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  • Hadoop write directory

    - by FaultyJuggler
    Simple question but reading through documentation and configuration I can't quite seem to figure it out. How do I A) know where hadoop is writing to on the local disk and B) change that For initial testing I setup HDFS on a 20gb linux VM - to it we've added a 500gb networked drive for moving towards prototyping the full system. So now how do I point HDFS at that drive, or do I simply move the home directory/install with some slight change in setup and restart the process?

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  • Scala: can't write setter without getter?

    - by IttayD
    This works: class ButtonCountObserver { private var cnt = 0 // private field def count = cnt // reader method def count_=(newCount: Int) = cnt = newCount // writer method // ... } val b = new ButtonCountObserver b.count = 0 But this doesn't class ButtonCountObserver { private var cnt = 0 // private field def count_=(newCount: Int) = cnt = newCount // writer method // ... } val b = new ButtonCountObserver b.count = 0 I get: error: value count is not a member of ButtonCountObserver Is it possible to create a setter (with the syntactic sugar) without a getter?

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  • How do you protect your <appid>.appspot.com domain from DDOS attack?

    - by jacob
    If I want to use CloudFlare to help protect my GAE app via it's custom domain, I still am vulnerable to attacks directly on the .appspot.com domain. How do I mitigate that? I could force redirect appspot.com host requests, such as discussed here: http://stackoverflow.com/questions/1364733/block-requests-from-appspot-com-and-force-custom-domain-in-google-app-engine/ But I would still suffer the load of processing the redirect in my app. Are there any other solutions?

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  • Write the longest possible loop.

    - by Abhay
    Hello Group, Recently I was asked this question in a technical discussion. What is the longest possible loop that can be written in a programming language? This loop has to be as long as possible and yet not an infinite loop and should not end-up crashing the program (Recursion etc...) I honestly did not know how to attack this problem, so I asked him if is it practically possible. He said using some computer science concepts, you can arrive at a hypothetical number which may not be practical but nevertheless it will still not be infinite. Anyone here; knows how to analyse / attack this problem. P.S. Choosing some highest limit for a type that can store the highest numerical value is apparently not an answer. Thanks in advance,

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  • how to write regular expression to validate a string using regex in C#

    - by Charu
    I need to validate a user input based on condition. i wrote a regular expression to do so, but it's failing not sure why. Can somebody point where i am making mistake? Regex AccuracyCodeHexRegex = new Regex(@"^[PTQA]((0|8)[01234567]){2}$"); This is what i am trying to validate(If the string is a subset of these strings then it is valid): Phh, Thh, Qhh, Ahh where 'h' is a hex digit in the set {00, 80, 01, 81, 02, 82, 03, 83, 04, 84, 05, 85, 06, 86, 07, 87} Ex: P00 is valid P20 is not valid

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  • Sqllite doesn' write a column

    - by user1904675
    I do this: DatabaseHelper dbHelper = new DatabaseHelper(context); dbHelper.getWritableDatabase(); String sql = "insert into "+getTableName()+("+DatabaseHelper.PRODUCT_MARK+","+DatabaseHelper.PRODUCT_NAME+") VALUES ('"+input.getMark()+"','"+input.getName()+"')"; System.out.println(sql); getDatabase().execSQL(sql); dbHelper.close(); The system print 12-14 16:53:33.857: I/System.out(1350): insert into product (pMark,name) VALUES ('aaaaa ','zz') But when I read from db the property mark is not valorized... Where is my mistake?

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  • Synchronize write to two collections

    - by glaz666
    I need to put some value to maps if it is not there yet. The key-value (if set) should always be in two collections (that is put should happen in two maps atomically). I have tried to implement this as follows: private final ConcurrentMap<String, Object> map1 = new ConcurrentHashMap<String, Object>(); private final ConcurrentMap<String, Object> map2 = new ConcurrentHashMap<String, Object>(); public Object putIfAbsent(String key) { Object retval = map1.get(key); if (retval == null) { synchronized (map1) { retval = map1.get(key); if (retval == null) { Object value = new Object(); //or get it somewhere synchronized (map2) { map1.put(key, value); map2.put(key, new Object()); } retval = value; } } } return retval; } public void doSomething(String key) { Object obj1 = map1.get(key); Object obj2 = map2.get(key); //do smth } Will that work fine in all cases? Thanks

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  • Write an xml file from the specified node?

