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your tickets will be sold the day after tomorrow. 在 the day after tomorrow 前面有没有介词?

2023-07-08 01:21:58
共3条回复
左迁

没有。打个比方,Tomorrow,I will go to Shanghai. 这里Tomorrow 前面也是没有介词的,因为它本身就是就是可以做时间状语的。那the day after tomorrow只是在tomorrow前多了修释而已。

wio

你好!

没有的,the day after tomorrow就是表示后天的意思,是个固定短语,不需要介词的

大鱼炖火锅

不用。the day after tomorrow是后天的意思。用法与yesterday, today, tomorrow的用法一样

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it什么again the day after tomorrow?

the day after tomorrow后天,表示一般将来时态,此处填 will rain 或 is going to rain
2023-07-07 23:58:204

英语改错

1.My friend is coming at the day after the next day.2.Are you cooking the dinner this evening?3.My brother is not going out this weekend.4.Helen and Tony brought some CDs to the party on Friday.5.I will starting a new job the day next tomorrow.7.Stefano has seen the doctor for three days" time.8.When is Alex coming home from school this afternoon?
2023-07-07 23:58:3015

英语改错1.My friend is arriving the day after the next2.Are you?

1.My friend is arriving the day after the next My friend is arriving the day after tomorrow. 2.Are you cook the dinner this evening? Will you cook the dinner this evening? 3.My brother not going out this weekend. My brother will not go out this weekend. 4.Helen and Tony bring some CDs to the party on Friday. Helen and Tony will bring some CDs to the party on Friday. 5.I"m starting a new job the day next tomorrow. I"m starting a new job the day after tomorrow. 6.Rebecca doesn"t sing at the concert next week. Rebecca will not sing at the concert next week. 7.Stefano is seeing the doctor for three days" time. Stefano will see the doctor for three days" time. 8.When Alex is ing home from school this afternoon? When is Alex ing home from school this afternoon?,4,1.My friend is arriving the day after the next day. is arriving改为will arrive My friend will arrive the day after the next day. 2.Are you cook the dinner this evening? are 改为will Wi...,4,0.0.0,3,1. the next----next 2.Are---Do 3.not------- is not 4.bring-------will bring 5.next-------- after 6.doesn"t----won"t 7.for-------in 8.Alex is-------is Alex,3,很厉害,我看不懂,2,the day 放在next 后面,2,1,arrive是瞬间动作,所以不能用进行时,可以用e 2,把are 改为will 3,not前加is 4,bring前面加will 5,start和第一题道理一样.I"m starting 改为I will start 6,doesn"t改为won"t 7, times删去 8, is Alex ing home from ...,2,1.My friend is arriving the day after TOMOROW 2.Are you cookING the dinner this evening? 3.My brother IS not going out this weekend. 4.Helen and Tony WILL bring some CDs to the party on Fr...,2,1.My friend will arrive the day after the next 2.will you cook the dinner this evening? 3.My brother will not go out this weekend. 4.Helen and Tony will bring some CDs to the party on Fr...,1,1.My friend is ing at the day after the next day. 2.Are you cooking the dinner this evening? 3.My brother is not going out this weekend. 4.Helen and Tony brought some CDs to the party o...,1,1. arriving ----ing 2..Are ---Do 3.not前加is4.bring---brought5.I"m starting --I will start 6.doesn:t---will not 7. is seeing改为has been seeing 8.is ing ----will e,1,1.is arriving改成will arrive 2.Are you cook 改成Will you cook 3.not going 改成will not go或won"t go 4.bring改成will bring 5.I"m starting 改为I"ll start 纯手打 望采纳,1,1.My friend is arriving 【the day after the next】 改为【the day after tomorrow】 2.【Are】 you cook the dinner this evening? 改为【Will】 3.My brother【这里添加is】 not going out this weekend. 【进行时表将来】 ,1,1.the next——tomorrow 2.are—will 3.didn"t 4.are going to bring 5.next—after 6.won"t 7.seeing—asking 8.When is Alex ing…… Alex和is颠倒,0,1.My friend is arriving the day after (the next )改为 tomorrow 2.Are you (going to)cook the dinner this evening? 3.My brother(is) not going out this weekend. 4.Helen and Tony (will ) bring s...,0,都错了第一个时态错了,0,1.My friend is arriving the day after the next day. is arriving改为will arrive My friend will arrive the day after the next day. 2.Are you cook the dinner this evening? are 改为will Wi...,0,八道题都与一般将来时态有关 1.My friend is arriving the day after the next My friend will arrive the day after tomorrow (arrive 没有进行时表将来时之意,故用will将来时。the next day是以当时时间算起的第二天,但是没有the day after the next,...,0,1.My friend is arriving on the day after the next the day 前加on(be+arriving表将来) 2.Are you cooking the dinner this evening? cook改为cooking 3.My brother is not going out this weekend. ...,0,英语改错 1.My friend is arriving the day after the next 2.Are you cook the dinner this evening? 3.My brother not going out this weekend. 4.Helen and Tony bring some CDs to the party on Friday. 5.I"m starting a new job the day next tomorrow. 6.Rebecca doesn"t sing at the concert next week. 7.Stefano is seeing the doctor for three days" time. 8.When Alex is ing home from school this afternoon? 麻烦高手们把错得地方写出来,再写出正确的句子. 这么多,我不知道哪个是对的了
2023-07-07 23:58:551

