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  • Using Hadoop, are my reducers guaranteed to get all the records with the same key?

    - by samg
    I'm running a hadoop job (using hive actually) which is supposed to uniq lines in a lot of text file. More specifically it chooses the most recently timestamped record for each key in the reduce step. Does hadoop guarantee that every record with the same key, output by the map step, will go to a single reducer, even if there are many reducers running across a cluster? I'm worried that the mapper output might be split after the shuffle happens, in the middle of a set of records with the same key.

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  • Visual Studio .NET C# executable traces

    - by Chilln
    Hey, i've got a question, is it possible to identify the creator of a .NET assembly, just with traces from VisualStudio within the assembly ? Or can you even get a kind of unique ID of the creator out of it? I don't mean the application information like company or description, they can be edited too easily.

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  • iPhone: Start or Download App if not exists from Safari

    - by Heinrich
    Hi, I know its possible to open an app from mobile safari using custom URL Handlers. Is it possible to open the App Store from Safari on the iPhone and automatically install the app? Or might it even be possible to open the app if it exists on the users device and to download it if it doesn't? Best, heinrich

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  • How should I contribute to an open source project?

    - by Rajan Walia
    I know basic C++ like about classes and other basic stuff what are the things which i need to know so that i can understand the source code of some advance open source projects and be able to make one too. Like if i read the code of vlc or some other projects I can't understand many things moreover i am just a beginner have not worked on even multi file programs so please suggest which are the books and what are the basic projects from where i can start.

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  • Set custom keyboard for android application

    - by dAnjou
    Hi, i know that there is the possibility to set a special keyboard with these attributes. But i need my own keyboard as default. How can i do that? How can my app change the settings? As an example, let's say: i want the example SoftKeyboard as default for my app. Is that even possible? Thanks for your efforts :)

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  • Where do I handle asynchronous exceptions?

    - by Jurily
    Consider the following code: class Foo { // boring parts omitted private TcpClient socket; public void Connect(){ socket.BeginConnect(Host, Port, new AsyncCallback(cbConnect), quux); } private void cbConnect(IAsyncResult result){ // blah } } If socket throws an exception after BeginConnect returns and before cbConnect gets called, where does it pop up? Is it even allowed to throw in the background?

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  • generate sha256 with openssl and C++

    - by Stanislav Palatnik
    Hello, I'm looking to create a hash with sha256 using openssl and C++. I know there's a similar post about this here: http://stackoverflow.com/questions/918676/generate-sha-hash-in-openssl, but I'm looking to specifically create sha256. UPDATE: Seems to be a problem witht he include paths. It can't find any openssl functions even though I included #include "openssl/sha.h" and I included the paths in my build -I/opt/ssl/include/ -L/opt/ssl/lib/ -lcrypto

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  • LotusNotes as a datasource for a .net C# site

    - by AlexFreitas
    Is it possible to have a connection to LotusNotes and use it as a data source for a C# project? We use LN for email/calendar :(... and management wants a web page that would interact with the calendar. I think this can all be done within Notes, but I would much rather do it in .net. They also want some very specific functionality, some of which I'm not really sure can even be done in Notes. Cheers, -Alex

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  • Is it okay to use <input type="tel"/> now?

    - by Michael
    I'm working on a mobile phone web app and I have several text fields that could benefit from iPhone's will adjust the keyboard for the user but I'm worried about breaking backwards compatability. What I'm hoping is that browsers/phone that support this can assist the user and other browser will fall back to a standard text field? Is this an acceptable practice? Does it even work?

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  • rspec "it" string

    - by geosteve
    Is it possible for an rspec method to get the value of the parameter passed to it() in the local method? For example, if I want: describe Me do it "should figure this out" puts "I " + SPEC_NAME end end to print this: I should figure this out ... what would I put for SPEC_NAME in the code sample? Even better, how would a relatively new rubologist like me figure this out on his own?

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  • python: a way to get an exhaustive, sorted list of keys in a nested dictionary?

