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Impala 表使用 RCFile 文件格式(翻译)

旧时模样 提交于 2019-12-01 19:56:40
Impala 表使用 RCFile 文件格式 Cloudera Impala 支持使用 RCFile 数据文件。 查询一下章节了解 Impala 表使用 RCFile 数据文件的详情: 创建RCFile 表并加载数据 RCFile 表启用压缩 创建 RCFile 表并加载数据 假如你没有使用现有的数据文件,先创建一个合适格式的文件。 创建 RCFile 表: 在 impala-shell 中,执行类似下面的命令: create table rcfile_table (column_specs) stored as rcfile; 因为 Impala 可以查询一些目前它无法写入数据的表,当创建特定格式的表之后,你可能需要在 Hive shell 中加载数据。参见 Impala 如何使用 Hadoop 文件格式 了解详细信息。当通过 Hive 或其他 Impala 之外的机制加载数据之后,在你下次连接到 Impala 节点时,在执行关于这个表的查询之前,执行 REFRESH table_name 语句,以确保 Impala 识别到新添加的数据。 例如,下面是你如何在 Impala 中创建 RCFile 表(通过显式设置列,或者克隆其他表的结构),通过 Hive 加载数据,并通过 Impala 查询: $ impala-shell -i localhost [localhost

Impala 表使用 SequenceFile 文件格式(翻译)

白昼怎懂夜的黑 提交于 2019-12-01 19:56:26
Impala 表 使用 SequenceFile 文件格式 Cloudera Impala 支持使用 SequenceFile 数据文件。 参加以下章节了解 Impala 表使用 SequenceFile 数据文件的详情: 创建 SequenceFile 表并加载数据 SequenceFile 表启用压缩 创建 SequenceFile 表并加载数据 假如你没有使用已有的数据文件,请先创建一个合适格式的文件。 创建 SequenceFile 表: 在 impala-shell 中,执行类似命令: create table sequencefile_table (column_specs) stored as sequencefile; 因为 Impala 可以查询一些目前它无法写入数据的表,当创建特定格式的表之后,你可能需要在 Hive shell 中加载数据。参见 Impala 如何使用 Hadoop 文件格式 了解详细信息。当通过 Hive 或其他 Impala 之外的机制加载数据之后,在你下次连接到 Impala 节点时,在执行关于这个表的查询之前,执行 REFRESH table_name 语句,以确保 Impala 识别到新添加的数据。 例如,下面是你如何在 Impala 中创建 SequenceFile 表( 通过显式设置列,或者克隆其他表的结构 ),通过 Hive

MySQL主主同步方案

不羁的心 提交于 2019-12-01 19:52:19
MySQL 主主同步方案 l MySQL 主主 +Keepalived l MySQL+DRBD+Heartbeat 在企业中,数据库高可用一直是企业的重中之重,中小企业很多都是使用 mysql 主 主 方案,一主多从,读写分离等,但是单主存在单点故障,从库切换成主库需要作改动。因此,如果是双主或者多主,就会增加 mysql 入口,增加高可用。 不过多主需要考虑自增长 ID 问题,这个需要特别设置配置文件,比如双主,可以使用奇偶 ,总之,主之间设置自增长 ID 相互不冲突就能完美解决自增长 ID 冲突问题。 主主方案实现思路 1、 两台 mysql 都可读写,互为主备 。 默认只使用一台 masterA 负责数据的写入,另一台 masterB 备用 处于备用状态 ; 2、 masterA 是 masterB 的主库, masterB 又是 masterA 的主库,它们互为主从; 3、 两台主库之间做高可用 , 可以采用 keepalived 等方案 , 使用 VIP 对外提供服务; 4、 所有提供服务的从服务器与 masterB 进行主从同步(双主多从) ; 5、 建议采用高可用策略的时候, masterA 或 masterB 均不因宕机恢复后而抢占 VIP (非抢占模式); 这样做可以在一定程度上保证主库的高可用 , 在一台主库 down 掉之后 ,

How to save an uploaded file on localhost?

