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• How does Hadoop perform input splits?

  - by Deepak Konidena

  Hi, This is a conceptual question involving Hadoop/HDFS. Lets say you have a file containing 1 billion lines. And for the sake of simplicity, lets consider that each line is of the form <k,v> where k is the offset of the line from the beginning and value is the content of the line. Now, when we say that we want to run N map tasks, does the framework split the input file into N splits and run each map task on that split? or do we have to write a partitioning function that does the N splits and run each map task on the split generated? All i want to know is, whether the splits are done internally or do we have to split the data manually? More specifically, each time the map() function is called what are its Key key and Value val parameters? Thanks, Deepak

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• In Ubuntu, where is the Thunderbird 3 installation folder?

  - by Delirium tremens

  I made a shortcut to the file that I used to install and run Thunderbird, but the shortcut looks weird. Where is the file that is used to run, but not install Thunderbird?

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• Capturing wirelss traffic (using Wireshark).

  - by Daisetsu

  When I run wireshark on a wired network it works fine and reports all of the packets. When I run it on a wireless network though I only see my own traffic. The wireless card I have is supposed to support packet capture and go into premiscous mode, but I don't see any other system traffic. What is wrong?

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• Copying Windows 7 system onto Mac Pro partition?

  - by BEATFROMBRAIN

  Instead of installing a new Windows 7 system onto a mac pro partition, is it possible to copy over my complete Windows 7 system directly onto the partition, and get it to run? I just bought the mac pro, and it's running OSX 10.6... Copied from a comment: I wish to make a windows partition on the mac pro startup disk, but instead of installing windows, was wondering if I can copy over from my pc laptop byte for byte my windows system into said partition, and successfully run it

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• Java: "Could not find the main class. Program will exit"

  - by AJ

  I'm trying to run SQuirreL SQL. I've downloaded it and installed it, but when I try to run it I get this error message: Java Virtual Machine Launcher. Could not find the main class. Program will exit. I get the gist of this, but I have not idea how to fix it. Any help? more info: I'm on Windows XP pro. I have java 1.6 installed, and other apps are running OK. The install ran OK. I believe I've followed the installation instructions correctly. To run it, I'm invoking the squirrel-sql.bat file. Update This question: http://stackoverflow.com/questions/1417328/could-not-find-the-main-class gives some background on this error from the point of view of a java developer.

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• Modifing settings in Django

  - by Cato Johnston

  I'm trying to get Django's manage.py to run with modified settings files. I have three settings files settings.py preview.py live.py settings.py contains my base settings but on live & preview sites I point the ['DJANGO_SETTINGS_MODULE'] to live or preview which in turn load the base file and any settings specific to that environment. This works fine, until I try to run migrations using manage.py I updated the manage.py file to import settings.preview but now when I try to run syncdb or migrate I get this error: django.core.exceptions.ImproperlyConfigured: You haven't set the DATABASE_ENGINE setting yet. My settings file has this in it though: DATABASE_ENGINE = 'mysql' How can I get this to work?

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• Install virtualization software on a remote linux machine as a non-root user

  - by Cetin Sert

  Hi, 1) Is there a way for me to install VirtualBox as a non root user? I compiled it from the sources but cannot find a way to load the kernel modules it requires? Is there anyway to make it run? 2) Is there any other virtualization software you have ever installed on linux successfully as a non root user, VMWare, Parallels, etc.? The aim is to run Windows as a virtual machine with more than 16GB RAM. Bests, Cetin

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• Java Applet in JAR File

  - by Jared Revik

  I have created a java applet (.class file) and made a .jar with it and digitally signed the .jar file. Now I need to run the .jar as an applet in firefox. What do I put in the html code to run the .jar file as an applet? I tried and it doesn't work, it tries to get a .class file, how do I load and run my applet as a .jar file using the applet tag in Internet Explorer and Firefox? I searched on the internet and could not find an answer.

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• Access Violation Exception only appearing when running C# app without debugger attached

  - by Jon

  I have an application that works fine in Visual Studios 2008, and I am trying to get it into VS 2010 in order to use .NET 4, and I have a really weird problem. When I run the code from either Release mode or Debug mode with the debugger attached (F5), I have no problems running the program. However, when I run the program from either Release or Debug without the debugger attached (Shift+F5), I get an Access Violation Exception when I attempt to run some code in a dll from GDCM. I've created the dlls by using CMake and Swig and following the instructions here adjusting the instructions where necessary to build for VS 2010 and .NET 4. Does any one have any ideas why this is happening and how I can fix it?

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• Installing a very old game on Windows 7 64-bit

  - by Josh

  I'm trying to install Theme Hospital (awesome game, eh?) on my Windows 7 machine and I'm getting this error: I've tried setting it to run in XP compatability mode but didn't hold out much hope, and as expected I still got this error. Is there a way I can force this application to run in 32-bit or something? Thank you.

