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HBase as a multimap

- by Ibrahim

Hi guys, I'm doing some large scale text processing work and I'm trying to get started with Hadoop and HBase. One of the things I need to do is build a multimap of some stuff, which I later use to look up things and get all items with a certain key (in a M/R job). Would it be OK to use HBase and insert many rows with the same key and rely on versions/timestamps to achieve a multimap-like setup or is this a bad idea? The multimap is built up in the reduce phase of a Mapreduce task by the way, or at least in the way I've formulated it on paper. Thanks! If more information is needed, I'd be happy to provide it. Not sure whether this question is clear.

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What would you do if you coded a C++/OO cross-platform framework and realize its laying on your disk

- by Manuel

This project started as a development platform because i wanted to be able to write games for mobile devices, but also being able to run and debug the code on my desktop machine too (ie, the EPOC device emulator was so bad): the platforms it currently supports are: Window-desktop WinCE Symbian iPhone The architecture it's quite complete with 16bit 565 video framebuffer, blitters, basic raster ops, software pixel shaders, audio mixer with shaders (dsp fx), basic input, a simple virtual file system... although this thing is at it's first write and so there are places where some refactoring would be needed. Everything has been abstracted away and the guiding principle are: mostly clean code, as if it was a book to just be read object-orientation, without sacrifying performances mobile centric The idea was to open source it, but without being able to manage it, i doubt the software itself would benefit from this move.. Nevertheless, i myself have learned a lot from unmaintained projects. So, thanking you in advance for reading all this... really, what would you do?

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Can't get Angular Dart Router to work

- by JesterXL

I've tried this syntax in AngularDart 0.11.0: Angular Dart passing data from route service into a controller module.value(RouteInitializerFn, configureRoutes); void configureRoutes(Router router, RouteViewFactory views) { print("configureRoutes"); views.configure({ 'login': ngRoute( path: '/login', view: 'login/login.tpl.html'), 'today': ngRoute( path: '/today', view: '/today/today.tpl.html') }); However, my routing function never seems to get called. I've used both a print statement and breakpoint to no avail. When I attempt to call it like so: WorkoutLoggerApplication(this.rootScope, this.router) { print("WorkoutLoggerApplication::constructor"); new Future.delayed(new Duration(seconds: 2), () { router.go("login", {}); }); } I get: Bad state: Invalid route name: login I've tried 0.10.0, but no dice. I've also tried 3 varieties of the new bind function format, both also don't seem to ever fire the routing function.

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Where is the best place to put <script> tags in HTML markup?

- by mipadi

When embedding JavaScript in an HTML document, where is the best place to put the <script> tags and included JavaScript? I seem to recall that you are not supposed to place these in the <head> section, but placing at the beginning of the <body> section is bad, too, since the JavaScript will have to be parsed before the page is rendered completely (or something like that). This seems to leave the end of the <body> section as a logical place for <script> tags. So, where is the best place to put the <script> tags? (This question references this question, in which it was suggested that JavaScript function calls should be moved from <a> tags to <script> tags. I'm specifically using JQuery, but more general answers are also appropriate.)

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Objective-C: Initializing char with char at index of string.

- by Mr. McPepperNuts

unichar myChar = [myString characterAtIndex:0]; [myNSMutableArray addObject:myChar]; I am trying to insert the first char of a string into an array, to create an array of chars. the first line does not give me an error. The second line however, provides the following error: warning: passing argument 1 of 'addObject:' makes pointer from integer without a cast This also crashes the application with a "bad address" error. I thought this error was due to a problem with memory allocation. Can someone shed some light on this.

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Can I have code that executes before and after tests are run by NUnit?

- by Billy ONeal

I've got a bunch of tests in NUnit which create garbage data on the filesystem (bad, I know, but I have little control over this). Currently we have a cleanup tool that removes these temporaries and such, but I'd like to be able to run that cleanup tool automatically. I'd have to be able to run it after all tests have finished running. I have similar checking that I'd like to do at the beginning, to ensure that there are none of these temporaries left from previous runs that might change the outcome of the tests. Is such a thing simple or am I going to have to implement a whole new test runner for such a thing?

