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  • MapReduce programming system in java-actionscript

    - by eco_bach
    Just finished reading ch23 in the excellent 'Beautiful Code' http://oreilly.com/catalog/9780596510046 on Distributed Programming with MapReduce. I understand that MapReduce is a programming system designed for large-scale data processing problems, but I have a hard time getting my head around the basic examples given and how I might apply them in real world situations. Can someone give a simple example of MapReduce implemented using either java, javascript or actionscript?

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  • How does your team work together in a remote setup?

    - by Carl Rosenberger
    Hi, we are a distributed team working on the object database db4o. The way we work: We try to program in pairs only. We use Skype and VNC or SharedView to connect and work together. In our online Tuesday meeting every week (usually about 1 hour) we talk about the tasks done last week we create new pairs for the next week with a random generator so knowledge and friendship distribute evenly we set the priority for any new tasks or bugs that have come in each team picks the tasks it likes to do from the highest prioritized ones. From Tuesday to Wednesday we estimate tasks. We have a unit of work we call "Ideal Developer Session" (IDS), maybe 2 or 3 hours of working together as a pair. It's not perfectly well defined (because we know estimation always is inaccurate) but from our past shared experience we have a common sense of what an IDS is. If we can't estimate a task because it feels too long for a week we break it down into estimatable smaller tasks. During a short meeting on Wednesday we commit to a workload we feel is well doable in a week. We commit to complete. If a team runs out of committed tasks during the week, it can pick new ones from the prioritized queue we have in Jira. When we started working this way, some of us found that remote pair programming takes a lot of energy because you are so focussed. If you pair program for more than 5 or 6 hours per day, you get drained. On the other hand working like this has turned out to be very efficient. The knowledge about our codebase is evenly distributed and we have really learnt lots from eachother. I would be very interested to hear about the experiences from other teams working in a similar way. Things like: How often do you meet? Have you tried different sprint lengths (one week, two week, longer) ? Which tools do you use? Which issue tracker do you use? What do you do about time zone differences? How does it work for you to integrate new people into the team? How many hours do you usually work per week? How does your management interact with the way you are working? Do you get put on a waterfall with hard deadlines? What's your unit of work? What is your normal velocity? (units of work done per week) Programming work should be fun and for us it usually is great fun. I would be happy about any new ideas how to make it even more fun and/or more efficient.

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  • Is there a standard dialog for constructing an ADO.Net connection string (that is redistributable)?

    - by rathkopf
    I want to use a standard dialog to solicit user input of an ADO.net connection string. It is trivial to do for the oledb connection string as described here: MSDN Article on MSDASC.DataLinks().Prompt I've also found examples that use Microsoft.Data.ConnectionUI.dll and MicrosoftData.ConnectionUI.Dialog.dll from VS (HOWTO: Using the Choose Data Source dialog of Visual Studio 2005 from your own code). Unfortunately these DLLs are not licensed for redistribution. Is there a standard dialog for choosing a data source that can be distributed with my application?

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  • JavaScript/JSON Serializer

    - by Water Cooler v2
    I see that a JSON serializer is present in the System.Web.Script.Serialization namespace, and is shipped in the System.Web.Extensions.dll assembly. Is this assembly distributed with the .NET framework v4.0 redistributable? Is it also guaranteed to be present on a user's machine if any edition of Visual Studio 2010 is installed?

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  • Accessing Erlang business layer via REST

    - by Polyn
    For a college project i'm thinking of implementing the business layer in Erlang and then accessing it via multiple front-ends using REST. I would like to avail of OTP features like distributed applications, etc. My question is how do I expose gen_server calls/casts to other applications? Obviously I could make RPC calls via language specific "bridges" like OTP.net or JInterface, but I want a consistent way to access it like REST.

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  • How to choose between UUIDs, autoincrement/sequence keys and sequence tables for database primary keys?

    - by Tim
    I'm looking at the pros and cons of these three primary methods of coming up with primary keys for database rows. So assuming I am using a database that supports more than one of these methods, is there a simple heuristic to determine what the best option would be for me? How do considerations such a distributed/multiple masters, performance requirements, ORM use, security and testing have on the choice? Any unexpected drawbacks that one might run into?

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  • Mercurial Workflow for small team

    - by Tarski
    I'm working in a team of 3 developers and we have recently switched from CVS to Mercurial. We are using Mercurial by having local repositories on each of our workstations and pulling/pushing to a development server. I'm not sure this is the best workflow, as it is easy to forget to Push after a Commit, and 3 way merge conflicts can cause a real headache. Is there a better workflow we could use, as I think the complexity of distributed VC is outweighing the benefits at the moment. Thanks

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  • How and/or Why is Merging in GIT Better than in SVN?

