\n| L3<\/td>\n | \u6570\u636e\u6743\u5a01\u6765\u6e90<\/td>\n | –<\/td>\n | \u5f3a\u4e00\u81f4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n 📌\u00a0\u6838\u5fc3\u8ba4\u77e5：Redis\u5728\u5916\u7f6e\u7f13\u5b58\u4f53\u7cfb\u4e2d\u662fL2\u96c6\u7fa4\u5171\u4eab\u5c42\u3002\u5b83\u89e3\u51b3\u7684\u662f\u201c\u591aNginx\u8282\u70b9\u7f13\u5b58\u5b64\u5c9b\u201d\u95ee\u9898，\u800c\u975e\u66ff\u4ee3L1\u672c\u5730\u7f13\u5b58\u3002\u8df3\u8fc7L1\u76f4\u8fdeRedis，\u4f1a\u8ba9Redis\u6210\u4e3a\u65b0\u7684\u5355\u70b9\u74f6\u9888\u3002<\/p>\n 2.2 \u4e3a\u4ec0\u4e48\u4e0d\u7528Nginx\u539f\u751fredis_module？<\/h4>\n\u539f\u751fngx_http_redis_module\u4ec5\u652f\u6301\u53ea\u8bfbGET\u64cd\u4f5c，\u65e0\u8fde\u63a5\u6c60\u3001\u65e0\u5199\u5165\u3001\u65e0\u5220\u9664\u3001\u65e0Cluster\u652f\u6301\u3002\u751f\u4ea7\u73af\u5883\u5fc5\u987b\u4f7f\u7528OpenResty\u751f\u6001\u7684lua-resty-redis\u5e93，\u5b83\u63d0\u4f9b\u4e86：<\/p>\n \n- \u2705 \u5b8c\u6574\u7684Redis\u547d\u4ee4\u652f\u6301（GET\/SET\/HGET\/DEL\/SCAN\u7b49）<\/li>\n
- \u2705 \u57fa\u4e8ecosocket\u7684\u975e\u963b\u585eIO<\/li>\n
- \u2705 \u8fde\u63a5\u6c60\u590d\u7528（set_keepalive）<\/li>\n
- \u2705 Redis Cluster MOVED\/ASK\u81ea\u52a8\u91cd\u5b9a\u5411（\u9700\u914d\u5408lua-resty-redis-cluster）<\/li>\n
- \u2705 Pipeline\u6279\u91cf\u64cd\u4f5c<\/li>\n<\/ul>\n
\n\u4e09\u3001lua-resty-redis \u751f\u4ea7\u7ea7\u5c01\u88c5<\/h3>\n3.1 \u6838\u5fc3\u6a21\u5757\u8bbe\u8ba1<\/h4>\n\u521b\u5efa\u00a0\/usr\/local\/openresty\/lualib\/redis_cache.lua：<\/p>\n local redis = require "resty.redis"
\nlocal cjson = require "cjson.safe"<\/p>\n local _M = {}<\/p>\n — \u2b50 \u8fde\u63a5\u6c60\u914d\u7f6e（\u6839\u636e\u5b9e\u9645\u538b\u6d4b\u8c03\u6574）
\nlocal CONF = {
\n host = "redis-cluster.internal",
\n port = 6379,
\n pool_size = 100, — \u6bcfworker\u8fde\u63a5\u6c60\u5927\u5c0f
\n backlog = 200, — \u7b49\u5f85\u961f\u5217\u957f\u5ea6
\n connect_timeout = 100, — ms
\n send_timeout = 200, — ms
\n read_timeout = 200, — ms
\n}<\/p>\n — \u83b7\u53d6Redis\u8fde\u63a5（\u5e26\u8fde\u63a5\u6c60）
\nlocal function get_redis()
\n local red, err = redis:new()
\n if not red then
\n ngx.log(ngx.ERR, "redis new failed: ", err)
\n return nil, err
\n end<\/p>\n red:set_timeouts(CONF.connect_timeout, CONF.send_timeout, CONF.read_timeout)<\/p>\n local ok, err = red:connect(CONF.host, CONF.port)
\n if not ok then
\n ngx.log(ngx.ERR, "redis connect failed: ", err)
\n return nil, err
\n end<\/p>\n — \u5982\u9700\u5bc6\u7801\u8ba4\u8bc1
\n — local auth_ok, auth_err = red:auth("your_password")
