
-
uri: /*
upstream_id: 1
#END
```
Only the first few requests hit port 8080. After `8080` is marked as
unhealthy, like:
```
2021/07/22 11:02:22 [warn] 5473#5473: *645 [lua] healthcheck.lua:1107:
log(): [healthcheck] (upstream#/upstreams/1) unhealthy TCP increment (2/2) for
'(127.0.0.1:8080)', context: ngx.timer, client: 127.0.0.1, server: 0.0.0.0:9080
```
every request hit port 1980 only.
Here is my result:
```
incubator-apisix (63f779ae*) 0
￥ curl http://127.0.0.1:9080/get
OK%
incubator-apisix (63f779ae*) 0
￥ curl http://127.0.0.1:9080/get
<html>
<head><title>502 Bad Gateway</title></head>
<body>
<center><h1>502 Bad Gateway</h1></center>
<hr><center>openresty</center>
</body>
</html>
incubator-apisix (63f779ae*) 0
￥ curl http://127.0.0.1:9080/get
OK%
incubator-apisix (63f779ae*) 0
￥ curl http://127.0.0.1:9080/get
OK%
incubator-apisix (63f779ae*) 0
￥ curl http://127.0.0.1:9080/get
OK%
incubator-apisix (63f779ae*) 0
￥ curl http://127.0.0.1:9080/get
OK%
incubator-apisix (63f779ae*) 0
￥ wrk http://127.0.0.1:9080/get
Running 10s test @ http://127.0.0.1:9080/get
2 threads and 10 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 10.05ms 2.32ms 33.74ms 88.89%
Req/Sec 501.77 46.83 600.00 72.00%
9996 requests in 10.01s, 1.54MB read
Requests/sec: 998.87
Transfer/sec: 157.98KB
```
You can check the error log and decrease the log level or add more logs to
see what happened indeed.
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