    - by Googler
    Hi all, This is my xml file Input: <world> <patent> <xml>a</xml> <java>333</java> <jaxb>111</jaxb> </patent> </world> I need the read the above xml file and reproduce the following the output Output: <patent> <xml>a</xml> <java>333</java> <jaxb>111</jaxb> </patent> I dont need the world element. How to achieve this using Xpath. Can anyone help me on this?

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  • .Net OpenXml - Write Word 2007 document

    - by Melursus
    My problem is in two parts. 1. First part How can I, in Word 2007, put an id on a section so I can easy access this section from my code ? Let say I got Name : Here I want to set the name from my c# code 2. Second part How can I, from my c# code, fill this section id ?

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  • Can I write this JQuery statement cleaner?

    - by Polaris878
    Hello, So I have the following: var box = $(".MyCheckBox"); if (box[0].checked) { // Do something } else { // Do something else } Is there a better way of doing this using filters or something? I know I can go: $(".MyCheckBox") .filter(function(index) { return this.checked; }) .each(function() { // do something }); But I need to do something in the else statement... easier way of doing this? Thanks!

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  • Write a serverside c++/openGL App, that is accessible via JavaScript

    - by moka
    Hi, I am currently having an idea where I want to save an image from a c++/openGL application on demand from a browser. So basically I would like to run the application itself on the server and have a simple communication layer like this: JS - tell application to do calculations (and maybe pass a string or some simple data) application - tell JS when finished and maybe send a link, text or something as simple as that. I don't really have alot of experience with webservers and as such don't know if that is possible at all (it's just my naive thinking). And note: I am not talking about a webGL application, I just want to have simple communication between a c++ serverside application, and the user. Any ideas how to do that? Thanks alot!

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  • Write a row to Google Spreadsheet programmically javascript

    - by Verber
    I'm trying to find a way to insert a row into a google spreadsheet dynamically. I have a list of objects that has all the data for every column in a row. I'm just trying to run a for loop and then send the data to the row in the spread sheet. But the spreadsheet is completely empty. So I don't know if that creates certain problems or not. for(var j=0; j < masterList.length; j++) { //tried this one but it didn't pan out sheet.appendRow([ masterList[j].Date, masterList[j].Name, masterList[j].Bugs, masterList[j].Enhancements, masterList[j].Epic, masterList[j].DevOps, masterList[j].High ]); }

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  • Django: How to write the reverse function for the following

    - by ninja123
    The urlconf and view is as follows: url(r'^register/$', register, { 'backend': 'registration.backends.default.DefaultBackend' }, name='registration_register'), def register(request, backend, success_url=None, form_class=None, disallowed_url='registration_disallowed', template_name='registration/registration_form.html', extra_context=None): What i want to do is redirect users to the register page and specify a success_url. I tried reverse('registration.views.register', kwargs={'success_url':'/test/' }) but that doesn't seem to work. I've been trying for hours and can't get my mind around getting it right. Thanks

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  • Best way to write an image to a Django HttpResponse()

    - by k-g-f
    I need to serve images securely to validated users only (i.e. they can't be served as static files). I currently have the following Python view in my Django project, but it seems inefficient. Any ideas for a better way? def secureImage(request,imagePath): response = HttpResponse(mimetype="image/png") img = Image.open(imagePath) img.save(response,'png') return response (Image is imported from PIL.)

