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  • Is Cassandra database row size limited by available memory?

    - by Adam Hollidge
    I'm working with very long time series -- hundreds of millions of data points in one series -- and am considering Cassandra as a data store. In this question, one of the Cassandra committers (the über helpful jbellis) says that Cassandra rows can be very large, and that column slicing operations are faster than row slices, hence my question: Is the row size still limited by available memory?

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  • Solr OR query for different combination of facets

    - by Ritesh M Nayak
    I have a sample Solr schema as follows isPublic = boolean source = facebook| twitter | wordpress I want to write a query which returns all documents from the index which matches either the isPublic = true or isPublic is false and source= facebook. Something like this solrUrl/?q=blah&fq=(isPublic:true OR (isPublic:false AND source:facebook)) Is such a thing possible or should I search the index two times with each of these conditions and then combine + de-duplicate the results?

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  • Call C (exposed) function from COBOL program

    - by Sunscreen
    Hi, Some time ago, I had created a DLL to be used in another C program. Basically I exposed specific functions by using the following within my dll: void __declspec(dllexport) MyFunc(myFirstArg, mySecondArg); Then I added an external file (MyExposedDll.h) with all exposed functions and structures to the new C program and included it: include MyExposedDll.h Now how can I use this dll (or mainly a dll) to a Cobol function? I need to expose a function that has two char* arguments and returns a boolean. Thanks, Sun

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  • Use .net reactive in silverlight to generate multiple events.

    - by Mrt
    I have a method in a silverlight application. I want to start calling this method when an event occurs (mouse move), and continue to call this method every 1 second until a simple boolean condition changes. Is this possible ? I can't work out how to get the rx to generate multiple 'events' from the single event

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  • Query having 2 Where Clause

    - by Harsha M V
    i am trying to login and want to validate username and password against the records in the database. I am not sure how to pass two Where clause public Boolean login(String username, String password) throws SQLException { Cursor mCursor = db.query(TABLE_USERS, new String[] { ID, KEY_NAME, KEY_USERNAME}, KEY_USERNAME + "=" + "'"+username+"'", KEY_PASSWORD + "=" + "'"+password+"'", null, null, null, null, null); if (mCursor.moveToFirst()) { return true; } return false; } Am getting a Syntax Error.

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  • How do I set a static bool in another app domain?

    - by Martin
    How do I programatically set the value of a static boolean in another app domain? I'm testing an application where I need to change a bool value. Problem is that the bool value exists as a static instance on a type hosted in another app domain. (I'm doing this for test purposes, it won't be used in production code)

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  • ODBC: how to handle Booleans?

    - by mawg
    Disclaimer: I am a n00b. It seems like ODBC does not support a BOOLEAN type? Is this true? If so, what's the standard kludgearound? Edit: I am using ADO with Delphi on Windows to write the data, but PHP 5 to read it back.

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  • Google App Engine - The most awaited feature

    - by systempuntoout
    This list is taken from the official Google App Engine roadmap: SSL for third-party domains Background servers capable of running for longer than 30s Ability to reserve instances to reduce application loading overhead Ability to select different availability vs. latency options for Datastore Support for mapping operations across datasets Datastore dump and restore facility Raise request/response size limits for some APIs Improved monitoring and alerting of application serving Support for Browser Push (Comet) communication Built-in support for OAuth & OpenID What is your most awaited feature and why?

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  • Knowing the type of the stored proc when invoking from C#

    - by dotnetdev
    I am making a windows service to be able to run operations on a sql server database (insert, edit, etc) and invoke Stored Procs. However, is there a way for me to know the type of the SP? When invoking from C#, I need to knof if it is returning 1 value, or more, or none (so I can use executereader, scalar, etc)? Thanks

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  • Allow user to only input text?

    - by Michael Quiles
    how do I make a boolean statement to only allow text? I have this code for only allowing the user to input numbers but ca'nt figure out how to do text. bool Dest = double.TryParse(this.xTripDestinationTextBox.Text, out Miles); bool MilesGal = double.TryParse(this.xTripMpgTextBox.Text, out Mpg); bool PriceGal = double.TryParse(this.xTripPricepgTextBox.Text, out Price);

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  • Android @Override usage

    - by BahaiResearch.com
    (Newbie to Java, old time C# guy.) I have noticed a lot of the use of @Override in Android example code. I thought that all Java methods were by default "Virutal"? What then does @Override do? Example: private class HelloWebViewClient extends WebViewClient { @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { view.loadUrl(url); return true; } }

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  • Can I pass a pointer to a superclass, but create a copy of the child?

