[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:93d6b191-35d7-45e8-8be4-99c534a850ba
[En]
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:17b7c265-a94f-44eb-8692-48aaea8d74fe
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:1edf6f2b-ad3f-456f-b520-ff58fdc0b96f
[En]
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:667da21b-c606-44e1-abf3-1f4b92f20465
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:b57c8817-939e-4aa2-837f-5336ea362fbe
[En]
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:cce68b2f-7a6d-4b06-bc4f-1c8020f41645
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:7227194b-7b82-4c04-966a-3eeb8e3ecf4d
[En]
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:2c7d56c6-c127-4aef-8da2-cefd15d5a82e
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:55f3caa1-29d8-4dbd-85f2-017fdcbf5ceb
[En]
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:f44be7e6-1ff1-4bbd-bead-71e45faba15d
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:9fd80e28-a0de-496a-a125-58c37db609b8
[En]
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:83ed076b-d3d7-4c50-bc28-f81fb4ef402d
答题器生成的题目不需要很复杂，为了防止被破解可以添加图片噪点。同时在CDN上缓存图片，避免成为秒杀活动中的短板，影响用户体验。
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:3028660c-e7f0-484e-981e-839781f83092
[En]
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:33435f23-8ed3-41af-ba7b-d8b538df1ac6
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:a9c2fa03-cd43-4283-a6a6-4ce2dd31bc57
[En]
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:b10b585c-3e00-44ca-8f28-ace132860339
服务端性能， 一般用QPS来衡量， 还有一个和QPS息息相关的是响应时间， 它可以理解为服务器处理响应的耗时。
正常情况下响应时间越短， 一秒钟处理的请求数(QPS) 自然也就会越多， 这在单线程处理的情况下看起来是线性的关系，即我们只要把每个请求的响应时间降到最低，那么性能就会最高。
这个两个因素到底会造成什么样的影响？首先， 我们先来看看响应时间和QPS的关系，对于大部分的Web系统而言响应时间一般都是由CPU执行时间和线程等待时间组成，也许你会说为什么不去减少这种等待时间，其实减少线程等待时间对提升性能的影响没有我们想象得那么大， 这点在很多代理服务器上可以做验证，如果代理服务器本身没有CPU消耗， 我们在每次给代理服务器代理的请求加个延时， 即增加响应时间，这对代理服务器本身的吞吐量并没有多大的影响，因为代理服务器本身的资源并没有被消耗。
真正对性能有影响的是CPU的执行时间， 因为CPU的执行真正消耗了服务器的资源， 我们应该致力于减少CPU的执行时间。
对于Java系统可优化的地方很多，除了常见的代码优化外，以下的内容值得注意。
Java和通用的Web服务器相比，在处理大并发的HTTP请求时要弱一点， 所以一般我们都会对大流量的Web系统做静态化改造，让大部分请求和数据直接在Nginx服务器或者Web代理服务器上直接返回 ， 而Java层只需处理少量数据的动态请求。
针对这些请求， 我们可以使用以下手段进行优化：
1.直接使用Servlet处理请求， 避免使用传统的MVC框架， 这样可以绕过一大堆复杂且用处不大的处理逻辑， 直接输出流数据。使用resp.getOutputStream)而不是resp.get Writer函数， 可以省掉一些不变字符数据的编码， 从而提升性能。
2.数据输出时推荐使用JSON而不是模板引擎来输出页面。
3.集中式缓存为了保证命中率一般都会采用一致性Hash， 所以同一个key会落到同一台机器上。那么，该如何彻底解决单点的瓶颈呢? 答案是采用应用层的Local Cache。你需要划分成动态数据和静态数据。
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:88fd2fae-da0b-465a-8644-15c4a165dcbf
[En]
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:4cbd82ca-969d-4249-9af0-1a389a54fe29
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:7bd769a5-a83c-406d-80c8-f5ca61a35362
[En]
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:8bbeaff3-e70b-4c13-9991-bca21962bb8c
Original: https://www.cnblogs.com/hhhnicvscs/p/16707557.html
Author: 平凡程序猿
Title: 聊聊秒杀系统的设计（三）
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