There ()a meeting tomorrow afternoon. A will B will going to be C is going to be D will go to be He

第一个是单数所以是C
2023-07-07 23:59:034

帮我用英语写一篇《The Day After Tomorrow》的观后感,谢谢

The day after tomorrow down for a long time. Unfortunately, a version of the film, the black screen of Baji, from time to time there are a few big shadow, looked tired on, it has not thrown in the tube. These days hard drive space for the growing tension, was determined to read it. After reading, and I laughed. Global climate change, the emergence of a new Ice Age. Two days before the German TV is always such a title. Also found a large number of experts and scholars to discuss the issue, said that if global climate warming continue to affect the North Atlantic ocean currents, such a catastrophe is possible. The Germans do, the more widespread awareness of environmental protection in the country"s construction and industrial and agricultural production in or pay attention to environmental protection everywhere, so I think the Germans to discuss this issue is that some of the capital. However, such an order because of global climate change resulting from the disaster as a theme of the film is actually global warming has an inescapable responsibility of the world"s largest emitters of greenhouse gases - the United States of the shooting, is a little bit so that Ironically, the people. Do not worry everyone, this is not the most ridiculous, this show is yet to come! At the end of the film, the U.S. agency that "President" in the Aftermath of the world: "Please come to your friendly With the acceptance of "homeless" of the American people. ""s Request, I had laughed! Are Americans really do not know what they are in reality the president has done what it?! Really know if there might be such a Consequences, and that is why the President of the United States in hand to control global emissions of greenhouse gases "Kyoto treaty" signed, and despite the subsequent refusal to honor the implementation of the relevant provisions of the treaty. If there is a day on Earth have taken place in such a catastrophe, the United States bears a great responsibility! Said to be guilty is not an exaggeration. However, while the others into trouble!
2023-07-07 23:59:131

day after tomorrow(是怎么理解为〈后天的〉)

