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• Hadoop on windows server

  - by Luca Martinetti

  Hello, I'm thinking about using hadoop to process large text files on my existing windows 2003 servers (about 10 quad core machines with 16gb of RAM) The questions are: Is there any good tutorial on how to configure an hadoop cluster on windows? What are the requirements? java + cygwin + sshd ? Anything else? HDFS, does it play nice on windows? I'd like to use hadoop in streaming mode. Any advice, tool or trick to develop my own mapper / reducers in c#? What do you use for submitting and monitoring the jobs? Thanks

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• Adhoc Data processing / ETL

  - by Dane

  I've just started at a new company in outsourced communications (e.g. print and mail, email, fax). One of the requirements is to process clients data and get it ready for mailing. For recurring jobs, this is easy using an ETL tool linked in with some addressing software, but for adhoc stuff it's a bit overkill. I've used inhouse developed stuff before (clunky but usable), but I don't want to have to re-develop that here. Any recommendations? Some features : Basic DBMS functionality (preferably with a proper DBMS backend for SQL support) Field concatenation (e.g. combine Firstname + Surname) "Pushing columns" (e.g. with address fields 1 - 8, push them left so if one is blank, the next one gets pushed up) Australia post mail sorting and dpid allocation (or can link into external tools relatively easily)

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• Alternative to zc.buildout that runs on Python3

  - by srid

  My project uses buildout to do primarily two things: automatically fetch dependencies and create scripts; and setup cron jobs (on deployment machines) using the usercrontab buildout recipe. But buildout is not yet available for Python 3. So I would like to consider alternatives for buildout. I know that both virtualenv and pip work on Python 3 - but what is the preferred tool to automate the build toolchain (of creating virtualenv, and automatically installing/upgrading deps)? There is fabric, paver, and so on. What is your preferred tool of choice in this case? It must work seamlessly on both Windows and *nix.

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• Should economics be taught to geeks?

  - by asksuperuser

  When I interview developers for jobs I'm really astonished by their lack of economics consciousness. It seems they think they'll be recruited just for technological fun. When you ask them for technical solutions they would just follow hypes from software editors without consideration for the economics part. I have rejected 80% of candidates just for that kind of reason. I don't know if other recruiters ask economics questions, but as for me that is one of the main criterias. That is why I prefer to enquiry by myself on technical questions because I just don't trust the geeks choice. So did you learn economics at school ? At mine yes and that did serve me.

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• Getting started in Mac Development; No Mac.... What Do?!

  - by Andrew Bolster

  Hi folks, With all the RDF et al around King Jobs' newest glass beermat, I'm getting the feeling that its a good time to add the 'iphone/ipad developer' string to my bow. One problem (two if you count not being in a financial position to slap down $1000+ for a mac) ; I am a PC head, specifically a Linux-head, and have no regular access to a Mac platform to develop on. I cannot see any way of getting my hands on iSDK without being on a Mac, (but have been known to be wrong) How hopeless is my plight and where can I go from here?

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• What kinds of job scheduler framework or solution do you recomend on window server system

  - by Samuel.P

  Hi Guys My Company is running a lots of batch jobs to process data for partners. We used to use sql server agent to execute batch process. I found it's very difficult to get batch process information like log or status when i working on sql server's agent. So I'd like to change my company's job scheduling process to another stable solution But I dind't know which solutions to choose. I tried to find as same solution as CA Autosys. My Company use window server system. We shoud consider framework or solution should be configured using solution's api because i plan to make a asp.net web application to manage our job shceduler. What kinds of job scheduler Framework or inexpensive solution do you suggest? Regards, Park PS: I think Quartz Framework has a good reputation on J2EE system. But I am not sure Quartz.NET is as good as orginal java version.

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• Correct Response For Questions Regarding Lack Of College Degree

  - by rofly

  I've managed to land two programming jobs so far with a partial college degree. One was an internship/co-op type position that turned full-time, while the other is contract work I've received mainly via circumstance. I have an interview forthcoming (my roommate works at the company) and they have already asked him why I have not completed my degree. The real reason is purely financial, but I was going to ask the SO community if there was any way I could spin this disadvantage to make it look more favorable. So, Stack Overflow: How can I look less like a slacker given the circumstances?

