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  • How to learn using Hadoop

    - by ajay
    hi, I want to learn hadoop. However, I don't have access to a cluster now. Is it possible for me to learn it and use it for writing programs and learn it properly. Would it be helpful to run multiple linux VMs and then use them as boxes to run hadoop? Or you think that is more of a stretch and running it on a multiple hosts is the same as running in on single host (in terms of setup, Hadoop API used, the architecture of the map-reduce programs etc) Thanks,

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  • Internet Access in Ubuntu on VirtualBox

    - by Joel Martinez
    I recently installed Ubuntu on a VirtualBox VM ... it installed just fine (much easier than on VirtualPC). However, I'm unable to get internet access from the guest OS (ie. Ubuntu). Can anyone give me any pointers on how I might enable this? The Host OS is Windows Vista, and the hardware is an IBM Lenovo. Thanks! :-)

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  • Where are run the Opengl commands?

    - by Lucas
    Hi, i'm programming a simple OpenGL program on a multi-core computer that has a GPU. The GPU is a simple GeForce with PhysX, CUDA and OpenGL 2.1 support. When i run this program, is the host CPU that executes OpenGL specific commands or the ones are directly transferred to the GPU ???

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  • Why does firefox round-trip to the server to determine whether my files are modifed?

    - by erikkallen
    I have some static content on my web site that I have set up caching for (using Asp.NET MVC). According to Firebug, the first time I open the page, Firefox sends this request: GET /CoreContent/Core.css?asm=0.7.3614.34951 Host: 127.0.0.1:3916 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729) Accept: text/css,*/*;q=0.1 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive Referer: http://127.0.0.1:3916/Edit/1/101 Cookie: .ASPXAUTH=52312E5A802C1A079E2BA29AA2BFBC5A38058977B84452D62ED52855D4164659B4307661EC73A307BFFB2ED3871C67CB3A9AAFDB3A75A99AC0A21C63A6AADE9A11A7138C672E75125D9FF3EFFBD9BF62 Pragma: no-cache Cache-Control: no-cache Which my server replies to with this: Server: ASP.NET Development Server/9.0.0.0 Date: Mon, 23 Nov 2009 18:44:41 GMT X-AspNet-Version: 2.0.50727 X-AspNetMvc-Version: 1.0 Cache-Control: public, max-age=31535671 Expires: Tue, 23 Nov 2010 18:39:12 GMT Last-Modified: Mon, 23 Nov 2009 18:39:12 GMT Vary: * Content-Type: text/css Content-Length: 15006 Connection: Close So far, so good. However, if I refresh Firefox (not a cache-clearing refresh, just a normal one), during that refresh cycle Firefox will once again go to the server with this request: GET /CoreContent/Core.css?asm=0.7.3614.34951 Host: 127.0.0.1:3916 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729) Accept: text/css,*/*;q=0.1 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive Referer: http://127.0.0.1:3916/Edit/1/101 Cookie: .ASPXAUTH=52312E5A802C1A079E2BA29AA2BFBC5A38058977B84452D62ED52855D4164659B4307661EC73A307BFFB2ED3871C67CB3A9AAFDB3A75A99AC0A21C63A6AADE9A11A7138C672E75125D9FF3EFFBD9BF62 If-Modified-Since: Mon, 23 Nov 2009 18:39:20 GMT Cache-Control: max-age=0 to which my server responds 304 Not Modified. Why does Firefox issue this second request? In the first response, I said that the cache does not expire for a year (I intend to use query parameters whenever things change). Do I have to add another response header to prevent this extra roundtrip? Edit: It does not matter whether I press refresh, or whether I go to the page again (or a different URL, which references the same external files). Firefox does the same again. Also, I don't claim this to be a bug in FF, I just wonder if there is another header I can set which means "This document will never change, don't bother me again".

