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  • Does changing the default HDFS replication factor from 3 affect mapper performance?

    - by liamf
    Have a HDFS/Hadoop cluster setup and am looking into tuning. I wonder if changing the default HDFS replication factor (default:3) to something bigger will improve mapper performance, at the obvious expense of increasing disk storage used? My reasoning being that if the data is already replicated to more nodes, mapper jobs can be run on more nodes in parallel without any data streaming/copying? Anyone got any opinions?

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  • “Apparently, you signed a software services agreement without fully understanding it.”

    - by Dave Ballantyne
    I am not a lawyer. Let me say that again, I am not a lawyer. Todays Dilbert has prompted me to post about my recent experience with SqlServer licensing. I'm in the technical realm and rarely have much to do with purchasing and licensing.  I say “I need” , budget realities will state weather I actually get.  However, I do keep my ear to the ground and due to my community involvement, I know, or at least have an understanding of, some licensing restrictions. Due to a misunderstanding, Microsoft Licensing stated that we needed licenses for our standby servers.  I knew that that was not the case,  and a quick tweet confirmed this. So after composing an email stating exactly what the machines in question were used for ie Log shipped to and used in a disaster recover scenario only,  and posting several Technet articles to back this up, we saved 2 enterprise edition licences, a not inconsiderable cost. However during this discussion, I was made aware of another ‘legalese’ document that could completely override the referenced articles, and anything I knew, or thought i knew, about SqlServer licensing. Personally, I had no knowledge of this.  The “Purchase Use Rights” agreement would appear to be the volume licensing equivalent of the “End User License Agreement” , click throughs we all know and ignore.  Here is a direct quote from Microsoft licensing, when asked for clarification. “Thanks for your email. Just to give some background on the Product Use Rights (PUR), licenses acquired through volume licensing are bound by the most recent PUR at the time of license acquisition. The link for the current PUR and PUR archive is http://www.microsoft.com/licensing/about-licensing/product-licensing.aspx. Further to this, products acquired through boxed product or pre-installed on hardware (OEM) are bound by the End User License Agreement (EULA). The PUR will explain limitations, license requirements and rulings on areas like multiplexing, virtualization, processor licensing, etc. When an article will appear on a Microsoft site or blog describing the licensing of a product, it will be using the PUR as a base. Due to the writing style or language used by the person writing areas of the website or technical blogs, the PUR is what you should use as a rule and not any of the other media. The PUR is updated quarterly and will reference every product available at that time working on the latest version unless otherwise stated. The crux of this is that the PUR is written after extensive discussions between the different branches of Microsoft (legal, technical, etc) and the wording is then approved. This is not always the case for some pages explaining licensing as they are merely intended to advise and not subject to the intense scrutiny as the PUR.” So, exactly what does that mean ? My take :  This is a living document, “updated quarterly” , though presumably this could be done on a whim and a fancy.  It could state , you are only licensed if ,that during install you stand in a corner juggling and that photographic evidence is required. A plainly ridiculous demand but,  what else could it override or new requirements could it state that change your existing understanding of the product or your legal usage of it. As i say, im not a lawyer, but are you checking the PURA prior to purchase ?

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  • which is better performance, using a disposable local variable or reusing a global one?

    - by petervaz
    This is for an android game. Suppose I have a function that is called several times for second and do some calculations involving an arraylist (or any other complex objects for what matter). Which approach would be preffered? local: private void doStuff(){ ArrayList<Type> XList = new ArrayList<Type>(); // do stuff with list } global: private ArrayList<Type> XList = new ArrayList<Type>(); private void doStuff(){ XList.clear(); // do stuff with list }

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  • Is the increase in earning potential for a software developer enough to justify the cost of pursuing a masters degree? [closed]

    - by John Connelly
    Possible Duplicate: Is a Master's worth it? I am considering possibly enrolling in distance education at Kaplan University in order to pursue my masters. On one hand, I would prefer to have more free time so that I can continue to study for certifications and play with the technologies that interest me, work on my little side projects, etc. On the other hand, I am wondering how much difference it can make for my career if I go ahead and get a masters. I have been a .NET programmer since about 2004/2005. I'm currently working in a stable position but possibly considering a move to phoenix when my company's contract runs its course. There is not enough time between now and then for me to be complete with my masters, but I'm just trying to consider whether I should start. The main thing I am trying to determine is really whether or not the increase in earning potential is going to make the cost of pursuing my masters degree a good investment. Any thoughts?

