阿里靠什么武功秘籍渡过“双十一“的天量冲击 AI与最新技术演进 介绍人工智能与量子计算、数字货币等方面的最新技术。 beyondma ¥9.901人订阅 去订阅 双十一大概会产生多大的数据量呢,可能大家没概念,举个例子央视拍了这么多年电视新闻节目,几十年下来他存了大概80P的数据。而今年双11一天,阿里要处理970P的数据,做为一个IT人,笔者认为今年”双十一“阿里最大的技术看点有有以下两个: 阿里的数据库,也就是刚刚拿下TPC冠军的OcceanBase,处理峰值也达到了骇人听闻的6100万次/秒, 阿里核心系统百分百上云了。 如果把信息系统比做一个武林高手,那么如此之大的交易量代表了他的刚猛威武,而全面触云又代表他灵动飘逸。而能把刚猛和灵活完美结合是简直是神才能达到的境界。 上云虽好,但不适合大规模计算,由于底层与用户之间多了一个虚拟化层,所以云计算平台一般都会产生10%左右的调度损耗,而这10%的损耗也让很多密集计算型的应用场景不太合适使用云平台。所以站在IT视角,云计算也不太合适双十一的场景。那么阿里刚猛兼顾灵活的武功是如何练成的呢? 乾坤大挪移-Tair 通过阿里的官宣来看在Tair之前还有一个LVS的负载均衡层,不过那些都不是国产的自研技术,也不细表了。 Tair是阿里自研的开源缓存服务中间件(Github地址:。https://github.com/alibaba/tair)提供快速访问的内存(MDB引擎)/持久化(LDB引擎)存储服务,基于高性能、高可用的分布式集群架构,满足读写性能要求高及容量可弹性伸缩的业务需求,在双十一秒杀的体系内完成乾坤大挪移般的加速工作。 通常情况下,一个 Tair 集群中包含2台 Configserver 及多台 DataServer。其中两台 Configserver 互为主备。通过和 Dataserver 之间的心跳检测获取集群中存活可用的 Dataserver,构建数据在集群中的分布信息。Dataserver 负责数据的存储,并按照 Configserver 的指示完成数据的复制和迁移工作。Client 在启动的时候,从 Configserver 获取数据分布信息,根据数据分布信息,和相应的 Dataserver 进行交互,完成用户的请求。 其核心的模块就是Configserver,具体的代码在https://github.com/alibaba/tair/blob/master/src/configserver/conf_server_table_manager.cpp 以初始化函数为例: using namespace std; void conf_server_table_manager::init() { flag = client_version = server_version = server_bucket_count = server_copy_count = plugins_version = area_capacity_version = last_load_config_time… Read More
How to remove all formula references but keep values in cells in Excel? Select the cells you need to remove all references, then press Ctrl + C keys, keep these cells selected, right click and select Values under Paste Options section. Then you can see all formula references of selected cells are removed immediately, and only kept the cell values as below screenshot shown. https://www.extendoffice.com/documents/excel/4228-excel-remove-reference-keep-value.html… Read More
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Get the NumSuffix(English) Function OrdinalSuffix(ByVal Num As Long) As String Dim n As Long Const cSfx = “stndrdthththththth” ‘ 2 char suffixes n = Num Mod 100 If ((Abs(n) >= 10) And (Abs(n)… Read More
接电话技巧 解释不能接电话的原因 A.她外出不在 1. She is not in (out). 2. She is away from her desk (not at her desk). 3. She is out for lunch. 4. She is out for the rest of the day. 5. She has left already. 6. She hasn’t come in yet. 7. She’s just stepped out Receiver: 她外出不在 1. 她不在… Read More
Could you repeat that , please? repeat that ->right repeat again ->wrong = Could you say again, please?… Read More
Model Verbs’s level 1 will 100%definite 2 must by law/order 3 should compulsory 4 ought to advice 5 shall 6 can 7 could 8 would 9 may not sure 10 might very unsure… Read More