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  • How can I write this shorter? c#

    - by nLL
    public static string GetUa(HttpRequest hr) { try { string visitorBrowser = hr.UserAgent.ToString(); string originalBrowser = hr.ServerVariables["X-OperaMini-Phone-UA"]; string anotherOriginalBrowser = hr.ServerVariables["X-Device-User-Agent"]; //novarra if (!String.IsNullOrEmpty(originalBrowser)) { return "OPERAMINI " + originalBrowser; } else { if (!String.IsNullOrEmpty(anotherOriginalBrowser)) { return "NOVARRA " + anotherOriginalBrowser; } else { return visitorBrowser; } } } catch { return "No UA Found"; } }

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  • How can I write this shorter?

    - by nLL
    public static string GetUa(HttpRequest hr) { try { string visitorBrowser = hr.UserAgent.ToString(); string originalBrowser = hr.ServerVariables["X-OperaMini-Phone-UA"]; string anotherOriginalBrowser = hr.ServerVariables["X-Device-User-Agent"]; //novarra if (!String.IsNullOrEmpty(originalBrowser)) { return "OPERAMINI " + originalBrowser; } else { if (!String.IsNullOrEmpty(anotherOriginalBrowser)) { return "NOVARRA " + anotherOriginalBrowser; } else { return visitorBrowser; } } } catch { return "No UA Found"; } }

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  • How to write back to database from Silverlight?

    - by Manoj
    Hi, I use LINQ to SQL to get data from a database and use a service contract to access it in Silverlight at the client side. I display the data in a DataGrid. Now how do I make sure that any changes in the datagrid is written back to the database? EDIT: This is the example code I implemented: http://www.silverlight.net/learn/tutorials/sqldatagrid-cs/ Here I wanted any change in the datagrid reflected back in the database. The SubmitChanges function works in the DataContext object which is: public partial class DataClasses1DataContext : System.Data.Linq.DataContext But this is not exposed in the contract and so not visible in the client side code.

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  • Write an expression in javascript

    - by Hero
    hi everybody... I need a javascript code that split a string like below: Input string: "a=aa| b=b||b | c=cc" Output: a=>aa b=>b||b c=>cc I'd written different codes like: split(/ \ | /) or Split(/ \| (?! \ |) /) but didn't work. please help me... I really need it fast.

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  • How do I best write my own background-working and communicatible (sending progress updates and getti

    - by Ivan
    I have to develop a class which can run it's own hard-coded task in a background thread and communicate with container class sending him progress updates and taking messages from it. I believe I am going to extend BackgroundWorker class but it looks a bit weird to extend and I haven't managed to find a good example wit Google. Can you share a link to a good example of solving such a task? Please don't offer placing a BackgroundWorker visually on a form and reading the standard tutorial, it's not for my case. Maybe I'd better not extend but encapsulate a BackgroundWorker, but I hardly understand how to use it outide WinForms designer either :-(

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  • Google App Engine/Simple HTML, how to write input boxes with google autocomplete

    - by Calm Storm
    I am writing a GAE application and I would like to have an input box with google auto-suggest. Specifically, when a user types "Shawshank" I would like to see google's suggestions in my drop down. Can someone tell me what are the different ways of doing this? I understand I may have to use some javascript libraries so any code samples etc will help immensely. (Pure javascript/jquery kinda solutions will be more preferable)

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  • How do you write a recursive stored procedure

    - by Grayson Mitchell
    I simply want a stored procedure that calculates a unique id and inserts it. If it fails it just calls itself to regenerate said id. I have been looking for an example, but cant find one, and am not sure how I should get the sp to call itself, and set the appropriate output parameter. I would also appreciate someone pointing out how to test this sp also. ALTER PROCEDURE [dbo].[DataContainer_Insert] @SomeData varchar(max), @DataContainerId int out AS BEGIN -- SET NOCOUNT ON added to prevent extra result sets from -- interfering with SELECT statements. SET NOCOUNT ON; BEGIN TRY SELECT @UserId = MAX(UserId) From DataContainer INSERT INTO DataContainer (UserId, SomeData) VALUES (@UserId, SomeData) SELECT @DataContainerId = scope_identity() END TRY BEGIN CATCH --try again exec DataContainer_Insert @DataContainerId, @SomeData END CATCH END

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