理解为后天
2023-07-07 23:59:215

seeyouthedayaftertomorrow是啥意思

后天见。the day after tomorrow,后天的意思
2023-07-07 23:59:365

前天下午用英语怎么说

问题一:前天早上 英语怎么说? 一、前天早上及其他 1、two mornings ago 是错误的,因为 morning 只属于一天中三个时间段中的的一段,几个 morning 中间还有 afternoon 和 evening,不可能连起来构成一个延续在一起的 mornings“三个没有分开的造成以前” 2、the morning two days ago. 是正确的。 3、the morning before two days 也是错误的,因为 before 指的是在一个时间点以前,而 two days 是时间段,表示时间点以前只能用副词 ago 4、the day before yesterday morning 可以这样讲,因为前一天可能与昨天早晨接在一起。 二、某时间的前后的表示方法即举例 1、表示现在某时间的前后 前/上上… ―― the …before … 前天:the day before yesterday 前天上午:the morning before yesterday 上上周:the week before last 前年:the year before last 后/下下…―― the…after 后天:the day after tomorrow 后天下午:the afternoon after tomorrow 下下周:the week after next 后年:the year after next 大前 ―― three … ago 大前天:three days ago 大前周:three week ago 大前年:three years ago 大后… ―― three… from now 大后年:three days from now 大后年:three years from now 若干…前 ―― 数词 + 时间名词 + ago 四天前:four days ago 五周前:five weeks ago 六年前:six years ago 若干…后 ―― 数词 + 时间名词 + from now 四天后:four days from now 五周前:five weeks from now 六年前:six years from now 若干天前后的某时段―― the + 时间段 + 数词 + days + ago/from now 大前天早上:the morning three days ago 大后天早上:the morning three days from now 九天前的夜晚:the evening nine evenings ago 九天后的夜晚:the evening nine days from now 2、表示过去某时的前后时间(即用在间接引语时的用法) 前/上上… ―― the…before the last …(即把上面的before…用带定冠词的 the last…表示) 前天:the day before the last day 前天上午:the morning before the las......>> 问题二:“前天上午”用英语怎么表达? the day before yesterday m畅rning the day before yesterday night the day after tomorrow morning the day after tomorrow night 这就是地道的表达. 问题三:今天下午 昨天下午 前天下午的英文怎么说 今天下午 this afternoon 昨天下午 yesterday afternoon 前天下午 the afternoon of the day before yesterday 问题四:明天中午和前天中午用英语应该怎么说 tomorrow noon the noon of the day before yesterday 问题五:明天中午和前天中午用英语应该怎么说?是tomorrow noon,yesterday noon吗? 是的。就像tomorrow night 问题六:在前天晚上 用英语怎么说 i went to T唬m"s home the night before yesterday. 例子说明了,不用ON也不用AT啦。。。。
2023-07-07 23:59:491

VPS推荐,Vultr和阿里云万网,哪个比较适合

兔子vps1、提供换ip功能,包含静态线路和动态线路选择2、提供全国20多个省300+城市ip地址随意选择3、提供静态ip地址长期使用
2023-07-07 23:53:293

高中生一枚,我想请问理科和工科有什么区别??