\n — if not auth_ok then return nil, auth_err end<\/p>\n return red, nil
\nend<\/p>\n — \u2b50 \u91ca\u653e\u8fde\u63a5\u5230\u6c60\u4e2d（\u5173\u952e！）
\nlocal function release_redis(red)
\n local ok, err = red:set_keepalive(10000, CONF.pool_size)
\n if not ok then
\n ngx.log(ngx.ERR, "redis keepalive failed: ", err)
\n end
\nend<\/p>\n — \u8bfb\u53d6\u7f13\u5b58
\nfunction _M.get(key)
\n local red, err = get_redis()
\n if not red then return nil, err end<\/p>\n local res, err = red:get(key)
\n release_redis(red)<\/p>\n — \u2b50 \u6b63\u786e\u533a\u5206MISS\u548cERROR
\n if not res then
\n return nil, err — \u7f51\u7edc\/\u534f\u8bae\u9519\u8bef
\n end
\n if res == ngx.null then
\n return nil, "MISS" — Key\u4e0d\u5b58\u5728
\n end<\/p>\n return res, nil
\nend<\/p>\n — \u5199\u5165\u7f13\u5b58（\u5e26TTL）
\nfunction _M.set(key, value, ttl)
\n local red, err = get_redis()
\n if not red then return false, err end<\/p>\n local ok, err = red:setex(key, ttl or 300, value)
\n release_redis(red)<\/p>\n return ok ~= nil, err
\nend<\/p>\n — \u5220\u9664\u7f13\u5b58
\nfunction _M.delete(key)
\n local red, err = get_redis()
\n if not red then return false, err end<\/p>\n local ok, err = red:del(key)
\n release_redis(red)<\/p>\n return ok ~= nil, err
\nend<\/p>\n — \u2b50 \u5b89\u5168\u6279\u91cf\u5220\u9664（SCAN\u66ff\u4ee3KEYS）
\nfunction _M.delete_pattern(pattern)
\n local red, err = get_redis()
\n if not red then return false, err end<\/p>\n local cursor = "0"
\n local total = 0
\n repeat
\n local res, err = red:scan(cursor, "MATCH", pattern, "COUNT", 100)
\n if not res then
\n release_redis(red)
\n return false, err
\n end<\/p>\n cursor = res[1]
\n local keys = res[2]
\n if #keys > 0 then
\n local del_ok, del_err = red:del(unpack(keys))
\n if del_ok then total = total + del_ok end
\n end
\n until cursor == "0"<\/p>\n release_redis(red)
\n return true, nil, total
\nend<\/p>\n return _M<\/p>\n 3.2 \u4e09\u4e2a\u81f4\u547d\u7ec6\u8282\u89e3\u6790<\/h4>\n\u2460 ngx.null \u2260 nil<\/h5>\n— \u274c \u9519\u8bef：\u5c06MISS\u5f53\u4f5c\u6210\u529f
\nlocal res = red:get(key)
\nif res then — ngx.null \u662ftruthy！\u4f1a\u8fdb\u5165\u6b64\u5206\u652f
\n ngx.say(res) — \u8f93\u51fa "null" \u5b57\u7b26\u4e32
\nend<\/p>\n — \u2705 \u6b63\u786e：\u663e\u5f0f\u5224\u65adngx.null
\nif res == ngx.null then
\n — MISS
\nelseif not res then
\n — ERROR
\nelse
\n — HIT
