hadoop prerequisites

client request is received on a specific IP address/port combination and the IP address is not configured to listen on that particular port, IIS returns a 404.1 HTTP error. For example, if a computer has two IP addresses and only one of the IP addresses is configured to listen on port 80, any requests received from port 80 by another IP address will cause IIS to return 404.1 errors. This error should only be set at this service level because it is returned to the client only when multiple IP ad

" : "zhangsan" }{ "_id" : ObjectId("5b4eb96759122739e2695614"), "id" : 2, "name" : "lisi" }mongos> db.test.remove({"id":1}) #删除test集合中的id为1的数据WriteResult({ "nRemoved" : 1 })mongos> db.test.find(){ "_id" : ObjectId("5b4eb96759122739e2695614"), "id" : 2, "name" : "lisi" }mongos> db.test.update({"id":2},{$set:{"name":"wangwu"}}) #修改数据WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })mongos> db.test.find(){ "_id" : ObjectId("5b4eb96759122739e2695614"), "id" : 2, "name" : "wa

, to see the status of a process. pid of the kill-9 process : Kill Process (-9 indicates forced termination.) Use PS to find the process, and then kill it with kill network communication command: View current system NIC information: Ifconfig View connection to a machine: pin G To view the port usage for the current system: Netstat-an shutdown : shutdown-h now : Specify to shut down now immediately; shutdown +5 "System will shutdown after

Label:The prerequisites are:Please check with the application developer and OPS staff for confirmation:First: Whether the Windows Database server has an application that has fetching (or extracting data). If so, the application software that needs to ask for a number (or extract data) has a corresponding version in Linux.Second: The window database server hardware interface (USB, the port and so on) whether the dongle or the like. If there is, you nee

master values (Master_seq.nextval, ' John Doe ')--View the current and next values of the sequenceSelect Master_seq.currval from dualSelect Master_seq.nextval from dual--Add comments to the master tableComment on table master is ' pet 'Comment on column master.id is ' master ID ' 、、、、、、、、、、、、、、、、、、、 add constraints to the table 、、、、、、、、、、、、、、、 There are several major categories of Oracle-built constraints:Nn:not NULL non-null constraintUk:unique KEY UNIQUE ConstraintPk:primary Key PRIMARY KEY

Download Laravel FrameworkComposer Create-project Laravel/laravel project name Version nameExample: Composer Create-project Laravel/laravel HomeNet 5.0Create a project named HomeNet, the Laravel framework version is 5.0Composer Create-project Laravel/laravel--prefer-distLatest VersionNginx/usr/local/nginx/conf/vhost Add conf fileAdd a method: Under any directory, add conf file (Root permission) Lnmp vhost addFor example, add a domain name of test.comModify configuration file VI test.com.confModi

Maps, Opensnoop for Linux,execsnoop for Linux, Tcpretrans, Page Cache hit Ratio (2014). Posts about perf-based Perf-tools:perf Hacktogram. Posts about Perf_events:perf CPUs sampling, perf Static tracepoints, perf Heat Maps, perf counting, perf Kernel line Traci Ng, perf off-cpu time Flame Graphs, Linux Profiling at Netflix (2014-5). The blog post strace Wow Much Syscall discusses strace (1) for production use, and compares it to advanced tracing tools (2 014). Use Method:linux perfo

different complex algorithms and code optimization, to achieve the readability of the code.10. Find a few friends to talk about a different way of achieving the need to see who has the best opinion in this respect.Here are some specific points of knowledge that a person can understand about C/O:1. Choose a development platform that you can understand.2. Use English;3. Learn how to use printf, and note that the parameters are separated by commas (at least a Hello world is written);4. Use%d to pr

Configuration tool.The appropriate configuration for Samba is done through the graphical interface:1) Add user2) set up the Linux shared directory and its permissions3. Test use1) If a Windows host wants to access Ubuntu's shared directory, the network of both systems must be able to be flat, otherwise, inaccessible, for Ubuntu to flat Windows IP:2) Get the Ubuntu IP, knocking at the terminal: Ifconfig.3) access to the Samba shared directory, operating in the Windows Host: Start-up and run-->\\

. The difference between a thread and a process: Dispatch: A thread acts as the basic unit of dispatch and allocation, and processes as the basic unit of resources. Concurrency: Not only can concurrent execution between processes, but also concurrent execution between multiple threads of the same process. Owning a resource: a process is an independent unit that owns resources, and threads do not own system resources, but can access resources that belong to the process.