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• Small Business Server services will not start, and remote desktop and UAC are broken

  - by Stephen Jennings

  Yesterday I began setting up a server with Windows Small Business Server 2008. All I am configuring it for right now is to be a domain controller and Exchange server. I completed the initial setup of SBS then started looking through different connection options (allowing VPN versus using a TS Gateway). After I rebooted one time, I started having three not-obviously-related issues: First, I could no longer remote desktop into the computer. I ran TCPView and saw that it was no longer listening on port 3389. I checked everything in Terminal Service Configuration but everything shows the computer ought to be allowing connections. Also, when I tried to use anything that required user account control elevation, the UAC dialog never popped up and the program that was waiting just froze. If I try to run "regedit" from the Run box, for example, it never appears. When I run in safe mode which does not run with UAC, I was able to access everything. I didn't want to deal with it, so I turned off UAC and rebooted. Finally, in the Windows SBS Console, there are status indicators for Security, Updates, Backup, and Other Alerts. The first three get stuck saying "Querying". Looking in the computer alerts, I have events showing the following services stopped: Background Intelligent Transfer Service KtmRm for Distributed Transaction Coordinator Distributed Transaction Coordinator Microsoft Exchange Information Store Microsoft Exchange System Attendant Microsoft Exchange Transport Windows Remote Management Update Services Windows Update I figured I must have configured something wrong accidentally and I couldn't find anything using Google explaining what might be the case, so I just decided to format the hard drive and reinstall SBS from scratch. I did this and everything was working last night, but I just turned the machine back on and it is doing the same thing again! On my second install, I did not configure anything except the following (all from SBS Console): Connect to the Internet (set IP and router address) Turn off customer feedback. Set up internet address. Decline to use a Smart Host for email. Added one standard user account. Since this happened again and I was very careful the second time not to configure anything outside of the SBS Console, I feel like there's something else going on. Right now the machine is on an isolated network that does have internet access. My desktop is the only other machine plugged into this network. Any and all help is appreciated (before I tear my hair out!)

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• Excel VBA: NetworkDays Error 2015

  - by Martin

  Hi All, I have the this bit of code in a VBA class which is to workout the number of days between a property of the class (a date) and today’s date. Dim EmailDate As Date EmailDate = Me.Email.DateReceived Debug.Print EmailDate, Date Debug.Print NetworkDays(EmailDate), Date, Range("BankHolidays")) When I run it I get the following output 23/04/2010 19/05/2010 [GetMacroRegId] 'NETWORKDAYS' < [GetMacroRegId] 'NETWORKDAYS' -> '699990072' > Error 2015 I have tested it in a module, using dummy data, and get the correct answer. Can anyone see why this would be giving an error in a class? I have referenced atpvbaen.xls. Edit: I have found that when I run the code through a menu option I have created on the menu bar it fails, but when I run it via a button or through the VB Editor it works fine. Looks like it is something to do with the menu. Thanks, Martin

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• Problem executing bash file

  - by sandelius

  HI there! I've run into some problem while learning to combine .sh files and PHP. I've create a file test.sh and in that file I call a PHP file called test.php. If I double click on the .sh file then it runs perfectly but when I try to run it from the terminal I get "command not found". I'm in the exact folder as my .sh file but it wont work. Here's my test.sh: #!/bin/bash LIB=${0/%cli/} exec php -q ${LIB}test.php one two three exit; When I doubleclick on the test.sh file then it returns the argv array like it suppost to. But why can't I run it from terminal?

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• NetBeans not finding JasperReports scriptlet

  - by Sean

  I'm using JasperReports 3.7.6 with NetBeans 6.9.1 and iReport 3.7.6. I have a report that uses scriptlets. When I run it from iReport everything is fine because I can tell iReport where to find the .jar file with the scriptlets. When I run that same report from a JSF-2.0 application the fields that rely on the scriptlet are not being populated correctly - i.e. the scriptlet isn't being called. I've tried putting the scriptlet in the project's library folder and I've tried copying the package containing the scriptlet into the project. Neither has worked. I'm not sure how I can get the report to call the scriptlets when it is run from my JSF project. Can anyone shed some light on this for me?

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• sshfs mount won't start from /etc/rc.local

  - by Alex Flo

  I have the following commands in /etc/rc.local chmod 666 /dev/fuse chmod +x /usr/bin/fusermount /bin/su someuser -c "/usr/bin/sshfs someuser@someserver:/usr/local/storage /usr/local/storage_remote -o nonempty -o reconnect" If I run them from command line, as root, they work. If I reboot the server they won't run from /etc/rc.local. I try to figure out what I do wrong but I don't have console access and I couldn't find any errors in /var/log related to sshfs.

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• SSL VPN Command Line Client

  - by Mathew

  How can I run the Array SSL VPN client via the command line w/o using a browser? I want to run the vpn client on a headless linux box.

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• Visual Studio 2010 does not discover new unit tests

  - by driis

  I am writing some unit tests in Visual Studio 2010. I can run all tests by using "Run all Tests in Current Context". However, if I write a new unit test, it does not get picked up by the environment - in other words, I am not able to find it in Test List Editor, by running all tests, or anywhere else. If I unload the project and then reload it; the new test is available to run. When I am adding a unit test, I simply add a new method to an already existing TestClass and decorating it with [TestMethod] attribute - nothing fancy. What might be causing this behaviour, and how do I make it work ?