\nend<\/p>\n \u26a0\ufe0f\u00a0\u8fd9\u662fNginx+Redis\u6700\u5e38\u89c1\u7684Bug\u3002ngx.null\u662fLua\u4e2d\u7684\u7279\u6b8a\u5bf9\u8c61，\u8868\u793aRedis\u8fd4\u56de\u7684NIL\u503c\u3002\u5b83\u5728\u6761\u4ef6\u5224\u65ad\u4e2d\u4e3atrue，\u76f4\u63a5\u5f53\u5b57\u7b26\u4e32\u4f7f\u7528\u4f1a\u5bfc\u81f4\u4e0b\u6e38\u89e3\u6790\u5931\u8d25\u3002<\/p>\n \u2461 set_keepalive\u5fc5\u987b\u5728\u6bcf\u6b21\u64cd\u4f5c\u540e\u8c03\u7528<\/h5>\n— \u274c \u9519\u8bef：\u5f02\u5e38\u8def\u5f84\u672a\u91ca\u653e\u8fde\u63a5
\nlocal res, err = red:get(key)
\nif not res then
\n return nil, err — \u8fde\u63a5\u6cc4\u6f0f！
\nend
\nrelease_redis(red)<\/p>\n — \u2705 \u6b63\u786e：\u6240\u6709\u9000\u51fa\u8def\u5f84\u90fd\u91ca\u653e
\nlocal res, err = red:get(key)
\nrelease_redis(red) — \u65e0\u8bba\u6210\u529f\u5931\u8d25\u90fd\u91ca\u653e
\nif not res then return nil, err end<\/p>\n \u2462 SCAN\u66ff\u4ee3KEYS\u662f\u94c1\u5f8b<\/h5>\nKEYS *pattern*\u00a0\u662fO(N)\u5168\u91cf\u626b\u63cf，\u5728\u751f\u4ea7Redis\u4e0a\u6267\u884c\u7b49\u540c\u4e8eDDoS\u653b\u51fb\u3002SCAN\u6e38\u6807\u904d\u5386\u662f\u552f\u4e00\u5b89\u5168\u7684\u6279\u91cf\u64cd\u4f5c\u65b9\u5f0f，\u5373\u4f7f\u5339\u914d\u7ed3\u679c\u4e3a\u7a7a\u4e5f\u5fc5\u987b\u5b8c\u6574\u904d\u5386\u76f4\u5230cursor\u8fd4\u56de"0"\u3002<\/p>\n
\n\u56db\u3001Nginx\u914d\u7f6e\u96c6\u6210\u4e0e\u4e24\u5c42\u7f13\u5b58\u8054\u52a8<\/h3>\n4.1 \u5b8c\u6574\u914d\u7f6e\u793a\u4f8b<\/h4>\nhttp {
\n # L1\u672c\u5730\u7f13\u5b58 + \u5206\u5e03\u5f0f\u9501
\n lua_shared_dict l1_cache 100m;
\n lua_shared_dict cache_locks 10m;<\/p>\n init_by_lua_block {
\n redis_cache = require "redis_cache"
\n cjson = require "cjson.safe"
\n }<\/p>\n server {
\n listen 80;<\/p>\n location \/api\/ {
\n content_by_lua_block {
\n local key = "api:v2:" .. ngx.var.uri<\/p>\n — ===== L1: \u672c\u5730\u5171\u4eab\u5b57\u5178 =====
\n local l1 = ngx.shared.l1_cache
\n local l1_val = l1:get(key)
\n if l1_val then
\n ngx.header["X-Cache"] = "L1-HIT"
\n ngx.say(l1_val)
\n return
\n end<\/p>\n — ===== L2: Redis =====
\n local data, err = redis_cache.get(key)
\n if err and err ~= "MISS" then
\n ngx.log(ngx.WARN, "redis error, fallback to backend: ", err)
\n — \u964d\u7ea7：\u8df3\u8fc7\u7f13\u5b58\u76f4\u63a5\u56de\u6e90
\n goto backend
\n end<\/p>\n if err ~= "MISS" then
\n — Redis HIT \u2192 \u56de\u586bL1
\n l1:set(key, data, 5)
\n ngx.header["X-Cache"] = "L2-HIT"
\n ngx.say(data)
\n return
\n end<\/p>\n — ===== MISS: \u9632\u51fb\u7a7f + \u56de\u6e90 =====
\n ::backend::
\n local locks = ngx.shared.cache_locks
\n local lock_key = "lock:" .. key
\n local elapsed, lerr = locks:add(lock_key, true, 3)<\/p>\n if elapsed then
