{"id":39757,"date":"2025-05-25T22:08:30","date_gmt":"2025-05-25T14:08:30","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/39757.html"},"modified":"2025-05-25T22:08:30","modified_gmt":"2025-05-25T14:08:30","slug":"%e3%80%90java%e9%ab%98%e9%98%b6%e9%9d%a2%e7%bb%8f%ef%bc%9a%e5%be%ae%e6%9c%8d%e5%8a%a1%e7%af%87%e3%80%917-1%e7%a7%92%e5%93%8d%e5%ba%94%e4%bf%9d%e9%9a%9c%ef%bc%9a%e8%b6%85%e6%97%b6%e6%8e%a7%e5%88%b6","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/39757.html","title":{"rendered":"\u3010Java\u9ad8\u9636\u9762\u7ecf\uff1a\u5fae\u670d\u52a1\u7bc7\u30117. 1\u79d2\u54cd\u5e94\u4fdd\u969c\uff1a\u8d85\u65f6\u63a7\u5236\u5982\u4f55\u6210\u4e3a\u9ad8\u5e76\u53d1\u7cfb\u7edf\u7684\u201c\u6551\u706b\u961f\u957f\u201d\uff1f"},"content":{"rendered":"

\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

\u4e00\u3001\u5168\u94fe\u8def\u8d85\u65f6\u5efa\u6a21\uff1a\u4ece\u7528\u6237\u9700\u6c42\u5230\u7cfb\u7edf\u5206\u89e3<\/h3>\n

1.1 \u7aef\u5230\u7aef\u65f6\u95f4\u9884\u7b97\u5206\u914d<\/h4>\n

\u9ec4\u91d1\u516c\u5f0f\uff1a<\/p>\n

\u7528\u6237\u671f\u671b\u54cd\u5e94\u65f6\u95f4 = \u7f51\u7edc\u4f20\u8f93\u65f6\u95f4 + \u670d\u52a1\u5904\u7406\u65f6\u95f4 + \u4e0b\u6e38\u8c03\u7528\u65f6\u95f4 + \u7f13\u51b2\u65f6\u95f4<\/p>\n

\u5178\u578b\u5206\u914d\u7b56\u7565\uff08\u4ee51\u79d2\u76ee\u6807\u4e3a\u4f8b\uff09\uff1a<\/p>\n\n\n \u73af\u8282
\n \u65f6\u95f4\u9884\u7b97
\n \u4f18\u5316\u76ee\u6807
\n <\/tr>\n\n\n\n\n\n\n\n
\u5ba2\u6237\u7aef\u6e32\u67d3<\/td>\n100ms<\/td>\n\u9aa8\u67b6\u5c4f\uff08Skeleton\uff09\u9884\u6e32\u67d3<\/td>\n<\/tr>\n
\u8fb9\u7f18\u8282\u70b9\uff08CDN\uff09<\/td>\n100ms<\/td>\n\u9759\u6001\u8d44\u6e90\u7f13\u5b58\u547d\u4e2d\u7387\uff1e95%<\/td>\n<\/tr>\n
API\u7f51\u5173\u8f6c\u53d1<\/td>\n50ms<\/td>\n\u8def\u7531\u51b3\u7b56\u4e0e\u9274\u6743\u8017\u65f6\uff1c30ms<\/td>\n<\/tr>\n
\u4e1a\u52a1\u670d\u52a1\u5904\u7406<\/td>\n350ms<\/td>\n\u6838\u5fc3\u903b\u8f91+\u7f13\u5b58\u8bbf\u95ee\u2264200ms<\/td>\n<\/tr>\n
\u4e0b\u6e38\u670d\u52a1\u8c03\u7528<\/td>\n300ms<\/td>\n\u5355\u4f9d\u8d56\u8c03\u7528\u2264150ms\uff0c\u6700\u591a2\u7ea7\u4e32\u884c<\/td>\n<\/tr>\n
\u7f13\u51b2\u65f6\u95f4<\/td>\n100ms<\/td>\n\u5e94\u5bf9\u7a81\u53d1\u5ef6\u8fdf\uff08\u5982GC\u505c\u987f\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

1.2 \u8d85\u65f6\u4f20\u9012\u673a\u5236\u8bbe\u8ba1<\/h4>\n

1.2.1 \u8d85\u65f6\u65f6\u95f4\u6233\u4f20\u9012\uff08\u5168\u5c40\u65f6\u949f\u540c\u6b65\uff09<\/h5>\n