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Accessing Password Protected Network Drives in Windows in C#?

- by tkeE2036

Hi Everyone, So in C# I am trying to access a file on a network, for example at "//applications/myapp/test.txt", as follows: const string fileLocation = @"//applications/myapp/test.txt"; using (StreamReader fin = new StreamReader(FileLocation)) { while(!fin.EndOfStream()){ //Do some cool stuff with file } } However I get the following error: System.IO.IOException : Logon failure: unknown user name or bad password. I figure its because I need to supply some network credentials but I'm not sure how to get those to work in this situation. Does anyone know the best way (or any way) to gain access to these files that are on a a password protected location? Thanks in advance!!

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learning and "singing" Ruby with Sinatra

- by microspino

Hello I'm trying to improve my ruby knowledge by reading The Ruby Programming Language book. Reading Coders at work I saw that lot of the interviewees suggest to dive into a project source code to learn best practices to be aware of bad habits and of course to take new inspirations for how to do things. I decided to pick a project as more self contained as I could find. My choice was Sinatra since It's 1000 LOC. Is It a good project to learn? Do you suggest another one more simple (i.e. less LOCs)? I've tried to see rails machinery before but I came out scared from It.

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How to generate a video signal from Android device via USB?

- by C.Rivlaldo

Is it possible to create an application for Android, which can generate a video signal (HDMI or VGA) via USB? Any Android device has miniUSB port. Theoretically it's possible to create a small commutator device on microcontroller or microscheme, which will be a USB-host for Android device. You'll connect Android device with commutator and then connect commutator with monitor. For example, the scheme looks like: Android phone - commutator (USB-host) - TV/Monitor. Summary, I need to connect android phone with TV via miniUSB port. I found soft which can use miniUSB - HDMI cable, but those apps only for Motorolla Droid and HTC Evo. I'll glad to get links to existing apps or projects on that theme, to info about software generation HDMI-signal and connecting Android devices with another devices. Thank you and sorry for my bad english!

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System("pause"); - Why is it wrong?

- by Faken

Here's a question that I don't quite understand: The command, System("pause"); is taught to new programmers as a way to pause a program and wait for a keyboard input to continue. However, it seems to be frowned on by many veteran programmers as something that should not be done in varying degrees. Some people say it is fine to use. Some say it is only to be used when you are locked in your room and no one is watching. Some say that they will personally come to your house and kill you if you use it. I, myself am a new programmer with no formal programming training. I use it because I was taught to use it. What I don't understand is that if it is not something to be used, then why was I taught to use it? Or, on the flip side, is it really not that bad after all? What are your thoughts on this subject?

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breaking out from socket select

- by kamziro

I have a loop which basically calls this every few seconds (after the timeout): while(true){ if(finished) return; switch(select(FD_SETSIZE, &readfds, 0, 0, &tv)){ case SOCKET_ERROR : report bad stuff etc; return; default : break; } // do stuff with the incoming connection } So basically for every few seconds (which is specified by tv), it reactivates the listening. This is run on thread B (not a main thread). There are times when I want to end this acceptor loop immediately from thread A (main thread), but seems like I have to wait until the time interval finishes.. Is there a way to disrupt the select function from another thread so thread B can quit instantly?

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How to use avg function?

- by Marcelo

I'm new at php and mysql stuff and i'm trying to use an avg function but i don't know how to. I'm trying to do something like this: mysql_connect(localhost,$username,$password); @mysql_select_db($database) or die ("Did not connect to $database"); mysql_query("AVG(column1) FROM table1 ") or die(mysql_error()); mysql_close(); echo AVG(column1); (Q1)I'd like to see the value printed in the screen, but i'm getting nothing but an error message. How could I print this average on the screen ? (Q2)If I had a column month in my table1, how could I print the averages by the months ? Sorry for any bad English, and thanks for the attention.