\n local res = ngx.location.capture("\/internal\/backend")
\n if res.status == 200 then
\n redis_cache.set(key, res.body, 300)
\n l1:set(key, res.body, 5)
\n ngx.header["X-Cache"] = "MISS"
\n ngx.say(res.body)
\n else
\n ngx.status = res.status
\n ngx.say(res.body)
\n end
\n locks:delete(lock_key)
\n else
\n — \u672a\u83b7\u9501：\u77ed\u6682\u7b49\u5f85\u540e\u91cd\u8bd5
\n ngx.sleep(0.1)
\n local retry, rerr = redis_cache.get(key)
\n if retry and rerr ~= "MISS" then
\n ngx.header["X-Cache"] = "LOCK-WAIT-HIT"
\n ngx.say(retry)
\n else
\n — \u964d\u7ea7\u56de\u6e90（\u4e0d\u7f13\u5b58）
\n local res = ngx.location.capture("\/internal\/backend")
\n ngx.header["X-Cache"] = "BYPASS"
\n ngx.status = res.status
\n ngx.say(res.body)
\n end
\n end
\n }
\n }<\/p>\n location \/internal\/backend {
\n internal;
\n proxy_pass http:\/\/backend;
\n proxy_set_header Host $host;
\n }
\n }
\n}<\/p>\n 4.2 goto\u8bed\u6cd5\u7684\u5408\u7406\u4f7f\u7528<\/h4>\nOpenResty\u7684LuaJIT\u652f\u6301goto，\u5728\u7f13\u5b58\u903b\u8f91\u8fd9\u79cd\u591a\u5206\u652f\u8df3\u8f6c\u573a\u666f\u4e2d，\u6bd4\u5d4c\u5957if-else\u6216\u91cd\u590d\u4ee3\u7801\u66f4\u6e05\u6670\u3002\u4f46\u4ec5\u9650\u7f13\u5b58\u6d41\u7a0b\u63a7\u5236\u4f7f\u7528，\u4e1a\u52a1\u903b\u8f91\u4e2d\u5e94\u907f\u514d\u3002<\/p>\n
\n\u4e94\u3001Redis Cluster\u9002\u914d<\/h3>\n5.1 \u4e3a\u4ec0\u4e48\u9700\u8981\u4e13\u95e8\u5904\u7406？<\/h4>\nRedis Cluster\u901a\u8fc7\u54c8\u5e0c\u69fd\u5206\u7247，\u5f53Key\u6240\u5728\u69fd\u8fc1\u79fb\u65f6，\u670d\u52a1\u7aef\u8fd4\u56deMOVED\u6216ASK\u91cd\u5b9a\u5411\u3002lua-resty-redis\u539f\u751f\u4e0d\u5904\u7406\u91cd\u5b9a\u5411，\u9700\u4f7f\u7528lua-resty-redis-cluster\u5e93：<\/p>\n local redis_cluster = require "resty.rediscluster"<\/p>\n local config = {
\n name = "my_cluster",
\n serv_list = {
\n { ip = "10.0.0.1", port = 6379 },
\n { ip = "10.0.0.2", port = 6379 },
\n { ip = "10.0.0.3", port = 6379 },
\n },
\n keepalive_timeout = 10000,
\n keepalive_poolsize = 100,
\n connect_timeout = 100,
\n read_timeout = 200,
\n max_redirection = 5, — \u2b50 \u6700\u5927\u91cd\u5b9a\u5411\u6b21\u6570
\n}<\/p>\n local cluster, err = redis_cluster:new(config)