    - by saidimu
    exhaustive: - all keys in the dictionary, even if the keys are in a nested dictionary that is a value to a previous-level dictionary key. sorted: - this is to ensure the keys are always returned in the same order The nesting is arbitrarily deep. A non-recursive algorithm is preferred. level1 = { 'a' : 'aaaa', 'level2_1' : {'b': 'bbbbb', 'level3': {'c': 'cccc', 'd': 'dddddd'} }, 'level2_2' : { 'z': 'zzzzzzz' } }

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  • Compare Database container and class container

    - by Mohit Deshpande
    I am using a SQL Server database in my current project. I was watching the MVC Storefront videos (specifically the repository pattern) and I noticed that Rob (the creator of MVC Storefront) used a class called Category and Product, instead of a database and I have notice that using LINQ-SQL or ADO.NET, that a class is generated. Is there an advantage to using a class over a database to store information? Or is it the other way around? Or are they even comparable?

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  • Expert R users, what's in your .Rprofile?...

    - by gappy
    This question is maybe a little too cute, but I have always found startup profile files of other people both useful and instructive about the language. Moreover, while I have some customization for bash and vim, I have nothing for R. For example, one thing I always wanted is different colors for input and output text in a window terminal, and maybe even syntax highlighting.

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  • How do you unit test a class that's meant to talk to data?

    - by Arda Xi
    I have a few repository classes that are meant to talk to different kinds of data, deriving from an IRepository interface laid out like so: In implementations, the code talks to a data source, be this a directory of XML files or a database or even just a cache. Is it possible to reliably unit test any of these implementations? I don't see a mock implementation working, because then I'm only testing the mock code and not the actual code.

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  • TFS2010 - How can you change the "State" for a Task?

    - by Keith Barrows
    We are using Tasks to track individual development items and the "out of the box" configuration gives us only 2 states - Active and Closed. We would like to change it to: Assigned In Development In Test Ready for Production Closed (In Production) Any ideas on how to accomplish this? We've been through everything in the Admin site. I fine changing it in the DB if necessary but am not sure what should be changed - or if it is even in the DB. TIA

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  • importing modules in app engine

    - by tanky
    Ive asked this before, but it seems i wasnt clear/detailed enough and after a week of trying im still struggling so i will try again. i am trying to use, oauth2 and ply on app engine. i have tried copying their directories into my app engine project directory (in the form ply-3.4 or brosner-python-oauth2-82a05f9) and i have tried copying the specific sub directory contained within the aforemention one. (ply or oauth2) i have tried saying import oauth2, from brosner-oauth2_python-82a05f9 import oauth and other variations on the theme, but i still cant get it to work nothing has worked. i have tried including them in app.yaml, but that seemed to create an even bigger error as my entire project wouldnt even run when i tried that. and now i have run out of things to try. the error log i am getting is as follows. INFO 2012-10-20 22:33:29,358 dev_appserver.py:2884] "GET / HTTP/1.1" 500 - WARNING 2012-10-20 22:33:58,453 py_zipimport.py:139] Can't open zipfile C:\Python27\lib\site-packages\oauth2-1.0.2-py2.7.egg: IOError: [Errno 13] file not accessible: 'C:\Python27\lib\site-packages\oauth2-1.0.2-py2.7.egg' WARNING 2012-10-20 22:33:58,453 py_zipimport.py:139] Can't open zipfile C:\Python27\lib\site-packages\ply-3.4-py2.7.egg: IOError: [Errno 13] file not accessible: 'C:\Python27\lib\site-packages\ply-3.4-py2.7.egg' WARNING 2012-10-20 22:33:58,453 py_zipimport.py:139] Can't open zipfile C:\Python27\lib\site-packages\tweepy-1.11-py2.7.egg: IOError: [Errno 13] file not accessible: 'C:\Python27\lib\site-packages\tweepy-1.11-py2.7.egg' ERROR 2012-10-20 22:34:00,015 wsgi.py:189] Traceback (most recent call last): File "C:\Program Files\Google\google_appengine\google\appengine\runtime\wsgi.py", line 187, in Handle handler = _config_handle.add_wsgi_middleware(self._LoadHandler()) File "C:\Program Files\Google\google_appengine\google\appengine\runtime\wsgi.py", line 225, in _LoadHandler handler = import(path[0]) File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_import_hook.py", line 676, in Decorate return func(self, *args, **kwargs) File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_import_hook.py", line 1850, in load_module return self.FindAndLoadModule(submodule, fullname, search_path) File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_import_hook.py", line 676, in Decorate return func(self, *args, **kwargs) File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_import_hook.py", line 1722, in FindAndLoadModule description) File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_import_hook.py", line 676, in Decorate return func(self, *args, **kwargs) File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_import_hook.py", line 1665, in LoadModuleRestricted description) File "C:\Documents and Settings\ladds\My Documents\udacity\sigh\main.py", line 3, in import ply ImportError: No module named ply INFO 2012-10-20 22:34:00,030 dev_appserver.py:2884] "GET / HTTP/1.1" 500 - thanks for any help.