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  • C++ undefined reference

    - by klaus-johan
    Hi , My problem is the following : I have a class A that inherits from an abstract base class. I override all the virtual functions from the base class, and I have a constructor like this : A::A(B* b) { this->b=b; } In the constructor of class B , I have the following piece of code: A* a=new A(this) However this line of code gives the error : undefined reference to 'A::A(B*)' I have absolutly no idea why could this be happening , so any suggestion would be greatly appreciated !

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  • IIS7 Itegrated Pipeline Mode: Context.User is intermittently null for Windows Auth

    - by AndyV
    Our code relies on checking the Context.User.Identity value in the Global.asax Application_AuthenticateRequest(...) method to retrieve some information about the logged in user. This works fine in classic mode but when I flip IIS to use the Integrated Pipeline "Context.User" comes back as null, but only intermittently. Any ideas why? I have < authentication mode="Windows" and only Windows Auth enabled in the Virtual Directory.

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  • Comparing a peer's IPv6 address with localhost

    - by indiv
    I have called getpeername on my connected socket and now have an IPv6 address of the connected peer. How do I tell whether my peer's IP address is localhost? (the host name "localhost" is not defined in the target system's hosts file, so I need to work with IP addresses only)

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  • Check server response in javascript.

    - by Mujtaba Hassan
    I want to check server response in javascript. For example I have a server A which will host the script. On excuting the script it will check if the server B is responding or not. If yest continue other wise redirect to server C. Is this possible with Javascript/Jquery? If not what could be a possible solution in PHP?

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  • Show a DB as a directory (Like Sharepoint Does)

    - by Zyd
    Hi, My team and I are programming a sort of Document Manager and the idea is to store them completely on DB. Is there a protocol or Extensions that allows us to show a "Virtual Directory" or files that are really non existent (only in DB). How does Sharepoint do this? I understand that Sharepoint uses WebDav but it implies that the files do exist physically somewhere. We intend to develop this application on .NET 4.0 and deploy it on IIS. Any suggestions? Thanks in advance

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  • Server Error Message: No File Access

    - by iMayne
    Hello. Im having an issues but dont know where to solve it. My template works great in xampp but not on the host server. I get this message: Warning: file_get_contents() [function.file-get-contents]: URL file-access is disables in the server configuration in homepage/......./twitter.php. The error is on line 64. <?php /* For use in the "Parse Twitter Feeds" code below */ define("SECOND", 1); define("MINUTE", 60 * SECOND); define("HOUR", 60 * MINUTE); define("DAY", 24 * HOUR); define("MONTH", 30 * DAY); function relativeTime($time) { $delta = time() - $time; if ($delta < 2 * MINUTE) { return "1 min ago"; } if ($delta < 45 * MINUTE) { return floor($delta / MINUTE) . " min ago"; } if ($delta < 90 * MINUTE) { return "1 hour ago"; } if ($delta < 24 * HOUR) { return floor($delta / HOUR) . " hours ago"; } if ($delta < 48 * HOUR) { return "yesterday"; } if ($delta < 30 * DAY) { return floor($delta / DAY) . " days ago"; } if ($delta < 12 * MONTH) { $months = floor($delta / DAY / 30); return $months <= 1 ? "1 month ago" : $months . " months ago"; } else { $years = floor($delta / DAY / 365); return $years <= 1 ? "1 year ago" : $years . " years ago"; } } /* Parse Twitter Feeds */ function parse_cache_feed($usernames, $limit, $type) { $username_for_feed = str_replace(" ", "+OR+from%3A", $usernames); $feed = "http://twitter.com/statuses/user_timeline.atom?screen_name=" . $username_for_feed . "&count=" . $limit; $usernames_for_file = str_replace(" ", "-", $usernames); $cache_file = dirname(__FILE__).'/cache/' . $usernames_for_file . '-twitter-cache-' . $type; if (file_exists($cache_file)) { $last = filemtime($cache_file); } $now = time(); $interval = 600; // ten minutes // check the cache file if ( !$last || (( $now - $last ) > $interval) ) { // cache file doesn't exist, or is old, so refresh it $cache_rss = file_get_contents($feed); (this is line 64) Any help on how to give this access on my host server?

