redynasc opened a new issue #3339:
URL: https://github.com/apache/apisix/issues/3339
### Issue description
all requests on the upstream return 500 When the upstream node contains an
invalid domain name, even if the node's weight is zero
### Environment
* apisix version : 1.5
* OS: Linux d1-beta-node-0004 3.10.0-693.2.2.el7.x86_64 #1 SMP Tue Sep 12
22:26:13 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
* OpenResty / Nginx version: (cmd: `nginx -V` or `openresty -V`)
* nginx version: openresty/1.17.8.2
built by gcc 4.8.5 20150623 (Red Hat 4.8.5-39) (GCC)
built with OpenSSL 1.1.1g 21 Apr 2020
TLS SNI support enabled
configure arguments: --prefix=/usr/local/openresty/nginx --with-cc-opt='-O2
-DNGX_MAX_ERROR_STR=49152 -I/usr/local/openresty/pcre/include'
--add-module=../ngx_devel_kit-0.3.1 --add-module=../echo-nginx-module-0.62
--add-module=../xss-nginx-module-0.06 --add-module=../ngx_coolkit-0.2
--add-module=../set-misc-nginx-module-0.32
--add-module=../form-input-nginx-module-0.12
--add-module=../encrypted-session-nginx-module-0.08
--add-module=../srcache-nginx-module-0.32 --add-module=../ngx_lua-0.10.17
--add-module=../ngx_lua_upstream-0.07
--add-module=../headers-more-nginx-module-0.33
--add-module=../array-var-nginx-module-0.05
--add-module=../memc-nginx-module-0.19 --add-module=../redis2-nginx-module-0.15
--add-module=../redis-nginx-module-0.3.7
--add-module=../rds-json-nginx-module-0.15
--add-module=../rds-csv-nginx-module-0.09 --add-module=../ngx_stream_lua-0.0.8
--with-ld-opt='-Wl,-rpath,/usr/local/openresty/luajit/lib
-L/usr/local/openresty/pcre/lib -Wl,-rpath,/usr/local/openresty/pcr
e/lib' --with-openssl=/tmp/openssl-1.1.1g --with-file-aio
--with-http_addition_module --with-http_auth_request_module
--with-http_dav_module --with-http_flv_module --with-http_geoip_module=dynamic
--with-http_gunzip_module --with-http_gzip_static_module
--with-http_random_index_module --with-http_realip_module
--with-http_secure_link_module --with-http_slice_module --with-http_ssl_module
--with-http_stub_status_module --with-http_sub_module --with-http_v2_module
--with-mail --with-mail_ssl_module --with-md5-asm --with-sha1-asm
--with-pcre-jit --with-stream --with-stream_ssl_module --with-threads
--with-openssl-opt=-g --with-stream --with-stream_ssl_preread_module
### Minimal test code / Steps to reproduce the issue
1.Create an upstream, like this
"nodes":{
"domain1-ok:8080":100,
"domain2-ok:8080":100,
"domain3-bad:8080":0
}
2. then then requests return 500
### What's the actual result? (including assertion message & call stack if
applicable)
In most cases, the DNS timeout of the zero node will affect the entire
upstream requests
### What's the expected result?
The request on the node which the weight is not zero return ok
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