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  • How do you QA and release software quickly with a large team?

    - by sadadasd
    My work used to be a smaller team. We had less than 13 devs for a while. We are now growing rapidly, and are over 20 with plans to be over 30 in a few months. Our process for QA'ing and releasing each build is no longer working. We currently have everyone develop the new code, and stick it onto a staging environment. A few days before our weekly release, we would freeze the staging environment and QA everything. By our normal release time, everything was usually deemed acceptable and pushed out the door to the main site. We reached a point where our code got too big so we could no longer regress the entire site each week in QA. We were ok with that, we just made a list of everything important and only covered that and the new stuff. Now we are reaching a point where all the new stuff each week is becoming too big and too unstable. Our staging environment is really buggy week after week, and we are usually 1-2 hours behind the normal release time. As the team is growing further, we are going to drown with this same process. We are re-evaluating everything, and I personally am looking for suggestions / success stories. Many companies have been where before and progressed beyond, we need to do the same

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  • Software solution from the 2000's, should I attempt to patch or remake the whole thing?

    - by ShadowScripter
    I was sent out to discuss a system that a certain company is currently using and what should be done with it. The company manufactures various carton displays. This system was developed to keep track of clients, orders and prices. Lots have happened since the system was created and the system is now, as the manager described it, "locked up" and "problematic", which I translate as "not dynamic" and "unstable". Some info about the system It was developed around the year 2000 Fairly small system, 2-5 users, 6 forms, ~8 tables with average quantities of data Built on early Visual Basic, forms created with the drag and drop design. Interface is basically just a window with a menu and some forms Uses MSSQL database (SQL2005 server) to store data and ODBC driver to query, data was migrated from excel before this system, and before excel it was handled, calculated and written by hand and paper Users work in Microsoft XP environment (and up) Their main problem is that they can't adjust and calculate prices, can't add new carton types etc, correctly anymore because they can't (or rather, they don't know how to) touch the data on the server. I suggested 3 possible solutions Attempt to patch the current system Create a fresh new interface (preferably similar environment, VB.net or VB based) Bring it back to an Excel solution, considering it is such a small system There might be more options, but these are the ones I could think of. My questions are What should I recommend and why? What is or could be the pros and cons of these alternatives? Are there other (possibly better) alternatives?

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  • How do I prevent software packages from being downloaded until I know it's safe?

    - by Dave M G
    Recently, an update that caused a problem with Gnome session caused me to lose a day's work. The solution was to rollback some packages to a previous version. The update manager is now telling me that my old packages should be updated: ... but I don't want to do that until I know that whatever bug or problem the latest version has is resolved. I understand that with any upgrade that there is a risk of instability. However, in the 8 years or more that I've been on Ubuntu, using the latest releases has been stable enough and with the benefit of the latest features and security. So, I'm not looking for general advice on how to handle upgrades. What I'm saying is that in this one particular instance, the bug introduced by these upgrades is severe and time wasting. But, as an end user, when I encounter a problem like this, I have no idea how to address a specific concern about a specific package. I don't, for example, know which of these packages is the problem, and I can't take time from my work schedule to be experimenting with each package. So, my question is: How do I find out who exactly is responsible for these, or any, packages so that I can contact them and let them know about the problem? How do I freeze these packages only, but allow other upgrades to happen? ubuntu-session gnome-session-common gnome-session-bin gnome-session

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  • How are people using virtualisation with SQL Server? Part 3

    - by GavinPayneUK
    Monitoring After CPU, memory and storage, monitoring is the fourth thing which changes massively according to Brent Ozar’s list when you move to virtualisation. Some of the performance counters we used to organise our lives around become meaningless and the performance of the host server is often over-looked when looking for problems. What’s encouraging here is that the majority of people are already looking beyond the performance of virtual server and at the performance of the host server. This...(read more)

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  • Why am I getting such slow file transfer performance?