理科就是学理论的科目,工科就是学工程的科目
2023-07-07 23:53:316

清迈必去的咖啡馆和餐厅推荐

一提起泰国清迈,绝对是跟曼谷普吉岛不一样的城市,它是一座悠闲的靠着山的小城市,一想到清迈那肯定就是山野之间,咖啡小馆,还有spa了!那我们看看清迈有哪些值得一去的餐厅和咖啡馆吧!玻璃房里的冰品店cheevitcheeva这家韩式冰品cafe开在一个绿荫的大树下的玻璃房里,门口种满绿植,藤蔓植物垂下来,很有夏日的感觉。值得一提的是,cafe旁边开着看上去不起眼,却在清迈排名第一的Spa馆。小店虽然不大,但是设计得别有用心,头顶悬挂了各样的蕨类植物,每一个餐桌上都插着一株明媚的向日葵花。虽然是咖啡馆,却既以冰品为名,招牌抹茶绵绵冰,大大的绵绵冰上撒上苦涩清香的日本抹茶粉,覆以红豆和果仁,一旁还赠送抹茶大福。一口吃掉夏天的感觉。地址|6Soi7SirimangkhalajarnRoad|SuthepSubdistrict,ChiangMai可以滑梯的泰式咖啡馆No.39坐落在荒凉村落边的这家cafe,最大的特色就是湖边有一个小木屋。不想走路下楼,可以滑滑梯下来。树下还有藤编的露天“榻榻米”,夏天的午后,赤足盘腿坐在树下湖边,特别惬意而悠闲。这家咖啡馆出售一种手工泰茶咖啡,来到清迈,可以见识到各种各样的泰茶,这种茶叶给人感觉有深烘焙的香气,闻起来像大米和谷子。加上咖啡之后,浓郁而奇异,淡淡的香料味却毫无违和感。地址|Suthep,ChiangMai50200,Thailand洞穴咖啡馆SS1254372CAFE一家风情的咖啡屋,大门和窗户设计成圆形的样子,让我想起《霍比特人》里的小房子。但是这样一家非常“外貌协会”的咖啡馆,出品的咖啡却十分好喝。招牌焦糖拿铁、卡布奇诺都是热卖饮品。喝完咖啡,可以到店中店的艺术品店转转,观赏艺术家的作品,可以淘一些原创艺术品、雕塑、衣服和手工物件,十分适合带回去作手信。地址|6Soi7SirimangkhalajarnRoad|SuthepSubdistrict,ChiangMaiRustic&Blue早晨,当然也少不了咖啡!这家cafe除了咖啡,brunch也非常有名,享受一顿丰盛的早餐和咖啡,才是清迈的生活方式。培根煎蛋吐司,使用了清新的泰国香料,面包烤得酥脆、香喷喷的。鲜艳的沙拉菜运用了许多清迈当地的有机蔬菜,色彩搭配鲜艳而清爽。地址|2Nimmansoi7,ChiangMai50100tAnchanNoodles蓝面条顾名思义是浪漫的蓝色,其实是东南亚菜中常常用到的一种植物染料:蝶豆花,融水后可以给食物染上曼妙的紫蓝色,本身也有甜味。尝试了蝶豆花面条(汤与捞面)、蓝汽水,最好吃的是捞面,搭配的猪肉肉质很不错,与特别的辣椒酱混在一起吃很开胃,面条本身有淡淡的甜味。蓝汽水有点甜腻,不推荐。地址:Nimmanheamin路7巷(靠近SirimangklajarnRd)烤海鲜烤海鲜是一位当地人推荐给我们的,说是清迈必吃之地~这一行下来,的却它给我们的幸福感最高,塔佩门附近,海鲜套餐分三种价格为399/699/999。海鲜非常新鲜,个头大,肉饱满,有龙虾、扇贝、青口等,吃起来非常过瘾。除了烤海鲜,还可以试试冬阴功海鲜火锅,酸酸辣辣的味道和海鲜的鲜香~让人回味,把整锅汤都喝完了。地址:ChiangMai128-130(中午不营业)有机三兄弟Ohkajhu大名鼎鼎的Ohkajhu餐厅,作为有机餐厅被清迈人所熟知,里所有的蔬菜都来自自家的有机农场,不添加任何化学肥料,一进餐厅,排队约半个小时,店家就给我们送了两盒有机蔬菜。因为机场附近就有一家(依旧难找),所以大家可以根据行程安排提前来机场店吃或者去农场店。这里的鲜蔬果汁很有名,五十多种配方和各种色彩斑斓的蔬果,让人感到浓郁的田园风情。装在玻璃壶里的是几种绿色蔬果榨汁的果汁,入口有新鲜的植物气息。最大的感受,就是这里的配菜真的没有在节约,盘子如脸盆大,各种新鲜的蔬菜堆叠于上,浇上沙拉汁。感觉把这辈子的沙拉份额都吃完了。喜欢香煎的猪肋骨,酱汁甜而浓稠,肉质很好,关键是XXXL号的分量。地址:农场店121OuterRingRoad,Sansai,ChiangMai机场店LoiKroaLane6,ChangKhlan,ChiangMai
2023-07-07 23:53:321