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• Is there a DRMAA Java library that works with Torque/PBS?

  - by dondondon

  Does anybody know a Java implementation of the DRMAA-API that is known to work with PBS/Torque cluster software? The background behind this: I would like to submit jobs to a newly set-up linux cluster from java using a DRMAA compliant API. The cluster is managed by PBS/Torque. Torque includes PBS DRMAA 1.0 library for Torque/PBS that contains a DRMA-C binding and provides in libdrmaa.so and .a binaries. I know that Sun grid engine includes a drmaa.jar providing a Java-DRMAA API. In fact I opted to use SGE but it was decided to try PBS first. The theory behind that decision was: 'DRMAA is a standard and therefore a Java API needs only a standards compliant drmaa-c binding.' However, I couldn't find such 'general DRMAA-C-java API' and now assume that this assumption is wrong and that the Java libraries are engine specific. Are we stuck here? Any comments appreciated.

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• Generic Method to find the tuples used for computation in Postgres?

  - by Rahul

  If I have a table col1 | name | pay ------+------------------+------ 1 | Steve Jobs | 1006 2 | Mike Markkula | 1007 3 | Mike Scott | 1978 4 | John Sculley | 1983 5 | Michael Spindler | 1653 The user executes a sum query which sums the pay of people getting paid more than $1500. Is there a way to also implicitly know which tuples have been used which satisfy the condition for sum ? I know you can separately write another query to just return the primary key ids which satisfy the condition. But, Is there any other way to do that in the same query ? probably rewrite the query in some way ? or... any suggestion ?

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• reading job requirements

  - by Kaiynat Naz

  Hi Frins, I'd like to read an advertisement for the job through my program. Initially i am working on the templates provided by the microsoft word as "Job Description". Basically I have to extract the requirements of jobs like required education, skills or any development tools etc. I'd store these requirements in the database and then further use these in my application. Simply I dont know how to do this efficiently as I'd like to ignore articles, pronouns and so on... I am developing my application in VC#. Kindly help me... :'( Regards Kaiynat Naz

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• Hudson XML error-- No module named dom.minidom

  - by Arnab Sen Gupta

  I am trying to send a simple XML file of the format given in http://wiki.hudson-ci.org/display/HUDSON/Monitoring+external+jobs . I was able to send it easily and was getting desired result!! Then I tried to build this XML file using python script and it was giving me the exact file that I wanted without any problem. But when I tried to run this and send it to Hudson, I was getting the error - "No module named dom.minidom" . I checked again by executing in Python IDLE and it ws working fine but when I tried to send it again, I was getting the same error.. plz help..

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• Kohana 3 and CRON always accessing index.php (not following the URI argument)

  - by alex

  OK, I hope this is my last question about CRON jobs and Kohana 3. Note: others are not duplicates, just other problems. Here is my CRON job (setup in cPanel) php /home/user/public_html/index.php --uri=properties/update As per this answer. I have set it up so it emails me the output. It is running every 5 mins. Unfortunately, it always emails me the source of the home page of my site (index.php or /). I can access that URL fine in my browser, i.e. http://www.example.com/properties/update and it works and does it's job correctly. I can tell the Cron is never hitting the script because I have a file logger in place. Would this have anything to do with .htaccess? Has this happened to anyone before, and how did they fix it? Many thanks.

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• How to Avoid Maven builds stall on ssh host authenticity problem?

  - by Peter Kahn

  What's the right way to keep ssh host authenticity from being a problem for maven and hudsno builds? I have hudson building my maven project on a VM. When the ESX server with my VMs on it is taxed some of my jobs will stall out stuck in a loop of ssh host authenticity problems. The hosts were in the known hosts file, but during these times the clocks on the slave VMs have drifted far from those of my maven repo. [INFO] Retrieving previous build number from snapshots The authenticity of host 'maven.mycorp.com' can't be established. DSA key fingerprint is 6d:....83. Are you sure you want to continue connecting? (yes/no): The authenticity of host 'maven.mycorp.com' can't be established. Is there something other than disabling host checking (CheckHostIP no)?