    - by kingdango
    Copying 4GB from a USB flash drive to my Linux partition. The flash drive is NTFS formatted (I believe, it's Windows formatted). The transfer is incredibly slow and blocks the computer frequently causing lag and hanging applications. My transfer rate is 1.2 MB/sec and that is the max it has hit when I let the File Operations window have focus. Why is this so slow under Ubuntu and significantly faster in Win 7?

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  • Can you tell whether I have a hardware or software problem with a DVD-ROM drive?

    - by user8934
    Trying to copy the content of a DVD on a Asrock ION 330 running Maverick, i.e. with: dd if=/dev/sr0 of=dvdcopy ...I get errors in /var/log/messages: Jan 15 17:18:15 asrock kernel: [ 2616.445966] sr 1:0:0:0: [sr0] Unhandled sense code Jan 15 17:18:15 asrock kernel: [ 2616.445975] sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE Jan 15 17:18:15 asrock kernel: [ 2616.445984] sr 1:0:0:0: [sr0] Sense Key : Medium Error [current] Jan 15 17:18:15 asrock kernel: [ 2616.445994] sr 1:0:0:0: [sr0] Add. Sense: Id CRC or ECC error Jan 15 17:18:15 asrock kernel: [ 2616.446004] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 00 02 00 00 02 00 I'd tell it is a hardware problem, but it happens with various DVDs and on a second PC, also running Maverick... Both the PCs previously ran Lucid, same problems.

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  • Do unused vertices in a 3D object affect performance?

    - by Gajet
    For my game I need to generate a mesh dynamically. Now I'm wondering does it have a noticeable affect in FPS if I allocate more vertices than what I'm actually using or not? and does it matter if I'm using DirectX or OpenGL? Edit Final output will be a w*h cell grid, but for technical issues it's much easier for me to allocate (w+1)*(h+1) vertices. Sure I'll only use w*h vertices in indexing, and I know there is some memory wasting there, but I want to know if it also affect FPS or not? (Note that mesh is only generated once in each time you play the game)

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  • What would be the market life of a JVM based software framework?

    - by Nav
    I saw how Struts 1 lasted from 2000 to 2013. I hear that people are moving from Struts 2 to Spring. But for a project that may need to be maintained for a decade or two, would it be advisable to opt for a framework or directly code with servlets and jquery? Can a system architecture really be designed keeping in mind a particular framework? What really is the market life of a framework? Do the creators of the framework create it with the assumption that it would become obsolete in a decade?

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  • Should a software developer get a yearly equipment budget?

    - by CrazyDart
    I am looking at a new position with a new company. I have talked to some people in the past (in general, not at this company) that they had been given a yearly budget to buy new computer stuff to keep up to date. Now why I feel this question is worth asking here is that Joel comes right out and says an employer should pay for the best equipment money can buy... within reason of course. From The Joel Test: 12 Steps to Better Code 9. Do you use the best tools money can buy? Writing code in a compiled language is one of the last things that still can't be done instantly on a garden variety home computer... Top notch development teams don't torture their programmers. Even minor frustrations caused by using underpowered tools add up, making programmers grumpy and unhappy. And a grumpy programmer is an unproductive programmer... Does anyone know if the industry has such a standard to offer an allowance or budget? I have never worked for a company like this, but I am thinking I should toss this in the ring for negotiations. Seems reasonable. How do bigger companies like MS, Google, and Apple handle this? If you say yes, give a range... I have been told numbers from $5k to $10k. Seems high to me, but hey I would gladly take it.

