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tzssangglass avatar tzssangglass commented on September 14, 2024

I think you can learn form:

lua-resty-core/t/balancer.t

Lines 179 to 230 in 99603e5

=== TEST 5: get last peer failure status (404)
--- skip_nginx: 4: < 1.7.5
--- http_config
lua_package_path "$TEST_NGINX_LUA_PACKAGE_PATH";
proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504 http_403 http_404;
proxy_next_upstream_tries 10;
upstream backend {
server 0.0.0.1;
balancer_by_lua_block {
local b = require "ngx.balancer"
local state, status = b.get_last_failure()
print("last peer failure: ", state, " ", status)
if not ngx.ctx.tries then
ngx.ctx.tries = 0
end
if ngx.ctx.tries < 2 then
local ok, err = b.set_more_tries(1)
if not ok then
return error("failed to set more tries: ", err)
elseif err then
ngx.log(ngx.WARN, "set more tries: ", err)
end
end
ngx.ctx.tries = ngx.ctx.tries + 1
assert(b.set_current_peer("127.0.0.1", tonumber(ngx.var.server_port)))
}
}
--- config
location = /t {
proxy_pass http://backend/back;
}
location = /back {
return 404;
}
--- request
GET /t
--- response_body_like: 404 Not Found
--- error_code: 404
--- grep_error_log eval: qr{last peer failure: \S+ \S+}
--- grep_error_log_out
last peer failure: nil nil
last peer failure: next 404
last peer failure: next 404
--- no_error_log
[warn]

  1. use the get_last_failure to get 404
  2. use set_more_tries to set more retry

just an idea.

from lua-resty-core.

yuqiquan avatar yuqiquan commented on September 14, 2024

ngx.balancer的重试机制好像只有在机器故障，或者是超时的时候才进行重试

如果机器是正常的，只是返回的状态码异常，是不会触发重试机制的，这个时候 local state, status = b.get_last_failure() 返回的结果是nil，nil

最关键的是如何触发这个重试机制

from lua-resty-core.

tzssangglass avatar tzssangglass commented on September 14, 2024

最关键的是如何触发这个重试机制

proxy_next_upstream

from lua-resty-core.

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