\/\/ \u5ba2\u6237\u7aef\u53d1\u8d77\u8bf7\u6c42\uff08Go\u8bed\u8a00\u793a\u4f8b\uff09<\/span>
\nctx,<\/span> cancel :=<\/span> context.<\/span>WithTimeout<\/span>(<\/span>context.<\/span>Background<\/span>(<\/span>)<\/span>,<\/span> 1<\/span>*<\/span>time.<\/span>Second)<\/span>
\ndefer<\/span> cancel<\/span>(<\/span>)<\/span>
\n\/\/ \u8ba1\u7b97\u8d85\u65f6\u65f6\u95f4\u6233\uff08Unix\u65f6\u95f4\u6233+\u6beb\u79d2\uff09<\/span>
\ndeadline :=<\/span> time.<\/span>Now<\/span>(<\/span>)<\/span>.<\/span>Add<\/span>(<\/span>1<\/span>*<\/span>time.<\/span>Second)<\/span>.<\/span>UnixNano<\/span>(<\/span>)<\/span> \/<\/span> 1e6<\/span>
\nmetadata :=<\/span> metadata.<\/span>Pairs<\/span>(<\/span>\\”x-deadline\\”<\/span>,<\/span> strconv.<\/span>FormatInt<\/span>(<\/span>deadline,<\/span> 10<\/span>)<\/span>)<\/span>
\nctx =<\/span> metadata.<\/span>NewOutgoingContext<\/span>(<\/span>ctx,<\/span> metadata)<\/span><\/p>\n

\/\/ \u670d\u52a1\u7aef\u89e3\u6790\u8d85\u65f6\u65f6\u95f4<\/span>
\nfunc<\/span> handleRequest<\/span>(<\/span>ctx context.<\/span>Context)<\/span> {
\n <\/span>
\n md,<\/span> _<\/span> :=<\/span> metadata.<\/span>FromIncomingContext<\/span>(<\/span>ctx)<\/span>
\n if<\/span> deadlineStr :=<\/span> md.<\/span>Get<\/span>(<\/span>\\”x-deadline\\”<\/span>)<\/span>;<\/span> len<\/span>(<\/span>deadlineStr)<\/span> ><\/span> 0<\/span> {
\n <\/span>
\n deadline,<\/span> _<\/span> :=<\/span> strconv.<\/span>ParseInt<\/span>(<\/span>deadlineStr[<\/span>0<\/span>]<\/span>,<\/span> 10<\/span>,<\/span> 64<\/span>)<\/span>
\n if<\/span> time.<\/span>Now<\/span>(<\/span>)<\/span>.<\/span>UnixNano<\/span>(<\/span>)<\/span>\/<\/span>1e6<\/span> ><\/span> deadline {
\n <\/span>
\n return<\/span> errors.<\/span>New<\/span>(<\/span>\\”request timeout\\”<\/span>)<\/span>
\n }<\/span>
\n }<\/span>
\n \/\/ \u4e1a\u52a1\u5904\u7406\u903b\u8f91<\/span>
\n}<\/span><\/p>\n

1.2.2 \u5269\u4f59\u65f6\u95f4\u4f20\u9012\uff08\u52a8\u6001\u8ba1\u7b97\uff09<\/h5>\n

\/\/ \u7f51\u5173\u5c42\u8bbe\u7f6e\u521d\u59cb\u8d85\u65f6\uff081000ms\uff09<\/span>
\nRequestContext<\/span>.<\/span>setTimeout<\/span>(<\/span>1000<\/span>)<\/span>;<\/span><\/p>\n

\/\/ \u4e0b\u6e38\u670d\u52a1A\u5904\u7406\uff08\u6d88\u8017300ms\uff09<\/span>
\npublic<\/span> void<\/span> serviceA<\/span>(<\/span>)<\/span> throws<\/span> InterruptedException<\/span> {
\n <\/span>
\n Thread<\/span>.<\/span>sleep<\/span>(<\/span>300<\/span>)<\/span>;<\/span>
\n RequestContext<\/span>.<\/span>reduceTimeout<\/span>(<\/span>300<\/span>)<\/span>;<\/span> \/\/ \u5269\u4f59700ms<\/span>
\n serviceB<\/span>(<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/ \u4e0b\u6e38\u670d\u52a1B\u5904\u7406\uff08\u6d88\u8017400ms\uff09<\/span>
\npublic<\/span> void<\/span> serviceB<\/span>(<\/span>)<\/span> throws<\/span> InterruptedException<\/span> {
\n <\/span>
\n int<\/span> remaining =<\/span> RequestContext<\/span>.<\/span>getTimeout<\/span>(<\/span>)<\/span>;<\/span> \/\/ 700ms<\/span>
\n if<\/span> (<\/span>remaining <=<\/span> 0<\/span>)<\/span> throw<\/span> new<\/span> TimeoutException<\/span>(<\/span>)<\/span>;<\/span>
\n Thread<\/span>.<\/span>sleep<\/span>(<\/span>400<\/span>)<\/span>;<\/span> \/\/ \u5269\u4f59300ms\u4f20\u9012\u7ed9\u670d\u52a1C<\/span>
\n}<\/span><\/p>\n