Have heard many webmaster complained that they have submitted the site to a number of Web site directory, but there are few, as for why they can not say clearly, in fact, this problem is a lot of webmaster will encounter, not every one of us to submit a directory site will be included, and no matter to which platform can publish their own site links , these must be fastidious, otherwise the network promotion is not messed up. Below to push the network to talk with you about the site Directory of

", "username", "password") or Die ("Cannot connect to MySQLServer"); $query = " SELECT * from MyTable "; $result = Mysql_db_query (" MyDatabase ", $query); mysql_close (); Description: To make the code clear, it is not recommended to use this function call 7, Mysql_ Result ()-Gets and displays data format: Mixed mysql_result (Resource result_set, int row [, mixed field]) Example: $query = "SELECT ID, name from Mytab Le order by name ", $result = mysql_query ($query); for ($count =0; $count Chang

Workaround:1. At the command prompt, net share c$=c:Add:If this command prompts the error: "System error 5, Access denied," We can modify the registry, check the AutoShareServer and AutoShareWks registry values to ensure that they are not set to 0, and let the C drive share.Steps:1. Tap start → run, enter regedit, and press ENTER to enter the Registry Editor.2. Locate and click Hkey_local_machine-->system-->currentcontrolset-->services-->lanmanserver-->parameters, Change the value of AutoShareSe

Tags: selected round post back SEL bracket Code Auto MarkdownSeveral times recently left the seat that I had been sitting in, went to another computer room examination.Then suddenly remembered to remember the simple configuration of Emacs.The Noip of the remnants of the memory to pick up a little more ...Attach some explanations(global-set-key [f9] ‘compile-file);;一键编译（弄Devcpp留下来的习惯）(global-set-key (kbd "C-z") ‘undo);;一键撤销（Like Windows）(global-set-key (kbd "C-q") ‘kill-this-buffer);;一键关闭;;（蒟蒻总是搞

addition of an element to the list, the ID exists to update the specified element*/Province="Luanxian", City="111 Hunan Occupation Master", District="Community", Seconds=1}, Addlist=NewList() { NewAddress {/*no ID (or ID not present in the collection) is the addition of an element to the list, the ID exists to update the specified element*/Id="556d531e2683c818c86cadde", Province="Luanxian", City="Hunan occupies master ddd", District="Community", Seconds=1

WebAPI prerequisites: HTTP, RestfulAPI, and webapirestfulapi The basic understanding of the HTTP protocol is the basis for understanding and using RestFul APIs. After understanding these basics, you can use various RestFul development frameworks. When I first started using webapis, I had a lack of understanding of these knowledge and felt that they were not easy to use. I didn't feel comfortable using webapis until I became familiar with these HTTP kn

Introduction to the prerequisites and principles for generating HTML in PHP. Many websites have begun to use the author's website to use the dynamic PHP technology to build a news publishing system. The principle is to use PHP to generate HTML static pages, many websites are using related platforms. My website used the dynamic PHP technology to build a news publishing system. The principle is to use the PHP technology to generate HTML static pages, t

, sorts the same values next to each other, and then iterates through the array with only the values that do not duplicate the previous value. // next to the same value, and then traverse to remove duplicate values function unique4 (array) { array.sort (); var re=[array[0]]; for (var i = 1; i ) { if(Array[i]!== re[re.length-1]) { re.push (array[i]); } } return re;}5. Optimized traversal Array Method foreign blog implementation Ideas : Gets the right-most value

The following articles mainly refer to the definition of MYSQL Foreign keys and the prerequisites for establishing MYSQL Foreign keys, that is, the related columns of the table must belong to the same type as the foreign key (the foreign key must be the external primary key. We all know that foreign keys are used to associate two tables. Foreign keys can only reference the values of columns in the External table! Specify the primary key Keyword: fore

-windows.github.io/3. You can then execute the go get github.com/go-sql-driver/mysql command to install a third-party package. This command will extract the class library package source code, download it into your%gopath% path,For example: D:\go\gopath\ src\github.com\go-sql-driver\mysqlThe front is the Gopath path, followed by the class library, and it also executes go install XXX, generating a package path such as D:\go\gopath\pkg\xxxx. 4. Import the downloaded third-party package in your code