孤街浪徒 提交于 2019-12-01 19:27:03
问题 I have been using to upload an image file from HTML5/JS and using PHP script to save it in localhost(/var/www/) but i cant save it. the function move_uploaded_file always returns false while there is exists an object in _FILES object. I am a newbie in php: $target = "upload/"; if(!empty($_FILES)) { if(move_uploaded_file($_FILES['image_file']['tmp_name'], $target)) { echo "The file ". basename( $_FILES['image_file']['name']). " has been uploaded..."; } else { echo "Sorry, there was a problem

Xcode error: failed to launch [directory] — invalid host string: 'localhost'

一曲冷凌霜 提交于 2019-12-01 18:55:06
I am trying to run in command line tool the following code: #import <Foundation/Foundation.h> int main(int argc, const char * argv[]) { @autoreleasepool { // insert code here... NSLog(@"Hello, World!"); } return 0; } and after "Build Succeeded" I am getting the following error: error: failed to launch '/Users/dimitrisagagiotis/Library/Developer/Xcode/DerivedData/test-guvgymeaqzlsheascqbmllxdtpsn/Build/Products/Debug/test' -- invalid host string: 'localhost' any solution??? Thank you I had the same issue and resolved it with the following steps. You have to verify that the following lines are

Access localhost from another computer not on network

大城市里の小女人 提交于 2019-12-01 18:30:20
Before you say that it is a dupe, this is not the same as this , this , this or this . My question is how do you do it globally. For instance, consider this. I have EasyPHP running in my computer. At present my ip address (global) is 223.231.178.118 Now, let's say there is someone else (maybe in a different country altogether) who wants to access my ip (223.231.178.118). I do know how to access 192.168.x.x from the same network. I just want to know how you can do this globally, if possible. P.S 1 : The computer running EasyPHP is behind a router. P.S 2 : My IP (local IP is, but global one is

How do I use Fiddler to listen to the asp.net development server (i.e. cassini)?

六眼飞鱼酱① 提交于 2019-12-01 18:30:20
问题 I am attempting to debug a (RESTful) WCF app using Fiddler. I run my project via VS IDE - which launches my app in the ASP.NET Development Server aka Cassini. I then launch Fiddler and in the Request Builder tab enter the following: "http://localhost:1066/GeneralService/sections/summary" with GET as the http method. Fiddler responds with "[Fiddler] Connection to localhost failed. Exception Text: No connection could be made because the target machine actively refused it ::1:1066 " Is there

Unable to bind local host:8000 with Google App Engine

主宰稳场 提交于 2019-12-01 18:23:25
I am trying to run a Python app in Google App Engine. The UI doesn't work so I tried using the command lines. I tried restarting my PC, I tried changing port with "dev_appserver.py --port=9999 ." but it still says Unable to bind localhost:8000 : raise BindError('Unable to bind %s:%s' % self.bind_addr) google.appengine.tools.devappserver2.wsgi_server.BindError: Unable to bind localhost:8000 The app server starts two servers; one for your application, the other for the development console . It is that second server that is causing the problem here; it normally would be run on port 8000. Change

How do I use Fiddler to listen to the asp.net development server (i.e. cassini)?

时光怂恿深爱的人放手 提交于 2019-12-01 18:18:41
I am attempting to debug a (RESTful) WCF app using Fiddler. I run my project via VS IDE - which launches my app in the ASP.NET Development Server aka Cassini. I then launch Fiddler and in the Request Builder tab enter the following: " http://localhost:1066/GeneralService/sections/summary " with GET as the http method. Fiddler responds with "[Fiddler] Connection to localhost failed. Exception Text: No connection could be made because the target machine actively refused it ::1:1066 " Is there some way for me to debug an app running on Cassini? Thanks, Steve Change the url to http://ipv4.fiddler

mail function is not working in localhost server

﹥>﹥吖頭↗ 提交于 2019-12-01 18:16:22
I am on my localhost server. I am using this code below, but I never received the email. <?php $to = "someone@example.com"; $subject = "Test mail"; $message = "Hello! This is a simple email message."; $from = "someonelse@example.com"; $headers = "From:" . $from; mail($to,$subject,$message,$headers); echo "Mail Sent."; ?> I know its kinda late... check if your localhost is configured to send email On ubuntu terminal try executing following command # apt-get install sendmail Johannes Mittendorfer Make sure that the mailserver is configured correctly in the php.ini file. comment out these lines