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• Why do HDFS clusters have only a single NameNode?

  - by grautur

  I'm trying to understand better how Hadoop works, and I'm reading The NameNode is a Single Point of Failure for the HDFS Cluster. HDFS is not currently a High Availability system. When the NameNode goes down, the file system goes offline. There is an optional SecondaryNameNode that can be hosted on a separate machine. It only creates checkpoints of the namespace by merging the edits file into the fsimage file and does not provide any real redundancy. Hadoop 0.21+ has a BackupNameNode that is part of a plan to have an HA name service, but it needs active contributions from the people who want it (i.e. you) to make it Highly Available. from http://wiki.apache.org/hadoop/NameNode So why is the NameNode a single point of failure? What is bad or difficult about having a complete duplicate of the NameNode running as well?

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• You know you're a "version control avoider" if [closed]

  - by kmote

  I'm in the process of trying to introduce Version/Revision Control to a team of developers who have never used it. I'll be giving a presentation that I hope will be a persuasive explanation of the importance of Version Control -- the benefits of using it and the liabilities of avoiding it. I'd like to kick it off with an amusing but instructive list modelled after the "redneck" line of jokes. Can anyone help me add to this list? "You know you're a Version Control Avoider if..." You have a bunch of files or folders with names like Engine_05212012_works_old[2].cpp You've had to explain to your boss how you accidentally overwrote production code. I don't consider myself terribly witty, but I think a little humor could be helpful in this situation. Any ideas for how to extend this list? [Bonus points if you can suggest a better moniker than "Version Control Avoider"]

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• Repairing back-facing triangles without user input

  - by LTR

  My 3D application works with user-imported 3D models. Frequently, those models have a few vertices facing into the wrong direction. (For example, there is a 3D roof and a few triangles of that roof are facing inside the building). I want to repair those automatically. We can make several assumptions about these 3D models: they are completely closed without holes, and the camera is always on the outside. My idea: Shoot 500 rays from every triangle outwards into all directions. From the back side of the triangle, all rays will hit another part of the model. From the front side, at least one ray will hit nothing. Is there a better algorithm? Are there any papers about something like this?

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• Referencing external javascript vs. hosting my own copy

  - by Mr. Jefferson

  Say I have a web app that uses jQuery. Is it better practice to host the necessary javascript files on my own servers along with my website files, or to reference them on jQuery's CDN (example: http://code.jquery.com/jquery-1.7.1.min.js)? I can see pros for both sides: If it's on my servers, that's one less external dependency; if jQuery went down or changed their hosting structure or something like that, then my app breaks. But I feel like that won't happen often; there must be lots of small-time sites doing this, and the jQuery team will want to avoid breaking them. If it's on my servers, that's one less external reference that someone could call a security issue If it's referenced externally, then I don't have to worry about the bandwidth to serve the files (though I know it's not that much). If it's referenced externally and I'm deploying this web site to lots of servers that need to have their own copies of all the files, then it's one less file I have to remember to copy/update.

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• Design Pattern Books, Papers or Resources for Non-Object Orientated Paradigms?

  - by FinnNk

  After viewing this video on InfoQ about functional design patterns I was wondering what resources are out there on design patterns for non-object orientated paradigms. There are plenty out there for the OO world (GOF, etc, etc) and for architecture (EoEAA, etc, etc) but I'm not aware of what's out there for functional, logic, or other programming paradigms. Is there anything? A comment during the video suggests possibly not - does anyone know better? (By the way, by design patterns I don't mean language features or data structures but higher level approaches to designing an application - as discussed in the linked video)

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• How can I refactor a code base while others rapidly commit to it?