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[iPhone app] Inserting special char un NSString for URL use

- by Dough

Hi, I'm using HTTP connection to share data with my JSON server. I use URLs like "MyServlet?param1=value1" and so on... I'm now facing a problem with one of my servlet (I can't change it because some other views are using it) : The servlet is working with a syntax including those symbols "{" and "}". The exact syntax is {(value1_value2)(value3_value4)(value5_value6)}{(value7_value8)(value9_value10)(value11_value12)}{(value13_value14)(value15_value16)(value17_value18)} Values are integers, the problem is only when I use "{" and "}" my UrlConnection returns an error for bad URL. I use this to instantiate my NSString : NSString *myURL = [NSString stringWithFormat:@"http://somesite.com/Servlet?PARAM={(%@)}"]; How can I code those char in my NSString ? Thanks in advance !

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MongoDB or CouchDB - fit for production?

- by Alan

I was wondering if anyone can tell me if MongoDB or CouchDB are ready for a production environment. I'm now looking at these storage solutions (I'm favouring MongoDB at the moment), however these projects are quite young and so I foresee that I'm going to have to work quite hard to convince my manager that we should adopt this new technology. What I'd like to know is: 1) Who is using MongoDB or CouchDB today in a production environment? 2) How are you using MongoDB/CouchDB? 3) What problems (if any) did you come across when you adopted this new storage mechanism (and how did you overcome them)? 4) How did you deal with any migration issues that you had to deal with? 5) Do you have any good/bad experiences with either of these solutions that you'd like to share? Thanks.

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PHP, manipulating images and thumbnails?

- by learner.php

I am using php and mysql. I allow my registered users to upload photos, the photos are store in filesystem format, then I will keep the original/max size of : width: 1600px and heigh: 1200px. In the user profile page, I would like to display the image, it maybe one of the 5 types of thumnails: 500x500, 300x300, 200x200, 100x100 or 50x50. What is the best way to create the thumbnails, here are my current solutions: I am thinking of create 1 thumbnail, then from that thumbnail, i will resize in [img src="" width="XX"] tag, alternatively, store the different thumbnails size in database, then get and display it Create 5 thumbnails for each photos? (I am afraid this is a bad way) Whats the best practices?

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rails data aggregation

- by ash34

Hi, I have to create a hash of the form h[:bill] = ["Billy", "NA", 20, "PROJ_A"] by login where 20 is the cumulative number of hours reported by the login for all task transactions returned by the query where each login has multiple reported transactions. Did I do this in a bad way or this seems alright. h = Hash.new Task.find_each(:include => [:user], :joins => :user, :conditions => ["from_date >= ? AND from_date <= ? AND category = ?", Date.today - 30, Date.today + 30, 'PROJ1']) do |t| h[t.login.intern] = [t.user.name, 'NA', h[t.login.intern].nil? ? (t.hrs_per_day * t.num_days) : h[t.login.intern][2] + (t.hrs_day * t.workdays), t.category] end Also if I have to aggregate this data not just by login but login and category how do I accomplish this? thanks, ash

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Axis xsd:dateTime issue

- by milostrivun

Here is the whole thing. I 'm using a webservice, with wsdl2java I generate classes and communicate with another application. Problem is , when I use a method from my generated WS client that is resulting in data that contains some object with data in format xsd:dateTime(Axis 1.4), and that data is represensted by java.util.Calendar object in java has time shifted to GMT(about two hours before my time zone). That results in bad data that I have to substract two hours to display correct value. My question is, considering I didn't work on building that webservice(all I have is wsdl url) where is the problem and can I fix it or the problem is at the side of the webservice creator. If I'm it is not clear what I am asking I will gladly explain as much as I can.

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What does this PHP (function/construct?) do, and where can I find more documentation on it?

- by Rob

Simple question. Here is this code. $r = rand(0,1); $c = ($r==0)? rand(65,90) : rand(97,122); $inputpass .= chr($c); I understand what it does in the end result, but I'd like a better explanation on how it works, so I can use it myself. Sorry if this is a bad question. If you're unsure of what I'm asking about, its the (function?) used here: $c = ($r==0)? rand(65,90) : rand(97,122);

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Why does this script work in the current directory but fail when placed in the path?