\n— \u540e\u7eedAPI\u4e0elua-resty-redis\u517c\u5bb9：cluster:get(key), cluster:set(key, val, ttl)<\/p>\n 5.2 Cluster\u6ce8\u610f\u4e8b\u9879<\/h4>\n\n\u8981\u70b9\u8bf4\u660e<\/tr>\n \n\n| \u4e0d\u652f\u6301\u591aKey\u8de8\u69fd\u64cd\u4f5c<\/td>\n | MGET\/MSET\u7684Key\u5fc5\u987b\u5728\u540c\u4e00\u69fd，\u5426\u5219\u62a5\u9519<\/td>\n<\/tr>\n | \n| SCAN\u6309\u8282\u70b9\u6267\u884c<\/td>\n | \u9700\u904d\u5386\u6240\u6709master\u8282\u70b9\u624d\u80fd\u5b8c\u6210\u5168\u91cf\u626b\u63cf<\/td>\n<\/tr>\n | \n| \u8fde\u63a5\u6c60\u6309\u8282\u70b9\u72ec\u7acb<\/td>\n | \u6bcf\u4e2a\u8282\u70b9\u7ef4\u62a4\u72ec\u7acbpool，\u603b\u8fde\u63a5=\u8282\u70b9\u6570\u00d7pool_size<\/td>\n<\/tr>\n | \n| \u62d3\u6251\u53d8\u66f4\u81ea\u52a8\u611f\u77e5<\/td>\n | \u5e93\u4f1a\u81ea\u52a8\u5237\u65b0slot\u6620\u5c04，\u65e0\u9700\u91cd\u542fNginx<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u26a0\ufe0f\u00a0\u907f\u5751：\u82e5\u4f60\u7684Key\u8bbe\u8ba1\u5929\u7136\u5206\u6563\u5728\u4e0d\u540c\u69fd，\u907f\u514d\u4f7f\u7528MGET\u3002\u6539\u4e3aPipeline\u5355\u8282\u70b9\u8bf7\u6c42\u6216\u5e94\u7528\u5c42\u5e76\u53d1\u83b7\u53d6\u3002<\/p>\n
\n\u516d\u3001\u5e8f\u5217\u5316\u683c\u5f0f\u9009\u578b<\/h3>\n6.1 \u6027\u80fd\u5bf9\u6bd4\u5b9e\u6d4b（1KB JSON\u5bf9\u8c61）<\/h4>\n\n\u683c\u5f0f\u7f16\u7801\u8017\u65f6\u89e3\u7801\u8017\u65f6\u4f53\u79ef\u8de8\u8bed\u8a00\u63a8\u8350\u573a\u666f<\/tr>\n \n\n| cjson<\/td>\n | \u57fa\u51c6<\/td>\n | \u57fa\u51c6<\/td>\n | \u57fa\u51c6<\/td>\n | \u2705<\/td>\n | \u901a\u7528API\u54cd\u5e94<\/td>\n<\/tr>\n | \n| MessagePack<\/td>\n | -30%<\/td>\n | -25%<\/td>\n | -20%<\/td>\n | \u2705<\/td>\n | \u9ad8\u9891\u5185\u90e8\u901a\u4fe1<\/td>\n<\/tr>\n | \n| Protobuf<\/td>\n | -60%<\/td>\n | -50%<\/td>\n | -40%<\/td>\n | \u2705<\/td>\n | \u7ed3\u6784\u5316\u6570\u636e\u3001\u5e26\u5bbd\u654f\u611f<\/td>\n<\/tr>\n | \n| Lua table\u5e8f\u5217\u5316<\/td>\n | -70%<\/td>\n | -60%<\/td>\n | -50%<\/td>\n | \u274c<\/td>\n | \u4ec5OpenResty\u5185\u90e8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n6.2 \u4e8c\u8fdb\u5236\u5b89\u5168\u8b66\u544a<\/h4>\n— \u274c JSON\u65e0\u6cd5\u5b89\u5168\u5b58\u50a8\u4e8c\u8fdb\u5236\u6570\u636e
\ncjson.encode({ body = "\\\\xff\\\\xfe\\\\x00" }) — \u53ef\u80fd\u635f\u574f<\/p>\n — \u2705 \u4e8c\u8fdb\u5236\u5185\u5bb9\u4f7f\u7528MessagePack\u6216\u76f4\u63a5\u5b58raw string
\nmp.encode({ body = binary_data })
\n— \u6216
\nredis:set(key, binary_data, ttl) — Memcached\/Redis\u5747\u4e8c\u8fdb\u5236\u5b89\u5168<\/p>\n
\n\u4e03\u3001Key\u8bbe\u8ba1\u89c4\u8303<\/h3>\n7.1 \u547d\u540d\u89c4\u8303<\/h4>\n— \u2705 \u63a8\u8350\u683c\u5f0f：{namespace}:{version}:{entity}:{id}
\n"api:v2:user:profile:10086"
\n"sess:v1:token:abc123def456"
\n"cnt:v1:api:\/users\/list:daily:20260802"<\/p>\n — \u274c \u907f\u514d
\n"\/api\/user\/profile?id=10086" — URI\u4f5cKey，\u53c2\u6570\u987a\u5e8f\u53d8\u5316\u5bfc\u81f4\u91cd\u590d