Xcode8 不能显示blame,show blame for line 灰色不可点怎么办

Xcode7是iOS9了,对程序做了一些调整,给程序猿挖了点坑。一、iOS9 bitcode首先最大的问题就是坑货xcode7,xcode7默认是打开bitcode的,bitcode是苹果为了解决他自己以后的应用可以随意更换硬件的处理做的准备也就是arm指令集和x64指令集的问题那么我们的工程如果你采用了别人封装的第三方库,那么好了,会爆以下错误ld: ‘/UsersFramework/SDKs/PolymerPay/Library/mobStat/lib**SDK.a(**ForSDK.o)"does not contain bitcode. You must rebuild it with bitcode enabled (Xcodesetting ENABLE_BITCODE), obtain an updated library fromthe vendor, or disablebitcode for this target. for architecture arm64上述这段文字说明了我们的第三方库不支持bitcode,如果你需要支持,就需要这个第三方库也支持bitcode。苹果目前给出的临时解决方案就好比当初MRC和ARC时候的解决办法,当初xcode5更新时候默认是工程创建是ARC的,你可以关闭ARC改为MRC,经过了一段时间后,大家都开始使用了ARC,那么bitcode也一样,在xcode7时候默认是开启的,我们需要关闭,那么如何关闭我引用了一篇文章的gif图来做演示在targets里面选择BuildSetting中搜索bitcode,然后改为no就ok了二、iOS9 https问题如果在Xcode 9之前使用的时http请求,那么在XCode 9上编译的App是不能联网的,会提示如下错误:App Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. Temporary exceptions can be configured via your app‘s Info.plist file.修 改方法是要么使服务器支持https访问,要么关闭https的使用。第一种方法对于个人开发者来说代价还是比较大的,因此推荐使用后面一种方法,具体的 做法是:在工程的Info.plist文件里添加NSAppTransportSecurity字典类型的,添加一个元素:key为 NSAllowsArbitraryLoads,值为YES。三、iOS 9 使用URL scheme必须将其加入白名单(摘抄)否则会提示类似如下错误:canOpenURL: failed for URL: "mopensdkapiV2://app" - error: "This app is not allowed to query for scheme mopensdkapiV2”修正方法是,Info.plist文件中添加一个key为LSApplicationQueriesSchemes的数组值,里面包含需要添加白名单的string类型的scheme。特酷吧在项目中使用了,微信等分享登录功能,需要添加的值为:mopensdkapiV2mOpensdkSSoLoginmmqzoneopensdkapiV2mqzoneopensdkapi19mqzoneopensdkapimqzoneopensdkmqzoneweixinwechat三、新浪微博的jsonkit在部分机型上面导致崩溃(群友Gemini提供问题是 程序会奔溃到jsonkit.m void keyObjectISA = ((void **)keys[idx]);这行代码,因为在os x10.10中,NSString采用了TaggedPointer这项技术,此类型不使用解应用isa来获取其所属类,而是通过接下来的三位来查找类表索引的类型,且对象指针最低位置为1。如何解决:解决方法由群友sun提供参考地址如下由于taggedpointer类型不能用isa了,就必须修改为object_getClass(keyObject) ,而且在line:2601处也需要做修改这里附一个修改过的jsonkit,可以正常使用四 、原来的dylib后缀名的库全部修改为libz.tbd五、报错 Assertion failure in -[UIApplication _runWithMainScene:transitionContext:completion:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3505.16/UIApplication.m:3294 (群友sun提供)在Info.plist中,可以找到:“Main storyboard file base name” String “Main”,删掉这个条目, 再启动,屏幕变成了黑屏手动添加window- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {// Override point for customization after application launch.self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; //全屏windowself.window.backgroundColor = [UIColor whiteColor]; //白色背景[self.window makeKeyAndVisible]; //return YES;}ok,这个由于更新xcode7报错已解决!如果按照上面修改完,发现还在报错,那么去看看你的项目是不是加了引导页把上面的add方法,变成下面的就好。这个add方法在xcode7之前是没有问题的,在xcode7后不能这样写了!六、找不到(丢失).dylib文件,换成.tbd文件而又无法运行,请用下面的方式来解决。Go to Build Phases >Link Binary with Librairies > + > Add otherOnce in the file selection window do "CMD"+Shift+G (Go to folder) and type /usr/lib/From /user/lib you can add: libz.dylib and more...Compile and have fun简书Xcode7的常见问题一.Xcode7,iOS9之后传出来的什么Xcode有鬼,被植入代码片段什么的,可以看看,了解一下二.bitcode问题--未正确设置可能导致编译问题。