  - by Incognito

  I'm on a private project that eventually will become open source. We have a few team members, talented enough with the technologies to build apps, but not dedicated developers who can write clean/beautiful and most importantly long-term maintainable code. I've set out to refactor the code base, but it's a bit unwieldy as someone in the team out in another country I'm not in regular contact with could be updating this totally separate thing. I know one solution is to communicate rapidly or adopt better PM practices, but we're just not that big yet. I just want to clean up the code and merge nicely into what he has updated. Would a branch be a suitable plan? A best-effort-merge? Something else?

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• Site Description h2 vs p

  - by user1010609

  I tend to follow this html structure while creating new site on my main page: <div class="header"> <img alt="keyword" title="keyword logo" src="keyword.png" /> <div> <h1>keyword</h1> <p><b>keyword + hierarchy keywords</b></p> </div> </div> As you can see Im using <p><b></b></p> to put short description of the site in it but I was wondering If maybe h2 would be better to use here?

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• access denied when trying to open terminal on desktop

  - by chris

  ok so heres the skinny. I just moved some file using the sudo su command so i can move them to bin folder in file system then after closing terminal tried to reopen from desktop and got permission denied. I then rebooted and now i cant access my account and when trying to login it starts to boot then back to login screen. I then boot up in xterm and i get this message bash: /home/chris/.bashrc:Permission denied. I'm currently running xubuntu 10.04 and would like to get back in to that user. Can someone please help me. Not a noob but close to it. Thanks to anyone who helps and the quicker the better.

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• brackets in php templates

  - by Othman

  I have a script, and now it's the perfect time to have an option to change theme templates. I was looking forward to store these files in php files, or html files. with CSS file. I looked over some codes and I found that they use brackets to refer to the variable. Here's an example of a template block: <div class='block_div'> <center>{title}</center> {content} </div> I know that I can use PHP vars usering <?=$var;?>. However, I think the one above is better, and I looked over the web to find anything about it but I couldn't. My Question is how I can use these brackets in my php or html code. to let the user changing the template only not the code!

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• 12.04 Install Freeze, Blank Cursor Page

  - by smmilke

  I have been trying to install Ubuntu 12.04 via a live CD and most recently with the windows installer I found on line. The windows installer seemed to be working; I selected the partitioned portion of the drive on which to install Ubuntu and started the install process. The process freezes on a page with a flashing cursor and nothing else displayed. I have read about similar problems but have not been able to implement any of the solutions people have discussed. Any ideas on what might be hanging up the process, or how to get a better idea of what is causing the problem would be helpful. If anyone has had this problem and has a solution it would be GREATLY appreciated!

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• Switch to https

  - by Mike

  I'm looking to use an .htaccess file to use mod_rewrite to switch the protocol from http:// to https:// when someone hits my website. For instance, once someone goes to: http://www.mywebsite.com/ I'd like the browser to switch to: http*s*://www.mywebsite.com/ The same goes for the http://mywebsite.com/ - https://mywebsite.com This is the following code I've been using and I've experienced some odd things so if anyone could provide me with information if this is the right way to do it, or if you have a better way, please provide it. Thanks in advance. RewriteEngine On RewriteCond %{SERVER_PORT} !=443 RewriteRule ^(.*)$ https://www.ebaillv.com/$1 [R=301,L]

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• How do you go about checking your open source libraries for keystroke loggers?

  - by asd

  A random person on the internet told me that a technology was secure(1), safe to use and didn't contain keyloggers because it is open source. While I can trivially detect the key stroke logger in this open source application, what can developers(2) do to protect themselves against rouge committers to open source projects? Doing a back of the envelope threat analysis, if I were a rogue developer, I'd fork a branch on git and promote it's download since it would have twitter support (and a secret key stroke logger). If it was an SVN repo, I'd create just create a new project. Even better would be to put the malicious code in the automatic update routines. (1) I won't mention which because I can only deal with one kind of zealot at a time. (2) Ordinary users are at the mercy of their virus and malware detection software-- it's absurd to expect grandma to read the source of code of their open source word processor's source code to find the keystroke logger.