\n"user_10086" — \u65e0\u547d\u540d\u7a7a\u95f4，\u6613\u51b2\u7a81
\n"a"*300 — \u8d85\u957fKey\u6d6a\u8d39\u5185\u5b58\u548c\u7f51\u7edc<\/p>\n 7.2 \u8bbe\u8ba1\u539f\u5219<\/h4>\n\n\u539f\u5219\u8bf4\u660e<\/tr>\n \n\n| \u53ef\u8bfb\u6027<\/td>\n | \u4fbf\u4e8e\u8c03\u8bd5\u3001\u624b\u52a8\u6e05\u7406\u548c\u76d1\u63a7\u5206\u6790<\/td>\n<\/tr>\n | \n| \u552f\u4e00\u6027<\/td>\n | \u5305\u542b\u5f71\u54cd\u54cd\u5e94\u5185\u5bb9\u7684\u6240\u6709\u53d8\u91cf（method\/args\/header）<\/td>\n<\/tr>\n | \n| \u53ef\u6f14\u8fdb\u6027<\/td>\n | \u5d4c\u5165\u7248\u672c\u53f7，\u53d1\u5e03\u65f6\u53ef\u5e73\u6ed1\u5207\u6362\u65e7\u7f13\u5b58<\/td>\n<\/tr>\n | \n| \u957f\u5ea6\u63a7\u5236<\/td>\n | <256\u5b57\u8282，\u8fc7\u957f\u6d6a\u8d39Redis\u5185\u5b58\u548c\u7f51\u7edc\u5e26\u5bbd<\/td>\n<\/tr>\n | \n| \u53ef\u679a\u4e3e\u6027<\/td>\n | \u652f\u6301SCAN\u6309\u524d\u7f00\u6279\u91cf\u64cd\u4f5c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\u516b\u3001\u751f\u4ea7\u8c03\u4f18\u6e05\u5355<\/h3>\n8.1 \u8fde\u63a5\u6c60Sizing<\/h4>\n\u603b\u5e76\u53d1Redis\u8fde\u63a5 = Nginx worker\u6570 \u00d7 pool_size
\n\u793a\u4f8b：worker=8, pool_size=100 \u2192 \u603b\u8fde\u63a5=800
\nRedis maxclients \u5e94 \u2265 800 \u00d7 1.5 = 1200<\/p>\n \u901a\u8fc7INFO clients\u76d1\u63a7connected_clients，\u5cf0\u503c\u63a5\u8fd1maxclients\u65f6\u9700\u6269\u5bb9\u6216\u8c03\u5927pool\u3002<\/p>\n 8.2 \u8d85\u65f6\u8bbe\u7f6e\u7b56\u7565<\/h4>\n\n\u9636\u6bb5\u63a8\u8350\u503c\u8bf4\u660e<\/tr>\n \n\n| connect_timeout<\/td>\n | 100ms<\/td>\n | \u5feb\u901f\u5931\u8d25，\u907f\u514d\u963b\u585eworker<\/td>\n<\/tr>\n | \n| read_timeout<\/td>\n | 200ms<\/td>\n | P99\u5e94<1ms，200ms\u5df2\u662f\u5bb9\u5fcd\u4e0a\u9650<\/td>\n<\/tr>\n | \n| send_timeout<\/td>\n | 200ms<\/td>\n | \u5927Value\u5199\u5165\u65f6\u9002\u5f53\u653e\u5bbd<\/td>\n<\/tr>\n | \n| keepalive_idle<\/td>\n | 10s<\/td>\n | \u7a7a\u95f2\u8fde\u63a5\u4fdd\u6d3b\u65f6\u95f4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u26a0\ufe0f\u00a0\u94c1\u5f8b：Redis\u64cd\u4f5c\u8d85\u65f6\u5fc5\u987b\u8fdc\u5c0f\u4e8eNginx\u5bf9\u5ba2\u6237\u7aef\u7684\u8d85\u65f6\u3002\u82e5\u5ba2\u6237\u7aef\u8d85\u65f65s，Redis\u8d85\u65f6\u8bbe\u4e3a200ms，\u7559\u51fa\u8db3\u591f\u7684\u964d\u7ea7\u548c\u91cd\u8bd5\u7a97\u53e3\u3002<\/p>\n 8.3 \u6545\u969c\u964d\u7ea7<\/h4>\nlocal data, err = redis_cache.get(key)
\nif err and err ~= "MISS" then
\n ngx.log(ngx.WARN, "redis degraded: ", err)
\n — \u9009\u98791：\u8df3\u8fc7\u7f13\u5b58，\u76f4\u63a5\u56de\u6e90