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  • avoiding the tedium of optional parameters

    - by Kyle
    If I have a constructor with say 2 required parameters and 4 optional parameters, how can I avoid writing 16 constructors or even the 10 or so constructors I'd have to write if I used default parameters (which I don't like because it's poor self-documentation)? Are there any idioms or methods using templates I can use to make it less tedious? (And easier to maintain?)

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  • Uploading multiple files using Spring MVC 3.0.2 after HiddenHttpMethodFilter has been enabled

    - by Tiny
    I'm using Spring version 3.0.2. I need to upload multiple files using the multiple="multiple" attribute of a file browser such as, <input type="file" id="myFile" name="myFile" multiple="multiple"/> (and not using multiple file browsers something like the one stated by this answer, it indeed works I tried). Although no versions of Internet Explorer supports this approach unless an appropriate jQuery plugin/widget is used, I don't care about it right now (since most other browsers support this). This works fine with commons fileupload but in addition to using RequestMethod.POST and RequestMethod.GET methods, I also want to use other request methods supported and suggested by Spring like RequestMethod.PUT and RequestMethod.DELETE in their own appropriate places. For this to be so, I have configured Spring with HiddenHttpMethodFilter which goes fine as this question indicates. but it can upload only one file at a time even though multiple files in the file browser are chosen. In the Spring controller class, a method is mapped as follows. @RequestMapping(method={RequestMethod.POST}, value={"admin_side/Temp"}) public String onSubmit(@RequestParam("myFile") List<MultipartFile> files, @ModelAttribute("tempBean") TempBean tempBean, BindingResult error, Map model, HttpServletRequest request, HttpServletResponse response) throws IOException, FileUploadException { for(MultipartFile file:files) { System.out.println(file.getOriginalFilename()); } } Even with the request parameter @RequestParam("myFile") List<MultipartFile> files which is a List of type MultipartFile (it can always have only one file at a time). I could find a strategy which is likely to work with multiple files on this blog. I have gone through it carefully. The solution below the section SOLUTION 2 – USE THE RAW REQUEST says, If however the client insists on using the same form input name such as ‘files[]‘ or ‘files’ and then populating that name with multiple files then a small hack is necessary as follows. As noted above Spring 2.5 throws an exception if it detects the same form input name of type file more than once. CommonsFileUploadSupport – the class which throws that exception is not final and the method which throws that exception is protected so using the wonders of inheritance and subclassing one can simply fix/modify the logic a little bit as follows. The change I’ve made is literally one word representing one method invocation which enables us to have multiple files incoming under the same form input name. It attempts to override the method protected MultipartParsingResult parseFileItems(List fileItems, String encoding) {} of the abstract class CommonsFileUploadSupport by extending the class CommonsMultipartResolver such as, package multipartResolver; import java.io.UnsupportedEncodingException; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import javax.servlet.ServletContext; import org.apache.commons.fileupload.FileItem; import org.springframework.util.StringUtils; import org.springframework.web.multipart.MultipartException; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.commons.CommonsMultipartFile; import org.springframework.web.multipart.commons.CommonsMultipartResolver; final public class MultiCommonsMultipartResolver extends CommonsMultipartResolver { public MultiCommonsMultipartResolver() { } public MultiCommonsMultipartResolver(ServletContext servletContext) { super(servletContext); } @Override @SuppressWarnings("unchecked") protected MultipartParsingResult parseFileItems(List fileItems, String encoding) { Map<String, MultipartFile> multipartFiles = new HashMap<String, MultipartFile>(); Map multipartParameters = new HashMap(); // Extract multipart files and multipart parameters. for (Iterator it = fileItems.iterator(); it.hasNext();) { FileItem fileItem = (FileItem) it.next(); if (fileItem.isFormField()) { String value = null; if (encoding != null) { try { value = fileItem.getString(encoding); } catch (UnsupportedEncodingException ex) { if (logger.isWarnEnabled()) { logger.warn("Could not decode multipart item '" + fileItem.getFieldName() + "' with encoding '" + encoding + "': using platform default"); } value = fileItem.getString(); } } else { value = fileItem.getString(); } String[] curParam = (String[]) multipartParameters.get(fileItem.getFieldName()); if (curParam == null) { // simple form field multipartParameters.put(fileItem.getFieldName(), new String[] { value }); } else { // array of simple form fields String[] newParam = StringUtils.addStringToArray(curParam, value); multipartParameters.put(fileItem.getFieldName(), newParam); } } else { // multipart file field CommonsMultipartFile file = new CommonsMultipartFile(fileItem); if (multipartFiles.put(fileItem.getName(), file) != null) { throw new MultipartException("Multiple files for field name [" + file.getName() + "] found - not supported by MultipartResolver"); } if (logger.isDebugEnabled()) { logger.debug("Found multipart file [" + file.getName() + "] of size " + file.getSize() + " bytes with original filename [" + file.getOriginalFilename() + "], stored " + file.getStorageDescription()); } } } return new MultipartParsingResult(multipartFiles, multipartParameters); } } What happens is that the last line in the method parseFileItems() (the return statement) i.e. return new MultipartParsingResult(multipartFiles, multipartParameters); causes a compile-time error because the first parameter multipartFiles is a type of Map implemented by HashMap but in reality, it requires a parameter of type MultiValueMap<String, MultipartFile> It is a constructor of a static class inside the abstract class CommonsFileUploadSupport, public abstract class CommonsFileUploadSupport { protected static class MultipartParsingResult { public MultipartParsingResult(MultiValueMap<String, MultipartFile> mpFiles, Map<String, String[]> mpParams) { } } } The reason might be - this solution is about the Spring version 2.5 and I'm using the Spring version 3.0.2 which might be inappropriate for this version. I however tried to replace the Map with MultiValueMap in various ways such as the one shown in the following segment of code, MultiValueMap<String, MultipartFile>mul=new LinkedMultiValueMap<String, MultipartFile>(); for(Entry<String, MultipartFile>entry:multipartFiles.entrySet()) { mul.add(entry.getKey(), entry.getValue()); } return new MultipartParsingResult(mul, multipartParameters); but no success. I'm not sure how to replace Map with MultiValueMap and even doing so could work either. After doing this, the browser shows the Http response, HTTP Status 400 - type Status report message description The request sent by the client was syntactically incorrect (). Apache Tomcat/6.0.26 I have tried to shorten the question as possible as I could and I haven't included unnecessary code. How could be made it possible to upload multiple files after Spring has been configured with HiddenHttpMethodFilter? That blog indicates that It is a long standing, high priority bug. If there is no solution regarding the version 3.0.2 (3 or higher) then I have to disable Spring support forever and continue to use commons-fileupolad as suggested by the third solution on that blog omitting the PUT, DELETE and other request methods forever. Just curiously waiting for a solution and/or suggestion. Very little changes to the code in the parseFileItems() method inside the class MultiCommonsMultipartResolver might make it to upload multiple files but I couldn't succeed in my attempts (again with the Spring version 3.0.2 (3 or higher)).

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  • Baby steps to get into Android application development

    - by Ra'ed Boshmaf
    I am in my semester vacation and i am looking to spend some time in learning how to develop Android application since this market is on fire these days, i have a background with programming and would like you to suggest ways or even sites that use baby steps tutorials to get an idea ( and hopefully ) create android application. Any suggestions would be great since i spend the last 2 days searching the web without finding what i am looking for thanks.

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