- by kiloseven

I wish to replace my failing memory with a very small shell script. #!/bin/sh if ! [ –a $1.sav ]; then mv $1 $1.sav cp $1.sav $1 fi nano $1 is intended to save the original version of a script. If the original has been preserved before, it skips the move-and-copy-back (and I use move-and-copy-back to preserve the original timestamp). This works as intended if, after I make it executable with chmod I launch it from within the directory where I am editing, e.g. with ./safe.sh filename However, when I move it into /usr/bin and then I try to run it in a different directory (without the leading ./) it fails with: *-bash: /usr/bin/safe.sh: /bin/sh: bad interpreter: Text file busy* My question is, when I move this script into the path (verified by echo $PATH) why does it then fail? D'oh? Inquiring minds want to know how to make this work.

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Prolog .. Can i convert from a list of chars to a string or term in Prolog !!

- by AhmadAssaf

i use read_line_to_codes(Stream,Line) to read a line from a file .. first is there any way to read a line and assign it to a term in prolog ?? if not i managed to read a line and put it in this char list .. now this char list contains spaces .. which is bad .. so i want to convert it to a term or a string in prolog so that i can process it easier .. spaces cannot be atoms so thats a problem .. i appreciate the help !!

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another approach to returning some thing to browser in mvc with ajax call instead of using response.

- by Sadegh

hi, i have one section in my mvc 2.0 project which doing some processes and after each, return some messages (string) with response.write(). and this messages returned to browser with bad format. i want to return messages to one specific HTML div and add each to end of contents of div tag. now how do this? this event after each procces raised and message returned to browser. public void OnProgressEvent(System.Object source, CustomEventArgs customEventArgs) { if (customEventArgs.Level > 5) { Response.Write(customEventArgs.Message + "<br />"); Response.Flush(); } }

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Where is the best place to put <script> tags in HTML markup?

- by mipadi

When embedding JavaScript in an HTML document, where is the best place to put the <script> tags and included JavaScript? I seem to recall that you are not supposed to place these in the <head> section, but placing at the beginning of the <body> section is bad, too, since the JavaScript will have to be parsed before the page is rendered completely (or something like that). This seems to leave the end of the <body> section as a logical place for <script> tags. So, where is the best place to put the <script> tags? (This question references this question, in which it was suggested that JavaScript function calls should be moved from <a> tags to <script> tags. I'm specifically using JQuery, but more general answers are also appropriate.)

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Code Igniter Update Engine

- by tarnfeld

Hey, I am planning to develop a pretty awesome new web app that has a one time fee including free updates of 1.X updates (X being the update). I don't want to get people to download a new version and install it manually as it can be a real pain for some people, also it's bad if there is an important bug that needs fixing and people don't update. The app will be built with Code Igniter so I was looking for some kind of integrated system that allowed me to send out updates for the web app? All suggestions are very much appreciated!

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HTML, PHP No data in drop down box

- by Makinitez21

Hey, I am trying to figure out why a website's drop down box will not show any options. The data file for this drop down box comes from a microsoft access .mde file. The file is present and after the last update was working fine. Some changes happened to the site, i.e. text got added along with some photos. Im not saying this was when the drop down box went bad, but when it was discovered these were the only changes made. The data file seems fine as it is worked with everyday. Can anyone point me in the right direction as to where to begin looking for the bug? For a better idea of what I am talking about, check out the Site http://yogaalliance.org/teacher_search.cfm and try selecting a country. Thank you in advance

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How do you detect when the mouse leaves the stage in ActionScript 2?

- by Theo

I have the bad luck of having to downport some ActionScript 3 code to ActionScript 2 and I have a problem with detecting when the mouse leaves the stage. In ActionScript 3 there is an event called Event.MOUSE_LEAVE, which can be used to detect when the mouse leaves the stage, but there is no equivalent in ActionScript 2 as far as I can see. How would you best emulate the same functionality? Listening for mouse movement and checking the mouse coordinates against the bounds of the stage doesn't work because the mouse coordinates stop updating when the mouse leaves the stage.

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