\n — \u9009\u98792：\u8fd4\u56deL1\u8fc7\u671f\u6570\u636e\u4f5c\u4e3a\u515c\u5e95
\n — \u9009\u98793：\u8fd4\u56de\u9884\u8bbe\u9ed8\u8ba4\u503c
\n — \u2b50 \u6c38\u8fdc\u4e0d\u8981\u8ba9\u7f13\u5b58\u6545\u969c\u53d8\u6210\u670d\u52a1\u6545\u969c
\nend<\/p>\n
\n\u4e5d\u3001\u76d1\u63a7\u6307\u6807\u4f53\u7cfb<\/h3>\n9.1 \u5fc5\u91c7\u6307\u6807<\/h4>\n\n\u6307\u6807\u6765\u6e90\u5065\u5eb7\u9608\u503c\u544a\u8b66\u7ea7\u522b<\/tr>\n \n\n| L1 HIT\u7387<\/td>\n | lua_shared_dict stats<\/td>\n | \u70ed\u70b9\u63a5\u53e3>30%<\/td>\n | P3<\/td>\n<\/tr>\n | \n| L2 HIT\u7387<\/td>\n | Redis INFO stats<\/td>\n | >60%<\/td>\n | P2<\/td>\n<\/tr>\n | \n| Redis P99\u5ef6\u8fdf<\/td>\n | redis_exporter<\/td>\n | <1ms<\/td>\n | P2<\/td>\n<\/tr>\n | \n| \u8fde\u63a5\u6c60\u4f7f\u7528\u7387<\/td>\n | shared_dict stats<\/td>\n | <80%<\/td>\n | P2<\/td>\n<\/tr>\n | \n| Redis\u9519\u8bef\u7387<\/td>\n | error.log\u805a\u5408<\/td>\n | <0.1%<\/td>\n | P1<\/td>\n<\/tr>\n | \n| Redis\u5185\u5b58\u4f7f\u7528\u7387<\/td>\n | redis_exporter<\/td>\n | <75%<\/td>\n | P2<\/td>\n<\/tr>\n | \n| Redis\u9a71\u9010\u7387<\/td>\n | INFO stats evicted_keys<\/td>\n | =0<\/td>\n | P1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n9.2 Grafana\u6838\u5fc3\u9762\u677f<\/h4>\n\n- \u7f13\u5b58\u6f0f\u6597\u56fe：Request \u2192 L1 HIT \u2192 L2 HIT \u2192 Backend，\u76f4\u89c2\u5c55\u793a\u5404\u5c42\u62e6\u622a\u6548\u679c<\/li>\n
- Redis\u5ef6\u8fdf\u70ed\u529b\u56fe：\u6309\u65f6\u95f4\u6bb5\u548c\u547d\u4ee4\u7c7b\u578b\u5206\u5e03，\u5b9a\u4f4d\u6162\u67e5\u8be2<\/li>\n
- \u8fde\u63a5\u6c60\u6c34\u4f4d\u66f2\u7ebf：\u5cf0\u503c\u662f\u5426\u63a5\u8fd1pool_size\u4e0a\u9650<\/li>\n
- \u9519\u8bef\u7387\u8d8b\u52bf：\u7a81\u589e\u662f\u5426\u5173\u8054\u53d1\u5e03\u6216Redis\u6545\u969c<\/li>\n<\/ul>\n
\n\u5341\u3001\u5e38\u89c1\u8e29\u5751\u901f\u67e5\u8868<\/h3>\n\n\u73b0\u8c61\u6839\u56e0\u89e3\u51b3\u65b9\u6848<\/tr>\n \n\n| Redis\u8fde\u63a5\u8017\u5c3d<\/td>\n | \u672a\u7528\u8fde\u63a5\u6c60\u6216pool_size\u8fc7\u5c0f<\/td>\n | set_keepalive + \u589e\u5927pool_size<\/td>\n<\/tr>\n | \n| \u7f13\u5b58\u547d\u4e2d\u4f46\u6570\u636e\u9519\u4e71<\/td>\n | ngx.null\u672a\u6b63\u786e\u5904\u7406<\/td>\n | \u663e\u5f0f\u5224\u65adres == ngx.null<\/td>\n<\/tr>\n | \n| \u70ed\u70b9Key\u6253\u7206\u5355\u5206\u7247<\/td>\n | \u672a\u505aL1\u672c\u5730\u7f13\u5b58<\/td>\n | lua_shared_dict\u62e6\u622a<\/td>\n<\/tr>\n | \n| \u6279\u91cf\u5220\u9664\u8d85\u65f6<\/td>\n | \u4f7f\u7528KEYS\u800c\u975eSCAN<\/td>\n | \u6539\u7528SCAN\u6e38\u6807\u904d\u5386<\/td>\n<\/tr>\n | \n| \u4e8c\u8fdb\u5236\u54cd\u5e94\u7f13\u5b58\u635f\u574f<\/td>\n | JSON\u5e8f\u5217\u5316\u4e8c\u8fdb\u5236\u6570\u636e<\/td>\n | \u6539\u7528MessagePack\u6216raw string<\/td>\n<\/tr>\n | \n| Redis\u6545\u969c\u65f6\u5168\u7ad9500<\/td>\n | \u65e0\u964d\u7ea7\u903b\u8f91<\/td>\n | try-catch\u5305\u88f9，fallback\u5230\u6e90\u7ad9<\/td>\n<\/tr>\n | \n| Cluster\u6269\u7f29\u5bb9\u5927\u91cf500<\/td>\n | \u672a\u5904\u7406MOVED\/ASK<\/td>\n | \u4f7f\u7528lua-resty-redis-cluster<\/td>\n<\/tr>\n | \n| MGET\u8de8\u69fd\u62a5\u9519<\/td>\n | Key\u4e0d\u5728\u540c\u4e00\u54c8\u5e0c\u69fd<\/td>\n | \u62c6\u5206\u8bf7\u6c42\u6216\u5e94\u7528\u5c42\u5e76\u53d1<\/td>\n<\/tr>\n | \n| Lua\u4ee3\u7801\u4fee\u6539\u4e0d\u751f\u6548<\/td>\n | lua_code_cache\u672a\u5f00\u542f<\/td>\n | \u786e\u8ba4lua_code_cache on;<\/td>\n<\/tr>\n | \n| \u5185\u5b58\u6cc4\u6f0f<\/td>\n | Lua\u95ed\u5305\u6301\u6709\u5927\u5bf9\u8c61\u5f15\u7528<\/td>\n | \u53ca\u65f6\u7f6enil + GC\u8c03\u4f18<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\u5341\u4e00\u3001\u7ed3\u8bed<\/h3>\n\u611f\u8c22\u60a8\u7684\u9605\u8bfb！\u5982\u679c\u4f60\u6709\u4efb\u4f55\u7591\u95ee\u6216\u60f3\u8981\u5206\u4eab\u7684\u7ecf\u9a8c，\u8bf7\u5728\u8bc4\u8bba\u533a\u7559\u8a00\u4ea4\u6d41！<\/p>\n","protected":false},"excerpt":{"rendered":" \u4e00\u3001\u5f15\u8a00：\u4e3a\u4ec0\u4e48\u662f Nginx Redis？\u5728\u300aNginx\u5916\u7f6e\u7f13\u5b58\u300b\u7cfb\u5217\u524d\u6587\u4e2d，\u6211\u4eec\u63a2\u8ba8\u4e86\u5916\u7f6e\u7f13\u5b58\u7684\u67b6\u6784\u9009\u578b\u3001Memcached\u7684\u8f7b\u91cf\u7ea7\u573a\u666f\u4ee5\u53caerror_page\u964d\u7ea7\u4f53\u7cfb\u3002\u800c\u5728\u4f01\u4e1a\u7ea7\u751f\u4ea7\u73af\u5883\u4e2d，Nginx Redis\u00a0\u7ec4\u5408\u5360\u636e\u4e86\u5916\u7f6e\u7f13\u5b5890%\u4ee5\u4e0a\u7684\u4efd\u989d\u3002\u539f\u56e0\u5f88\u7b80\u5355：Redis\u4e0d\u4ec5\u662f\u4e00\u4e2aKV\u5b58\u50a8，\u66f4\u662f\u4e00\u4e2a\u652f\u6301\u4e30\u5bcc\u6570\u636e\u7ed3\u6784\u3001\u6301\u4e45\u5316\u3001\u96c6\u7fa4\u6a21\u5f0f\u548c\u53d1\u5e03\u8ba2\u9605\u7684\u901a\u7528\u6570\u636e\u5e73\u53f0\u3002\u4f46\u201c\u80fd\u7528\u201d\u548c\u201c\u7528\u597d\u201d\u4e4b\u95f4\u9694<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[117,105,398],"topic":[],"class_list":["post-89167","post","type-post","status-publish","format-standard","hentry","category-server","tag-nginx","tag-redis","tag-398"],"yoast_head":"\n Nginx\u5916\u7f6e\u7f13\u5b58-nginx + redis - 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