JanLi-air opened a new issue #1111: request help: apisix.plugins.limit-count.limit-count-redis performance downgraded for continuous pressure URL: https://github.com/apache/incubator-apisix/issues/1111 ### Issue description Performance downgraded dramatically when pressure limit-count-redis continuously. The qps is 6000+ and 90% latency is 30+ for 10000 requests.  But it downgraded to 500+ and 400+ for 100000 requests.  For 100000 requests you can see error logs like this: 2020/02/07 15:14:59 [crit] 32437#0: *149168 connect() to 10.112.16.139:6379 failed (99: Cannot assign requested address), client: 127.0.0.1, server: , request: "GET /index.html?jwt=... HTTP/1.0", host: "127.0.0.1:9080" 2020/02/07 15:14:59 [error] 32437#0: *149168 [lua] custom.lua:120: phase_fun(): failed to limit req: cannot assign requested address, client: 127.0.0.1, server: , request: "GET /index.html?jwt=... HTTP/1.0", host: "127.0.0.1:9080" 10.112.16.139 is the ip address of the redis server, it seems all redis connections are busy. But if I try to use the original limit count plugin(with redis policy), the performance looks good with the 100000 requests. The code is like this: `local limit_redis_new = require("apisix.plugins.limit-count.limit-count-redis").new` below parts are in function _M.access(conf, ctx) `local function create_limit_obj(conf) core.log.warn("create new limit-count plugin instance") return limit_redis_new("plugin-"..plugin_name, 100000, 60, conf) end` ` local conf = { redis_host = "10.112.16.139", redis_port = 6379, redis_timeout = 1000, } local lim, err = core.lrucache.plugin_ctx(plugin_name, ctx, create_limit_obj, conf) if not lim then core.log.error("error create limit: ", err) return 500 end local delay, remaining = lim:incoming(accountId, true) if not delay then local err = remaining if err == "rejected" then return 503 end core.log.error("failed to limit req: ", err) return 500 end core.response.set_header("X-RateLimit-Limit", limit, "X-RateLimit-Remaining", remaining)` ### Environment * apisix version (cmd: `apisix version`): 1.0 * OS: Ubuntu 16.04.6 LTS
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