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• Is SharePoint 2010 compatible with Windows 2008 R2 Server Core?

  - by Michael Stum

  Now that Core 2008 R2 added .net support, I wonder if it's possible to run SharePoint 2010 Web Frontends on it? Found some articles saying you can't run it on 2008 Core (no ASP.net support), but haven't found anything about R2 Core.

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• unable to start .bat file from JSP

  - by Stardust

  I have a batch file runthis.bat If I double click on this a text file is being created with name dir.txt Now I have to run this batch file using JSP. <% Runtime run =Runtime.getRuntime(); run.exec("C:/Program Files/Apache Software Foundation/Tomcat 5.5/webapps/try/runthis.bat"); out.println("SUCCESS"); %> I'm getting the output SUCCESS on a webpage but this batch file is not running. Whats might be the problem?

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• weird data-grid-view/crystal-reports behaviour c# winforms

  - by jello

  I have a winforms project which I keep in different versions, each version having its own project folder. All these projects use the same database file, which is copied in each project folder too. So if I run a project, let's say 0.34, and then I try to run 0.35, all the database functions don't work, unless I detach the database in SQL server management studio express. So all the database functions don't work, except the data grid view and/or crystal reports. But then, if I detach the database, and I run any version, all the database functions work, except the data grid view and/or crystal reports. So to recap, when the database functions work (like select), crystal reports doesn't work. But when the database functions don't work because the database is not detached, crystal reports works. weird. any ideas?

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• ASUS M2N-SLI Deluxe - 1 long and 2 short beeps

  - by Agares

  Hi! I bought Asus M2N-SLI Deluxe. When I put my stuff(all is 100% working): Athlon 4450e 2GB RAM GoodRAM 667MHz(It's polish brand, maybe not popular in other countries) Sapphire Radeon HD2600(I tried replacing it with S3 Trio PCI) with it I heard just 1 long and 2 short beeps. It changes only, when I run MB without processor - then computer run for few seconds and powers off. What's the problem?

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• Button click doesn't call function even when button attribute OnClick is set to that function

  - by Silmaril89

  Hi, I have an aspx page with two buttons, one of the buttons has an OnClick attribute to a function that should be run when clicked. When the other button is clicked there is an if statement checking if the page is a postback, if it is then I run some statements that need to be run when that button is clicked. That postback button works fine. However, the other button, when it's clicked the function it's supposed to call never executes, and the statements inside if (Page.IsPostBack) get executed instead. What can I do to fix this? Is there a way to make the button that calls a function not do a Post back?

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• PATH and CLASSPATH in Windows7 7 / Eclipse

  - by Richard Knop

  So I would like to set PATH and CLASSPATH system variables so I can use javac and java commands in the command line. I can just compile and run java programs in eclipse but I would also like to be able to run them through command line. This is where I have Java installed: C:\Program Files (x86)\Java jdk1.6.0_20 jre6 And this is where eclipse stores my Java projects: D:\java-projects HelloWorld bin HelloWorld.class src HelloWorld.java I have set up the PATH and CLASSPATH variables like this: PATH: C:\Program Files (x86)\Java\jdk1.6.0_20\bin CLASSPATH: D:\java-projects But it doesn't work. When I write: java HelloWorld Or: java HelloWorld.class I get error like this: Exception in thread “main” java.lang.NoClassDefFoundError: HelloWorld The error is longer, that's just the first line. How can I fix this? I'm mainly interested to be able to run compiled .class programs from the command line, I can do compiling in the eclipse.

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• Apache not loading Xdebug, but does when started from the Command Line

  - by JamesD

  I know that this sounds odd, but believe me, it's what is happening. Here are my system settings: Windows7 Apache 2.2 PHP 5.2.12 Xdebug 2.0.5 I have XDebug configured in my PHP.ini file. When I run php -m, I do in fact see that Xdebug is loaded. Now, if I start Apache AS A SERVICE (or by the Apache Monitor), and run phpinfo(), it is NOT showing Xdebug as being loaded. However, (now here's the crazy part), if I go to my Apache bin directory, and simply run httpd.exe, and then go and look at phpinfo(), Xdebug now shows as being loaded! Also, comparing some phpinfo() when started via service or by command line, it looks like the php.ini file is the same for either case. Everything looks the same except for the Xdebug being loaded part. Please, if you have any ideas it would be greatly appreciated.

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• ubuntu gnome short cut keys

  - by benjipete

  Hi, I have done something quite silly and not sure how to fix it. I modified some of the gnome keyboard short cuts and was trying to disable the "Run Application" command. In the process I assigned it to the delete key and every time I hit delete the "Run Application" window comes up. It would not normally be a problem but the "Keyboard Shortcuts" no long has the short cut in the window so I can't disable it. Any help advice would be appreciated. Cheers Ben

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