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  • Why is my Android emulator keyboard in Japanese character mode?

    - by mckoss
    I'm debugging my Android application using the AVD (Android Virtual Device). When I try to enter text in a text field, my characters are being interpreted as Japanese (or Chinese?) in the IME. I don't know how I got into this mode or how to get out of it (I just want to enter alphabetic keys)? Here's a screen shot: http://u.go2.me/3cn

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  • sql server 2008 takes alot of memory?

    - by Ahmed Said
    I making stress test on my database which is hosted on sqlserver 2008 64bit running on 64bit machine 10 GB of RAM. I have 400 threads each thread query the database for every second but the query time does not take time as the sql profiler says that, but after 18 hours sql takes 7.2 GB RAM and 7.2 on virtual memroy. Does is this normal behavior? and how can I adjust sql to clean up not in use memory?

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  • Why is my PowerShell multi dimensional array being interpreted as a 1 dimensional array?

    - by Jim
    I have the following code: function HideTemplates($File, $Templates) { foreach ($Template in $Templates) { Write-Host $Template[0] $Template[1] $Template[2] } } HideTemplates "test.xml" @(("one", "two", "three")) HideTemplates "test.xml" @(("four", "five", "six"), ("seven", "eight", "nine")) It prints: o n e t w o t h r four five six seven eight nine I want it to print: one two three four five six seven eight nine Am I doing something wrong in my code? Is there a way to force PowerShell to tread a multi-dimensional array with a single item differently?

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  • Upgrading to ASP.NET 3.5

    - by rs
    I have a server with some asp, asp.net 1.0 and 2.0 running on them. Now I'm planning to host 3.5 apps on them. Do i have to make any changes to server other than installing framework to make it handle all my previous version apps? Do i have to install new IIS or i can use same iis for 3.5? Do i have to install ajax newer version to suport ajax 3.5?

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  • How do I get the CPU speed and total physical ram in C#?

    - by edude05
    I need a simple way of checking how much ram and fast the CPU of the host PC is. I tried WMI however the code I'm using private long getCPU() { ManagementClass mObject = new ManagementClass("Win32_Processor"); mObject.Get(); return (long)mObject.Properties["MaxClockSpeed"].Value; } Throws a null reference exception. Furthermore, WMI queries are a bit slow and I need to make a few to get all the specs. Is there a better way?

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  • how to use asadmin deploy for Sun Application Server Plaform Edition 9.1?

    - by dfdfd
    I try to use the command so that i can schedule the deployment using cron trigger. But however i been encountering this error. java.io.IOException: Remote host closed connection during handshake What could be the reason and how do i resolve it? Is it something to do with the port i define? I defined the port used in the admin-server system. As for secure i set to true.

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  • Multi-tier applications using L2S, WCF and Base Class