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• kill -9 and production application

  - by valodzka

  Which problem can cause kill -9 in production application (in linux to be exact)? I have application which do some periodical work, stopping these takes long time, and I don't care if some jobs will be aborted - work can be finished by new processes. So can I use kill -9 just to stop it immediately or this can cause serious OS problems? For example, Unicorn, uses it as normal working procedure: When your application goes awry, a BOFH can just "kill -9" the runaway worker process without worrying about tearing all clients down, just one. But this article claims: The -9 (or KILL) argument to kill(1) should never be used on Unix systems

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• Which tool / technology: System management for databases and dependent services

  - by Filburt

  A follow-up on this system management question: Since I probably will not get much feedback on serverfault I'll give it a try here. My main concern is to reflect the dependencies between the databases, services ans tasks/jobs I'll have to manage. Besides considering Powershell, I even thought about using MSBuild because it would allow for modeling dependencies and reuse configuration targets. In other words: What technology should I use to develop a flexible solution that will allow me to stop service A, B and C on machine D in the right order and disable task E on machine F when taking down database X?

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• How to Prove that using subselect queries in SQL is killing performance of server

  - by adopilot

  One of my jobs it to maintain our database, usually we have troubles with lack of performance while getting reports and working whit that base. When I start looking at queries which our ERP sending to database I see a lot of totally needlessly subselect queries inside main queries. As I am not member of developers which is creator of program we using, they do not like much when I criticize they code and job. Let say they do not taking my review as serious statements. So I asking you few questions about subselect in SQL Does subselect is taking a lot of more time then left outer joins? Does exists any blog, article or anything where I subselect is recommended not to use ? How I can prove that if we avoid subselesct in query that query is going to be faster ? Our database server is MSSQL2005

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• why do we all learn and study java or .net or why java or .net are popular?

  - by tadeze

  My question to be clear is why do we all need to learn java or .net(C#) , still java or .net are more popular than delphi or c++ and even there are lot of resource,articles or books compared to c++ or delphi about java and .net. However, I heard majority, if I am right about 80% of software are developed using c++ or delphi in the software industry. so, why do we bother about other languages specifically about the cosmopolitan languages such as java or .net in education as well as for job interview. Although, still I know the elegance of java and .net, their safe code execution,fully objected oriented behavior ...etc, but still according to the statics they are not preferred on software develpement as a primary language mainly because of their execution time compared to c++ or delphi. So my question are why do they choose them for jobs or educational purpose and everything else? why do we lose our time learning these language if we are forced to use the other languages in the industry?

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• What are the best uses for each programming language?

  - by VirtuosiMedia

  I come from a web developer background, so I'm fairly familiar with PHP and JavaScript, but I'd eventually like to branch out into other languages. At this point, I don't have a particular direction or platform that I'm leaning toward as far as learning a new language or what I would use it for, but I would like to learn a little bit more about programming languages in general and what each one is used for. I've often heard (and I agree) that you should use the right tool for the job, so what jobs are each programming language best suited for? Edit: If you've worked with some of the newer or more obscure languages, please share for those as well.

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• TypeError: Python thinks that I passed a function 2 arguments but I only passed it 1

  - by slhck

  I work on something in Seattle Repy which is a restricted subset of Python. Anyway, I wanted to implement my own Queue that derives from a list: class Queue(list): job_count = 0 def __init__(self): list.__init__(self) def appendleft(item): item.creation_time = getruntime() item.current_count = self.job_count self.insert(0, item) def pop(): item = self.pop() item.pop_time = getruntime() return item Now I call this in my main server, where I use my own Job class to pass Jobs to the Queue: mycontext['queue'] = Queue() # ... job = Job(str(ip), message) mycontext['queue'].appendleft(job) The last line raises the following exception: Exception (with type 'exceptions.TypeError'): appendleft() takes exactly 1 argument (2 given) I'm relatively new to Python, so could anyone explain to me why it would think that I gave appendleft() two arguments when there obviously was only one?

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• Do employers like to see (programming/computer science) blogs?