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  • Integrating feature request functionality directly into the business software you write?

    - by Aaron Anodide
    What are relative merits of something like a button on a piece of custom bizware that says, "press me to ask for a feature" or "click here if something didn't work right". The problem I'm trying to remedy is the general lack of formality surrounding feature requests. Most specifically, the rate at which I receive walk-ups from end-users. Taken one at a time, it can be beneficial, but sometimes it can hinder productivity on the larger scale. Has anyone done something like this and has it been a general success or alternately somewhat a waste of time. My instincts are not giving me a hint here.

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  • Is this a legitimate registry key? (windows 7)

    - by Keyes
    In hkey_local_machine/software/classes I found some registry keys named msime.taiwan, msime.japan and a couple others with similar names, except with a number at the end of, so there was 4 keys altogether. From what I know itmcoulc be associated with a thing in windows that lets you write japanese characters or whatever. I also found a macaffee page, , which seemed dated but it said the key is created by a virus named w32 virut. Just wondering is this a legit key? I found it on another pc and both pcs show when exported to a .txt show it was last written to in 2009. Here is the reg query for the 4 keys. (added lines to differentiate them.) HKEY_LOCAL_MACHINE\Software\Classes\MSIME.Japan (Default) REG_SZ Microsoft IME (Japanese) HKEY_LOCAL_MACHINE\Software\Classes\MSIME.Japan\CLSID (Default) REG_SZ {6A91029E-AA49-471B-AEE7-7D332785660D} HKEY_LOCAL_MACHINE\Software\Classes\MSIME.Japan\CurVer (Default) REG_SZ MSIME.Japan.11 HKEY_LOCAL_MACHINE\Software\Classes\MSIME.Japan.11 (Default) REG_SZ Microsoft IME (Japanese) HKEY_LOCAL_MACHINE\Software\Classes\MSIME.Japan.11\CLSID (Default) REG_SZ {6A91029E-AA49-471B-AEE7-7D332785660D} HKEY_LOCAL_MACHINE\Software\Classes\MSIME.Taiwan\CLSID (Default) REG_SZ {F407D01A-0BCB-4591-9BD6-EA4A71DF0799} HKEY_LOCAL_MACHINE\Software\Classes\MSIME.Taiwan\CurVer (Default) REG_SZ MSIME.Taiwan.8 HKEY_LOCAL_MACHINE\Software\Classes\MSIME.Taiwan.8 (Default) REG_SZ IMTCCORE HKEY_LOCAL_MACHINE\Software\Classes\MSIME.Taiwan.8\CLSID (Default) REG_SZ {F407D01A-0BCB-4591-9BD6-EA4A71DF0799}

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  • Game planning and software design? I feel that UML is not convenient

    - by user1542
    In my university, they always emphasize and hype about UML design and stuff, in which I feel it is not going to work well with game structure design. Now, I just want a professional advice on how should I begin my game designing? The story is I have some skill in programming and have done many minor game such as getting some 2D platformer working to some extend. The problems that I find about my program is the poor quality design. After coding for a while, things start to break down due to poor planning (When I add new feature, it tends to make me have to recode the whole program). However, to plan everything out without a single design flaw is a bit too ideal. Therefore, any advice to how should I plan my game? How should I put it into visible pictures, so that me and my friends are able to overview the designs? I planned to start coding a game with my friend. This is going to be my first teamwork, so any professional advices would be a pleasure. Is there any other alternatives than UML? Another question is how does "prototyping" normally looks like?

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  • what are the duties of a software control management (scm) engineer in a large company?