    - by Gena Verdel
    Hi all. One day I decided to build this nice multi-tier application using L2S and WCF. The simplified model is : DataBase-L2S-Wrapper(DTO)-Client Application. The communication between Client and Database is achieved by using Data Transfer Objects which contain entity objects as their properties. abstract public class BaseObject { public virtual IccSystem.iccObjectTypes ObjectICC_Type { get { return IccSystem.iccObjectTypes.unknownType; } } [global::System.Data.Linq.Mapping.ColumnAttribute(Storage = "_ID", AutoSync = AutoSync.OnInsert, DbType = "BigInt NOT NULL IDENTITY", IsPrimaryKey = true, IsDbGenerated = true)] [global::System.Runtime.Serialization.DataMemberAttribute(Order = 1)] public virtual long ID { //get; //set; get { return _ID; } set { _ID = value; } } } [DataContract] public class BaseObjectWrapper<T> where T : BaseObject { #region Fields private T _DBObject; #endregion #region Properties [DataMember] public T Entity { get { return _DBObject; } set { _DBObject = value; } } #endregion } Pretty simple, isn't it?. Here's the catch. Each one of the mapped classes contains ID property itself so I decided to override it like this [global::System.Data.Linq.Mapping.TableAttribute(Name="dbo.Divisions")] [global::System.Runtime.Serialization.DataContractAttribute()] public partial class Division : INotifyPropertyChanging, INotifyPropertyChanged { [global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_ID", AutoSync=AutoSync.OnInsert, DbType="BigInt NOT NULL IDENTITY", IsPrimaryKey=true, IsDbGenerated=true)] [global::System.Runtime.Serialization.DataMemberAttribute(Order=1)] public override long ID { get { return this._ID; } set { if ((this._ID != value)) { this.OnIDChanging(value); this.SendPropertyChanging(); this._ID = value; this.SendPropertyChanged("ID"); this.OnIDChanged(); } } } } Wrapper for division is pretty straightforward as well: public class DivisionWrapper : BaseObjectWrapper<Division> { } It worked pretty well as long as I kept ID values at mapped class and its BaseObject class the same(that's not very good approach, I know, but still) but then this happened: private CentralDC _dc; public bool UpdateDivision(ref DivisionWrapper division) { DivisionWrapper tempWrapper = division; if (division.Entity == null) { return false; } try { Table<Division> table = _dc.Divisions; var q = table.Where(o => o.ID == tempWrapper.Entity.ID); if (q.Count() == 0) { division.Entity._errorMessage = "Unable to locate entity with id " + division.Entity.ID.ToString(); return false; } var realEntity = q.First(); realEntity = division.Entity; _dc.SubmitChanges(); return true; } catch (Exception ex) { division.Entity._errorMessage = ex.Message; return false; } } When trying to enumerate over the in-memory query the following exception occurred: Class member BaseObject.ID is unmapped. Although I'm stating the type and overriding the ID property L2S fails to work. Any suggestions?

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  • django deployment apache

    - by Uszy Wieloryba
    I would like to create a python script, which will: Create a django project in the current directory. Fix settings.py, urls.py. Do syncdb Install new apache instance listening on specific port (command line argument), with WSGI configured to serve my project. I can't figure out how to do point 3. EDIT: Peter Rowell: I need the solution for both Linux and Windows I have root access This is a dedicated host Apache only

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  • can you deploy cruise control .net as a web service/web app?

    - by Maslow
    I'm investigating the possibility of utilizing my web host as a cruise control.net build server. If I have access to MsBuild or can deploy msBuild and run it, it would be great. I can not however find any resources that would tell me if cruise control supports being run as a web service or web app. Is this type of deployment possible? If not could the UI (it's web-based I believe) control section sit on the web server and send requests to the actual build server?

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  • Extending Eclipse product (parallel developments on a set of codes)

    - by zeroin23
    A spawn off of an existing eclipse product is required for customization for a client. (hence parallel product development) The intention was to use Eclipse Fragment, but "Fragments are additive, they cannot override content found in the host." how can we maintain one set of codes in the svn, yet allow customization by overriding some classes? the current solution is to have a global flag to indicated which product it is and "if" "else" littered everywhere in the codes ...

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  • DotNetNuke create new portal didnt create new portal

    - by Jonesy
    hi folks, I've installed dotnetnuke today for the first time, I've created a new portal via host/portals. It says its created it but just doesn't find it. I just don't know how/why? The portal ID is 4. and there is a directory in dotnetnuke/Portals/4 But the url localhost/bmd (name of the portal) doesn't resolve to anything/ Anyone know a solution to this? maybe it happened to you too? Cheers

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  • WCF data service hosting in Windows Form

    - by user158598
    Hi, I want to host a WCF Data Service (formerly known as ADO.NET data Service) in windows form.Is it possible? If yes,then is there any blog, which talks about it? I know WCF can be hosted in Windows Form, but I am not sure about WCF data service, as all the examples I see, is asking to create ASP.NET web project. -Brajesh

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