    - by John
    I've heard a few places that one of the main ways distributed version control systems shine, is much better merging than traditional tools like SVN. Is this actually due to inherent differences in how the two systems work, or do specific DVCS implementations like GIT/Mercurial just have cleverer merging algorithms than SVN?

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  • Which logging library to use for cross-language (Java, C++, Python) system

    - by recipriversexclusion
    I have a system where a central Java controller launches analysis processes, which may be written in C++, Java, or Python (mostly they are C++). All these processes currently run on the same server. What are you suggestions to Create a central log to which all processes can write to What if in the future I push some processes to another server. How can I support distributed logging? Thanks!

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  • parallel sorting methods

    - by davit-datuashvili
    in book algorithm in c++ by robert sedgewick there is such kind of problem how many parallel steps would be required to sort n records that are distributed on some k disks(let say k=1000 or any value ) and using some m processors the same m can be 100 or arbitrary number i have questions what we should do in such case? what are methods to solve such kind of problems? and what is answer in this case?

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  • C++ application as a service with high performance

    - by sand
    I need to provide a C++ application as a service. Client of the service and the service can be on the same machine or distributed on different machines based on the load. This application takes a ~2KB string as input and returns almost similar size of string after some processing. Turnaround time for the client should be really quick. What is the best mechanism to implement this?

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  • What binary architectures should be cross-compiled when building Mac OS X packages?

    - by Alex Leach
    Currently, Apple's native binaries and libraries are distributed as fat files, with support for both i386 and x86_64 architectures. The SDK (Xcode 4.4 w/ command line tools) doesn't support cross-compiling powerpc binaries any more, so they can be safely ignored I think, but there doesn't seem to be any specific guidelines or recommendations about which Intel architectures to support. So, when compiling code for distribution on OS X, do people still cross-compile for the i386 architecture? Or are x86_64 binaries the only architecture worth bothering with nowadays?

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  • Filesize checks for integrity checks

    - by atwellpub
    Hey I'm wanting to have an integrity check on a software that will be distributed to many different types of servers. Can I use PHP's filesize() comparisons safely... for example will a filesize that is 745 on my server be 745 across all other servers?

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  • Exiting full screen mode in Flash

    - by OleK
    I am working on a flash game, that will be distributed as and EXE file. I would very much like the game to run full screen, which is not a problem, but I am struggling with replacing flash default behavior when escape is pressed. When escape is pressed I would like to display a custom menu asking the user if they want to exit the game or continue playing, not just exit full screen more. Is this possible in Flash?

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  • What areas of computer science are particularly relevant to mobile development?

    - by MalcomTucker
    This isn't a platform specific question - rather I'm interested in the general platform independent areas of computer science that are particularly relevant to mobile applications development. For example, things like compression techniques, distributed synchronisation algorithims etc.. what theoretical concepts have you found relevant, useful or enabling when building mobile apps?

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  • How to get a random node from a tree?

    - by ooboo
    It looks easy, but I found the implementation tricky. I need that for a simple genetic programming problem I'm trying to implement. The function should, given a node, return the node itself or any of its children such that the probability of choosing a node is normally distributed relative to its depth (so the function should return mostly middle nodes, but sometimes the root itself or the lowest ones - but that's not really necessary if that makes it significantly more complex, if all any node is chosen with equal probability, that's good enough). Thanks

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  • How to find header dependencies for large scale projects on linux

    - by user12371
    I'm working an a very large scale projects, where the compilation time is very long. What tools can I use (preferably open source) on Linux, to find the most heavily included files and that optimize their useages? Just to be clearer, I need a tool which will, given the dependencies, show me which headers are the most included. By the way, we do use distributed compiling

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  • Openquery - unable to begin a distrubuted transaction

    - by dc2
    I am trying to use open query to run a stored procedure in a remote database, and insert it into a table in my local database: -- this works exec remotesvr.sys.dbo.golden_table 'some', 'parameters' While the above works out, I try the following: insert into my_local_table exec remotesvr.sys.dbo.golden_table 'some', 'parameters' I get a SQL error to the effect of 'unable to begin a distributed transaction'. Is there any way around this?, i.e. can I execute take the results of a remote stored procedure and put its contents in a local table?

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