适配iOS91、大部分社交平台接口不支持https协议。问题描述:在iOS9下,系统默认会拦截对http协议接口的访问,因此无法获取http协议接口的数据。对ShareSDK来说,具体表现可能是,无法授权、分享、获取用户信息等。还可能造成我们的编辑界面里传http之类的网络图片的时候,我们的编辑界面不会显示图片截图,解决的办法或者全面关闭https,允许使用http请求;或者把图片的域添加;又或者选择使用https的图片解决方案(以下方法2选1):(1)、暂时退回到http协议。具体方法:在项目的info.plist中添加一个Key:NSAppTransportSecurity,类型为字典类型。然后给它添加一个Key:NSAllowsArbitraryLoads,类型为Boolean类型,值为YES;示例(2)、设置域。可以简单理解成,把不支持https协议的接口设置成http的接口。具体方法:1)、在项目的info.plist中添加一个Key:NSAppTransportSecurity,类型为字典类型。2)、然后给它添加一个NSExceptionDomains,类型为字典类型;3)、把需要的支持的域添加给NSExceptionDomains。其中域作为Key,类型为字典类型。4)、每个域下面需要设置3个属性:NSIncludesSubdomains、NSExceptionRequiresForwardSecrecy、NSExceptionAllowsInsecureHTTPLoads。均为Boolean类型,值分别为YES、NO、YES。示例2、大部分社交平台SDK不支持bitcode。问题描述:iOS 9新建项目默认需要支持bitcode,而不支持bitcode的SDK会导致无法编译运行。解决方案:(1)、暂时关闭对bitcode的支持(建议),方法如下图(2)、移除不支持bitcode的平台SDK。示例3、添加Scheme白名单问题描述:在iOS 9下涉及到平台客户端跳转,系统会自动到项目info.plist下检测是否设置平台Scheme。对于需要配置的平台,如果没有配置,就无法正常跳转平台客户端。因此要支持客户端的分享和授权等,需要配置Scheme名单。具体方法:1)、在项目的info.plist中添加一LSApplicationQueriesSchemes,类型为Array。2)、然后给它添加一个需要支持的项目,类型为字符串类型;示例三.ATS 未正确设置可能导致一些网络请求出问题。WWDC 2015上了解到iOS 9将要求网络请求使用HTTPS协议。我们知道,Apple在安全及用户隐私方面做了很多工作,包括沙盒机制、代码签名、禁用私有API等。而在今年6月份的WWDC 2015上,Apple又提出了App Transport Security(ATS)的概念。这一特性的主要意图是为我们的App与服务器之间提供一种安全的通信方式,以防止中间人窃听、篡改传输的数据。这一特性在iOS 9+和OS X 10.11+中是默认的支持项。这一概念的提出,也将意味着Apple将会慢慢转向支持HTTPS,而可能放弃HTTP。App Transport Security技术要求我们先来看看ATS的技术要求(参考App Transport Security Technote):1)The server must support at least Transport Layer Security (TLS) protocol version 1.2.2)Connection ciphers are limited to those that provide forward secrecy (see the list of ciphers below.)3)Certificates must be signed using a SHA256 or better signature hash algorithm, with either a 2048 bit or greater RSA key or a 256 bit or greater Elliptic-Curve (ECC) key.可以看到服务端必须支持TLS 1.2或以上版本;必须使用支持前向保密的密码;证书必须使用SHA-256或者更好的签名hash算法来签名,如果证书无效,则会导致连接失败。Apple认为这是目前保证通信安全性的最佳实践,特别是使用TLS 1.2和前向保密。当然,相信Apple也会与时俱进,不断的修正ATS,以保证网络通信的安全性。默认配置在iOS 9+和OS X 10.11+中,如果我们的App使用了NSURLConnection、CFURL 或者NSURLSession相关的API来进行数据通信的话,则默认是通过ATS的方式来传输数据。在此配置下,如果我们使用HTTP来进行通信,则会导致请求失败,并报以下错误:The resource could not be loaded because the App Transport Security policy requires the use of a secure connection.这样意味着如果使用ATS,将无法支持HTTP协议(我们测试了一下,由于我们的登录服务是使用HTTP协议,目前在iOS 9下已无法正常登录)。相信目前还有大量的应用是通过HTTP协议来访问服务器的。而要让所有的应用都转向支持HTTPS,显然是一件费时费力的事(与今年年头所有应用必须支持64位ARM不同,那次只是在客户端层面,而ATS涉及到服务端,影响面更大)。所以苹果提供了一种兼容方案,下面我们就来看看如何处理。自定义配置考虑到现实因素,我们可能并不想使用默认配置,或者至少需要一个过渡时期。为此,Apple允许我们在Info.plist文件中来自行配置以修改默认设置(Exceptions),下表是一些键值及对应的类型和说明:示例示例示例示例示例四.Scheme未正确设置可能导致应用程序间跳转会有问题同一中的白名单五.Requires full screen 未正确设置可能导致应用程序上传会失败 提示ITMS-90474 ITMS-90475
2023-07-07 23:53:271