  - by incrediman

  I'm wondering if having a blog (with most posts concentrating on computer science/programming) would be a good idea with regards to getting a job. Would a potential employer like to see something like that? What about someone hiring a freelancer? I'd especially appreciate: Responses from people who hire programmers or computer scientists for full-time jobs. Responses from people who hire freelance programmers. Responses from people who have such such blogs and have felt their (either negative or positive) effects. Thanks! I felt this would probably be best marked as community wiki - please let me know if I was mistaken.

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• Resources to learn about engineering aspects of data analytics (OLAP, warehousing, ETL, etc.)

  - by JT

  I'm a math/stats guy, interested in learning more about the engineering aspects of "data analytics" (this may be an overly broad term, this is a case of "I don't know what I don't know", so I'm not sure how to be more specific). I'm fine with manipulating and analyzing the data once it's already stored somewhere and I can access it, and I'm fine with writing scripts and SQL queries (and have a general knowledge of things like normalization). What I don't know is the whole engineering process of capturing and storing the data. For example, terms I've heard thrown about that I only vaguely understand the meaning of include: - OLAP, OLTP - Data warehousing - ETL - ??? What's a good book (or any other resource) to learn about these kinds of things? What are things I should know about database design (normalization seems kinda "obvious" to me, something I would have done even before I knew the term -- is there anything else?)? In other words, for jobs falling under the umbrella term of "analytics engineer", what kinds of things should I know?

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• Is there an implementation of rapid concurrent syntactical sugar in scala? eg. map-reduce

  - by TiansHUo

  Passing messages around with actors is great. But I would like to have even easier code. Examples (Pseudo-code) val splicedList:List[List[Int]]=biglist.partition(100) val sum:Int=ActorPool.numberOfActors(5).getAllResults(splicedList,foldLeft(_+_)) where spliceIntoParts turns one big list into 100 small lists the numberofactors part, creates a pool which uses 5 actors and receives new jobs after a job is finished and getallresults uses a method on a list. all this done with messages passing in the background. where maybe getFirstResult, calculates the first result, and stops all other threads (like cracking a password)

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• Zend Framework command line see errors

  - by sims

  I'm using a method outline by gregor (http://stackoverflow.com/questions/143320/create-cronjob-with-zend-framework) to create command line execution for parts of my application such as cron jobs, admin tasks, and the like. It works, however, no errors get reported when I create a new object that has not been defined (misspelling) and other such mistakes. I would have thought that php would report an error, but it fails silently. What is the reason for this? Is there a better way to achieve my goal? Or how can I implement this so that I can see errors? Many thanks! Here is the code: in public/index.php if(!defined('RUN_APP') || RUN_APP == true) { $application->bootstrap()->run(); } application/cron.php define("RUN_APP",false); require(realpath('/var/www/domain/public/index.php')); $application->bootstrap(); //the rest

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• Override Java System.currentTimeMillis

  - by Mike Clark

  Is there a way, either in code or with JVM arguments, to override the current time, as presented via System.currentTimeMillis, other than manually changing the system clock on the host machine? A little background: We have a system that runs a number of accounting jobs that revolve much of their logic around the current date (ie 1st of the month, 1st of the year, etc) Unfortunately, a lot of the legacy code calls functions such as new Date() or Calendar.getInstance(), both of which eventually call down to System.currentTimeMillis. For testing purposes, right now, we are stuck with manually updating the system clock to manipulate what time and date the code thinks that the test is being run. So my question is: Is there a way to override what is returned by System.currentTimeMillis? For example, to tell the JVM to automatically add or subtract some offset before returning from that method? Thanks in advance!

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• JavaScript socket vs. Flash socket?

  - by Dr.Dredel

  Steve Jobs just posted this article on why Apple rejects Flash... http://www.apple.com/hotnews/thoughts-on-flash/ I agree that javascript and css can be used to replicate some of Flash's animation, though Flash does all sorts of scaling and tweening that is incredibly powerful, and I'm not sure that there's anything comparable in javascript, if there is, I certainly haven't seen it. However, my question is about the socket. Flash has an incredibly powerful openSocket class that allows you to connect to a server and have the server and the client talk back and forth to one another. As far as I know there is no equivalent class in Javascript. Am I mistaken? Is there some secret mystery Ajax class that replicates the openSocket? If not, then that feature alone makes Flash an invaluable tool. I'm interested in all answers though... and yes this IS a programming question! :)

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