\u4e8c\u3001\u7cbe\u51c6\u8d85\u65f6\u63a7\u5236\u6280\u672f\uff1a\u4ece\u7f51\u7edc\u5230\u670d\u52a1\u7684\u591a\u5c42\u4f18\u5316<\/h3>\n

2.1 \u7f51\u7edc\u5c42\u6027\u80fd\u8c03\u4f18<\/h4>\n

2.1.1 Nginx\u8d85\u65f6\u914d\u7f6e\u6700\u4f73\u5b9e\u8df5<\/h5>\n

http {
\n # \u8fde\u63a5\u8d85\u65f6\u63a7\u5236
\n connect_timeout 1s; # \u4e0e\u540e\u7aef\u5efa\u7acb\u8fde\u63a5\u7684\u8d85\u65f6\u65f6\u95f4
\n send_timeout 2s; # \u5411\u540e\u7aef\u53d1\u9001\u8bf7\u6c42\u7684\u8d85\u65f6\u65f6\u95f4
\n proxy_read_timeout 800ms; # \u4ece\u540e\u7aef\u8bfb\u53d6\u54cd\u5e94\u7684\u8d85\u65f6\u65f6\u95f4<\/p>\n

# \u957f\u8fde\u63a5\u590d\u7528
\n keepalive_timeout 30s; # \u4fdd\u6301\u957f\u8fde\u63a5\u7684\u65f6\u95f4
\n keepalive_requests 1000; # \u5355\u4e2a\u8fde\u63a5\u5141\u8bb8\u7684\u6700\u5927\u8bf7\u6c42\u6570
\n}<\/p>\n

server {
\n location \/api {
\n proxy_pass http:\/\/upstream;
\n # \u4f20\u9012\u5ba2\u6237\u7aef\u8d85\u65f6\u5230\u540e\u7aef
\n proxy_set_header X-Timeout $http_x_timeout;
\n }
\n}<\/p>\n

2.1.2 TCP\u53c2\u6570\u4f18\u5316\uff08Linux\u7cfb\u7edf\uff09<\/h5>\n

# \u51cf\u5c11TIME_WAIT\u72b6\u6001\u8fde\u63a5<\/span>
\nnet.ipv4.tcp_tw_reuse =<\/span> 1<\/span>
\nnet.ipv4.tcp_tw_recycle =<\/span> 1<\/span><\/p>\n

# \u8c03\u6574TCP\u7f13\u51b2\u533a<\/span>
\nnet.ipv4.tcp_rmem =<\/span> 4096<\/span> 87380<\/span> 6291456<\/span>
\nnet.ipv4.tcp_wmem =<\/span> 4096<\/span> 65536<\/span> 4194304<\/span><\/p>\n

2.2 \u670d\u52a1\u7aef\u5f02\u6b65\u5316\u4e0e\u5e76\u884c\u5904\u7406<\/h4>\n

2.2.1 \u5e76\u884c\u8c03\u7528\u538b\u7f29\u8017\u65f6<\/h5>\n

\/\/ \u5e76\u884c\u8c03\u7528\u98ce\u63a7\u4e0e\u5e93\u5b58\u670d\u52a1\uff08CompletableFuture\uff09<\/span>
\nCompletableFuture<\/span><<\/span>RiskResult<\/span>><\/span><\/span> riskFuture =<\/span> CompletableFuture<\/span>.<\/span>supplyAsync<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {
\n <\/span>
\n return<\/span> riskService.<\/span>checkRisk<\/span>(<\/span>order)<\/span>;<\/span>
\n}<\/span>)<\/span>;<\/span><\/p>\n

CompletableFuture<\/span><<\/span>StockResult<\/span>><\/span><\/span> stockFuture =<\/span> CompletableFuture<\/span>.<\/span>supplyAsync<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {
\n <\/span>
\n return<\/span> stockService.<\/span>checkStock<\/span>(<\/span>order)<\/span>;<\/span>
\n}<\/span>)<\/span>;<\/span><\/p>\n

\/\/ \u5408\u5e76\u7ed3\u679c\uff0c\u8bbe\u7f6e\u603b\u8d85\u65f6600ms<\/span>
\nCompletableFuture<\/span>.<\/span>allOf<\/span>(<\/span>riskFuture,<\/span> stockFuture)<\/span>
\n .<\/span>thenApply<\/span>(<\/span>v -><\/span> {
\n <\/span>
\n try<\/span> {
\n <\/span>
\n return<\/span> new<\/span> OrderResult<\/span>(<\/span>riskFuture.<\/span>get<\/span>(<\/span>)<\/span>,<\/span> stockFuture.<\/span>get<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n }<\/span> catch<\/span> (<\/span>Exception<\/span> e)<\/span> {
\n <\/span>
\n throw<\/span> new<\/span> <\/p>\n","protected":false},"excerpt":{"rendered":"

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