    - by Alex
    I have a function that takes a pointer to a superclass and performs operations on it. However, at some point, the function must make a deep copy of the inputted object. Is there any way I can perform such a copy? It occurred to me to make the function a template function and simply have the user pass the type, but I hold out hope that C++ offers a more elegant solution.

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  • Are doubles faster than floats in c#?

    - by Trap
    I'm writing an application which reads large arrays of floats and performs some simple operations with them. I'm using floats because I thought it'd be faster than doubles, but after doing some research I've found that there's some confusion about this topic. Can anyone elaborate on this? Thanks.

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  • svn from console - how to save password?

    - by john mcdonald
    Hi all, I was wondering if there is a way to save my svn password when doing svn operations from the console. The console is the only option that I have. When I try to do any svn action "eg svn commmit," it prompts for the account password every time. Is there a way to save this password somehow so that I don't have to retype it every time? Thanks.

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  • Socket Programming : Inputstream Stuck in loop - read() always return 0

    - by Atom Skaa ska Hic
    Server side code public static boolean sendFile() { int start = Integer.parseInt(startAndEnd[0]) - 1; int end = Integer.parseInt(startAndEnd[1]) - 1; int size = (end - start) + 1; try { bos = new BufferedOutputStream(initSocket.getOutputStream()); bos.write(byteArr,start,size); bos.flush(); bos.close(); initSocket.close(); System.out.println("Send file to : " + initSocket); } catch (IOException e) { System.out.println(e.getLocalizedMessage()); disconnected(); return false; } return true; } Client Side public boolean receiveFile() { int current = 0; try { int bytesRead = bis.read(byteArr,0,byteArr.length); System.out.println("Receive file from : " + client); current = bytesRead; do { bytesRead = bis.read(byteArr, current, (byteArr.length-current)); if(bytesRead >= 0) current += bytesRead; } while(bytesRead != -1); bis.close(); bos.write(byteArr, 0 , current); bos.flush(); bos.close(); } catch (IOException e) { System.out.println(e.getLocalizedMessage()); disconnected(); return false; } return true; } Client side is multithreading,server side not use multithreading. I just paste some code that made problem if you want see all code please tell me. After I debug the code, I found that if I set max thread to any and then the first thread always stuck in this loop. That bis.read(....) always return 0. Although, server had close stream and it not get out of the loop. I don't know why ... But another threads are work correctly. do { bytesRead = bis.read(byteArr, current, (byteArr.length-current)); if(bytesRead >= 0) current += bytesRead; } while(bytesRead != -1);

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  • Delay in the implementation of text change in Statusbar control

    - by ehsan zeynali
    I have a function a time consuming operation that is done I want to start and end operations appear to be user (By statusbar control) But when performed function, both text executed at the end of function. (user can not sees "Start Operation ...") What solution do you recommend to me? private void btnUpdateDataBase_Click(object sender, RoutedEventArgs e) { TextBlockStatus.Text = "Start Operation ..."; //Time consuming operation TextBlockStatus.Text = "End Operation ..."; }

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  • Using intermediate array for hashCode and equals

    - by Basilevs
    As its a pain to handle structural changes of the class in two places I often do: class A { private B bChild; private C cChild; private Object[] structure() { return new Object[]{bChild, cChild}; } int hashCode() { Arrays.hashCode(structure); } boolean equals(Object that) { return Arrays.equals(this.structure(), ((A)that).structure()); } } What's bad about this approach besides boxing of primitives? Can it be improved?

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  • Java: one-liner to list Dirs in a directory?

    - by Heoa
    One-Liner to list TXT-files. import java.io.File; import java.io.FilenameFilter; ... files = dir.listFiles(new FilenameFilter() { public boolean accept(File dir, String name) { return name.toLowerCase().endsWith(".txt"); } } ); Source. Is there an one-liner to list dirs in a dir?

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  • How to treat 64-bit words on a CUDA device?

    - by pikkio
    Hi, I'd like to handle directly 64-bit words on the CUDA platform (eg. uint64_t vars). I understand, however, that addressing space, registers and the SP architecture are all 32-bit based. I actually found this to work correctly (on my CUDA cc1.1 card): __global__ void test64Kernel( uint64_t *word ) { (*word) <<= 56; } but I don't know, for example, how this affects registers usage and the operations per clock cycle count.

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  • Query parameter using JS framework ?

    - by Maxim Veksler
    Hi, I seem to not be able to find implementation from the common Ajax libraries (JQuery, mootools, prototypejs...) that would allow the operation of parsing the window.location.href for request parameter. I would expect something like: $P{"param1"} == "param1_value" Am I missing something? p.s. The web does contains implementation examples for such operations

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