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• Shortcut to change Launcher 'Hide' setting

  - by joris

  When I'm working on my laptop I have periods that I am only using a couple of programs, so the default intellihide setting of the Launcher ('Dodge windows') is very handy. But I also have periods that I have to switch very often between programs, and then I find it very useful (and better for my workflow) that the Launcher doesn't hide. Now, every time I wan't to switch I have to open CCSM and change the setting (Unity plugin - Hide Launcher), but it would be easier if I could use a shortcut for it. So my question: Is there a way to create a shortcut to switch between (or change) the two settings of Compiz? I thought of command line interface to compiz, but I couldn't directly find something like that.

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• How to keep a team well-trained?

  - by PierrOz

  Hi dear fellows, I'm currently mentoring a small team of 4 junior dev in small software company. They are very smart and often achieve their tasks with a high-quality job but I'm sure they still can do better - actually I have exactly the same feeling for myself :) -. Besides some of them are more "junior" than other. So I would like to find of a funny way to improve their CS skills (design, coding, testing, algorithmic...) in addition to the experience they acquire in their daily work. For instance, I was thinking of setting up weekly sessions, not longer than 2 hours, where we could get together to work on challenging CS exercises. A bit like a coding dojo. I'm sure the team would enjoy that but is it really a good idea? Would it be efficient in a professional context? They already spend all their week to code so how should I organize that in order for them to get some benefits? Any feedback welcome !

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• ASP.NET or PHP for news website? [closed]

  - by Goma

  Whcih is better to build a news website from scratch with the following features: Every registered member can read the news. some members (moderators) can add news. Admin can edit, delete,etc. Every thread or topic may contain many pictures. Members can reply and add their comment. Members can upload their photos and other photos. There will be private messages between users. The visitors will be arround 2,000,000, every day.

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• '/'var/www/' vs '/home/$USER/public_html'

  - by OrganizedFellow

  I recently started using Ubuntu as a LAMP server. I've come across plenty of tutorials that say to place the files at '/var/www/' and I've also seen others that put them in '/home/$USER/public_html/'. During my testing and figuring stuff out, I was successfully able to view a test site URL from each location. Is one better than the other? I thought that maybe it was just preference. But the more I think about it, the more I want to keep all my work in my Home folder.

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• Friday Fun - Conference Videos from JavaZone & others

  - by alexismp

  Trailers or promotion videos can be very effective when done right and the Java community has been pretty good at it IMO. The latest ones are short teasers coming from the JavaBin folks to promote their very fine JavaZone conference in Oslo, Norway in September (celebrating their 10th anniversary). Update: the entire trailer is now available. Previous videos include Lady java and Java 4 Ever (must see if you somehow missed them). The inspiration for these may have come from the JavaPolis (now Devoxx) 2006 "There are better ways to meet your idols" trailer. IIRC, James Gosling was quoted saying "This is sick, I love it!". Your mileage may vary ;) Sun Microsystems also used to make some "promotion" videos. Here's a selection.

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• What time planning tools do you use?

  - by sbrattla

  I'm trying to get a better overview of my tasks, and I'm looking for a tool which would let me enter tasks (everything from 2 hour tasks to 2 week tasks) and then simply let me organize these tasks on a timeline. I'm thinking that all tasks would have an estimated duration, and I could then prioritize these tasks by moving them along the timeline to prioritize them. The timeline would then show me the "tasks stack" and how far into the future i'm occupied. I'm not looking for an issue/bug handling system, but simply a tool which lets me get an overview of my tasks. I guess we're more into the category of resource planning. What tools do you use for this?

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• How to reduce the size of a pdf file?

  - by Nicole

  I'm looking for a way in Ubuntu to reduce the size of a pdf (by reducing the quality of the images). I know that this can be done in Ghostscript by typing the following command in terminal: gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf The problem is that I can't specify the quality with any accuracy. The parameter -dPDFSETTINGS=/screen is the one that decides the quality; but the alternatives are quite rigid (for example it is possible to do -dPDFSETTINGS=/ebook for slightly better quality). I'm looking for a way to reduce the size of a pdf in a way that allows me to specify the desired quality numerically. I know that this is possible in a Mac, so it must be possible in Linux -- right? Any help would be well appreciated.