    - by Alex. S.
    I'm curious about what are the canonical responsibilities of such specialized role. Normally, I expected this to be part of the tasks of a normal developer, but in large companies I know this role is to be fulfilled by an engineer in his own. In my current company, there is a possibility for a new opening in a SCM position, so I could apply, but first I would like to hear about what, in your experience, characterize best this role.

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  • Which is better a computer science degree or a Software engineer degree?

    - by Shadow wolf
    I'm asking here so since you all have experience in or around game programming, that's what I want to do, and I’m trying to find as many options as I can before my senior year, which is next year. So do you have any opinions on the matter of which would give me a better education in programming? Please no talking about anything other than the two degrees because I know of game programming degrees out there but I like to see which of these would provide the best alternate choice.

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  • Am I personally liable for bugs in medical software I've developed as an employee? [closed]

    - by user466406
    Some background: I'm employed at a small, Australia-based web agency that is dipping it's toe into Mobile Application development (iOS). The project that I'm working on provides a way for users to save medication dosage information which is sync'd with a backend server. Users must agree to ToS, Disclaimer etc before using the application. This is my first iOS application, and the project is currently over budget. As a result, management is not devoting the resources to Q&A and is pushing instead for more features. I am an employee of the agency, that has been contracted by a non-for-profit. The application will probably be released under our agency's name, but we also have the option of releasing it as the not-for-profit. My question is, if there are bugs found in the application, and as a result a user takes an incorrect dosage of a medication, am I personally liable? Is there anything that I can or should do in order to protect myself personally?

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  • Bridging the gap between learning language fundamentals and actually making useful software?

    - by Anonymous -
    I'm learning C# via the "Essential C#" Lynda.com video tutorials and plan to read a couple of books that cover things in more depth afterwards. My question is where I should head to learn more after that? I've done things like project Euler in the past, but I find they don't really help me learn anything other than basic program control flow and features. I've looked at many open-source projects but pretty much everything still looks overwhelmingly complicated at this stage. What would you recommend I look at to help me build useful applications that are a bit beyond the millions of console applications I must've written thus-far? Should I be looking at books specifically on learning/working with the .NET framework, or just biting my lip and continue working through open source projects until they start to make sense?

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  • Can software company claim the intellectual property rights on my paintings?

    - by maksymko
    This is somewhat related to this question. I'm about to sign a contract with a company that this sort of "all your base are belong to us" clause in it: it says that all programs, designs, sketches, drawings I create in relation to my job belong to the company. More or less usual stuff (unfortunately). What worries me, however, is this "drawings, sketches" thing, because I'm a hobby-artist and I paint and draw at my spare time. Can the company somehow claim ownership of intellectual rights on this work? Should I ask them to explicitly state that this clause does not extend to work of art or is this "in relation to the job" part is good enough?

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  • Where can I post software challenges and offer prizes as a way to outsource some work?

    - by r0u1i
    My apologies if this is off-topic, I thought this question suits this site better than stackoverflow. We have a few rather small and bounded problems in my company that we would love to outsource. Since they are very similar to challenges ("prove this and this can be done" rather than "supply the code"), we thought of posting them as challenges and offer prizes to the first guys who will crack them up. The outsourcing sites I know off (TopCoder, ODesk) are more interested in long term contracts with monthly pay. Is there a site better matching my needs out there?

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  • How to cope with "Hidden IT..." Who writes and maintains the ad-hoc software applications?

    - by matcauthon
    Bigger companies usually have the problem, that it is not possible to write all programs employees want (to save time and to optimize processes) due to a lack of staff and money. Then hidden programs will be created by some people having (at least some) coding experience (or by cheap students/interns...). Under some circumstances these applications will raise in importance and spread from one user to a whole department. Then there is the critical point: Who will maintain the application, add new features, ...? And this app is critical. It IS needed. But the intern has left the company. No one knows how it works. You only have a bunch of sources and some sort of documentation. How do you cope with these applications? Can you "forbid" them? Can you control them? Do you have to write all apps (not Excel macros or some minor stuff) in the IT department?

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