Redis-Cluster

是一种去中心化的集群架构 Redis Cluster 的性能与单节点部署是同级别的。 多主节点、负载均衡、读写分离 Redis Cluster 支持标准的 主从复制配置来保障高可用和高可靠。 failover (故障转移) Redis Cluster 也实现了一个类似 Raft 的共识方式,来保障整个集群的可用性。 向 Redis Cluster 中添加新节点,或者移除节点,都是透明的,不需要停机。 水平、垂直方向都非常容易扩展。 数据分区,海量数据存储 部署 Redis Cluster 不需要其他的代理或者工具,而且 Redis Cluster 和单机 Redis 几乎完全兼 容。 角色: master、slave Redis Cluster 由多个Redis节点组构成,是一个P2P(point to point)无中心节点的集群架构,依靠Gossip协议传播集群 Gossip协议是一个通信协议,一种传播消息的方式。 思想启发于:病毒传播 这些收到信息的节点接下来会做同样的事情,即把这些信息传递给其他一些随机选择的节点。 信息会周期性的传递给N个目标节点。这个N被称为fanout(扇出) gossip协议包含多种消息,包括meet、ping、pong、fail、publish等等 通过gossip协议,cluster可以提供 集群间状态同步更新 、 选举自助failover 等重要的集群功能。 分布式架构设计中,核心问题即为如何分片数据。在技术的更替中出现过以下分布式hash算法: redis-cluster把所有的物理节点映射到[0-16383]个slot上,基本上采用平均分配和连续分配的方式。 slot槽必须在节点上连续分配,如果出现不连续的情况,则RedisCluster不能工作。 采用 raft 协议(参照Paxos算法 https://www.jianshu.com/p/40c658c9dcc2 ) 当slave 收到过半的master 同意时,会成为新的master。此时会以最新的Epoch 通过PONG 消息广播自己成为master,让Cluster 的其他节点尽快的更新拓扑结构(node.conf)。 就是上面讲的从节点选举 人工故障切换是预期的操作,而非发生了真正的故障,目的是以一种安全的方式(数据无丢失)将当前master节点和其中一个slave节点(执行cluster-failover的节点)交换角色 1、向从节点发送cluster failover 命令(slaveof no one) 2、从节点告知其主节点要进行手动切换(CLUSTERMSG_TYPE_MFSTART) 3、主节点会阻塞所有客户端命令的执行(10s) 4、从节点从主节点的ping包中获得主节点的复制偏移量 5、从节点复制达到偏移量,发起选举、统计选票、赢得选举、升级为主节点并更新配置 6、切换完成后,原主节点向所有客户端发送moved指令重定向到新的主节点 以上是在主节点在线情况下。 如果主节点下线了,则采用cluster failover force或cluster failover takeover 进行强制切换。 扩容 扩容节点数据必须为空 缩容 只能删除数据为空的节点 我们知道在一主一从的情况下,如果主从同时挂了,那整个集群就挂了。 为了避免这种情况我们可以做一主多从,但这样成本就增加了。 Redis提供了一种方法叫副本漂移,这种方法既能提高集群的可靠性又不用增加太多的从机。 Master1宕机,则Slaver11提升为新的Master1 集群检测到新的Master1是单点的(无从机) 集群从拥有最多的从机的节点组(Master3)中,选择节点名称字母顺序最小的从机(Slaver31)漂移 到单点的主从节点组(Master1)。 具体流程如下(以上图为例): 1、将Slaver31的从机记录从Master3中删除 2、将Slaver31的的主机改为Master1 3、在Master1中添加Slaver31为从节点 4、将Slaver31的复制源改为Master1 5、通过ping包将信息同步到集群的其他节点
2023-07-07 23:53:251