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• How to tell google a blog article has been updated?

  - by Scott

  The URL of my posts has the publication date and slugged title, but how can I best show google search users that an article has been updated since its original publication? I was considering devoting a few characters of the meta description (e.g. "updated 2013-Aug-1), or doing so under the first h1 tag. I don't want to hurt the seo value of my site, but I also want to let users know that articles have been substantially updated since their publication. Is there a better way to do this?

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• About partition sizes

  - by Lassi

  I am going to install Ubuntu on a new computer, but I'm not quite sure how big each partition should be. If I create only root, home and swap partitions, on what partition will programs be installed? Will they go to /home or to root? Basically does it make sense for instance to have following partitions: / - 6GB /home - 80GB /swap - 4GB Is 6GB large enough for my root partition? Also are these 3 partitions a good choice, or is there a better configuration? I have at the moment 3 operating systems installed, and I do make changes quite often.

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• Should I tell a departed coworker about their "sev 1" defect?

  - by noahz

  I had a co-worker leave our company recently. Before leaving, he coded a component that had a severe memory leak that caused a production outage (OutOfMemoryError in Java). The problem was essentially a HashMap that grew and never removed entries, and the solution was to replace the HashMap with a cache implementation. From a professional standpoint, I feel that I should let him know about the defect so he can learn from the error. On the other hand, once people leave a company, they often don't want to hear about legacy projects that they have left behind for bigger and better things. What is the general protocol for this sort of situation?

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• How to build a .Net app which runs on desktop and as a Windows Service

  - by Mike

  Ok, I hope this is not too much confusing (with my poor English). I want to build a small .Net 4.0 app which monitors several other applications on a Windows Server OR on a regular Windows PC. It will have a WPF GUI with a variety of graphical controls. The app will be used in the following scenarios: If installed on a PC it should run as a “normal” single Windows desktop app If installed on a Server, it should run as a Windows Service. To use/manage the app it must have the same WPF GUI as in scenario 1 and the GUI should be run on the Server or on a remote PC At the moment I consider to write the application logic and connect it to the WPF GUI using a self-hosted WCF Data Service IN BOTH SCENARIOS. Since I’m not a pro developer I suppose it’s possible that I've missed something ;-) Will this work? Are there other/better solutions? Any answer or comment is highly appreciated.

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• New EMEA Partner Community for Hardware

  - by Julien Haye

  We are delighted to announce the availability of the EMEA HW partner community. The EMEA Partner Community for Hardware is the place where partners in Europe, Middle East and Africa can share experiences and best practices about selling and implementing Servers, Storage and Solaris based projects. You will also receive first-hand information from Oracle on products, training and tools that can help you better market, sell and implement your projects and services based on Oracle Hardware. If you are an individual  working for an Oracle partner and your job is selling, implementing or supporting Oracle Servers, Storage and Solaris projects in EMEA then this community is for you. For further information on the EMEA HW partner community and instructions on how to become a member please visit: www.oracle.com/partners/goto/hardware-emea

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• Verify uniqueness of new content

  - by rogerkk

  I'm working on a review site, where there is a minor issue with almost duplicate reviews across items. Just a few words are changed. It would be very nice to be able to uncover these duplicates before they are approved by a moderator, and I'm hoping someone could chime in on the best strategy to get there. The site is running Ruby on Rails on a Postgres database and using Thinking Sphinx for search (all on Heroku), and so far the best option I see is to be pulling all the reviews out of the db and using a module like amatch to compare the strings. Not very efficient, so in this case I guess I'll have to limit the number/age of reviews to scan for dupes. Anyone got a better idea?

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