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• Choosing a distributed shared memory solution

  - by mindas

  I have a task to build a prototype for a massively scalable distributed shared memory (DSM) app. The prototype would only serve as a proof-of-concept, but I want to spend my time most effectively by picking the components which would be used in the real solution later on. The aim of this solution is to take data input from an external source, churn it and make the result available for a number of frontends. Those "frontends" would just take the data from the cache and serve it without extra processing. The amount of frontend hits on this data can literally be millions per second. The data itself is very volatile; it can (and does) change quite rapidly. However the frontends should see "old" data until the newest has been processed and cached. The processing and writing is done by a single (redundant) node while other nodes only read the data. In other words: no read-through behaviour. I was looking into solutions like memcached however this particular one doesn't fulfil all our requirements which are listed below: The solution must at least have Java client API which is reasonably well maintained as the rest of app is written in Java and we are seasoned Java developers; The solution must be totally elastic: it should be possible to add new nodes without restarting other nodes in the cluster; The solution must be able to handle failover. Yes, I realize this means some overhead, but the overall served data size isn't big (1G max) so this shouldn't be a problem. By "failover" I mean seamless execution without hardcoding/changing server IP address(es) like in memcached clients when a node goes down; Ideally it should be possible to specify the degree of data overlapping (e.g. how many copies of the same data should be stored in the DSM cluster); There is no need to permanently store all the data but there might be a need of post-processing of some of the data (e.g. serialization to the DB). Price. Obviously we prefer free/open source but we're happy to pay a reasonable amount if a solution is worth it. In any way, paid 24hr/day support contract is a must. The whole thing has to be hosted in our data centers so SaaS offerings like Amazon SimpleDB are out of scope. We would only consider this if no other options would be available. Ideally the solution would be strictly consistent (as in CAP); however, eventual consistence can be considered as an option. Thanks in advance for any ideas.

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• What is the most common default computer name (sys properties)

  - by John

  What is the most common default computer name for Windows (Home, Pro, Vista, and 7)? (Or a list of the most common.) I tried Google, and read that Redhat linux defaults to "localhost," and Toshiba laptops (Windows) default to Toshiba, and some Dells default to DELL+some model number.

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• How to disable edit mode on cells but checkbox column?

  - by DanSogaard

  My checkbox column doesn't respond when ticked, apparently it was set to read only, so changing state back to false again will make it possible to tick. However, that will turn the whole edit mode to true. I tried to set edit mode to programatically while setting ReadOnly mode to false, but that will disable the checkbox back again. How can I disable edit mode on all cells except checkbox column?

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• Android. How to package a file and then ::fopen it from JNI?

  - by GJ

  How to package a static file and then be able to ::fopen it from JNI? I have read about res/raw/blah and R.raw.blah stuff, but when I install app on emulator and do "adb -e shell", cd /data/data/my_app/, ls, the file is not there.

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• Most efficient way to have a 50 state drop down box in Drupal Forms

  - by user363036

  I know that one way is to have a table in database with all the states and then you would read it in your form. Is there any easier way in your opinion guys ? I feel bad asking for something like this since it is so elementary however I would suppose something as simple like this would already be implemented in Drupal.

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• Cannot download 700 Mo files on a 4 Go Ram PC with rebol

  - by Rebol Tutorial

  read/binary http://mirror.bytemark.co.uk/ubuntu-releases/lucid/ubuntu-10.04-desktop-i386.iso fails because of out of memory. Any sample code to do so ?

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• VS2010 Upgrade Edition - is 'upgrading' from express ligitimate?

  - by Pete

  Hi, I've read from a non reliable source that purchasing VS2010 Upgrade Edition (As opposed to full retail) is a valid licensing route when 'upgrading' from VS Express (free) - Can anyone confirm or refute this? Thank you

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• What's the difference been NoSQL and a Column-Oriented database?

  - by Tedk

  The more I read about NoSQL, the more it begins to sound like a column oriented database to me. What's the difference between NoSQL (e.g. CouchDB, Cassandra, MongoDB) and a column oriented database (e.g. Vertica, MonetDB)?

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• Developer name on the App Store

  - by aon

  I feel worry when i read "company name cannot be edited once submitted." Is it possible that i submit my developer name duplicate to other? (same name) I do not want my developer name duplicate to other. Sorry for my english.

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• Multi-site WCF Service

  - by vault

  I have implemented a WCF service that will be used at Site A with 5 computers in the LAN accessing the service. What I would like to do is have an elevated user/administrator be able to use one of the 5 machines and query an identical service at Site B (also with 5 computers) that they will need to connect to by bypassing the LAN firewall.Accessing data from Site A to Site B (and vica-versa) need only be read-only Is there a standardised way to acheive this using WCF?

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• Is the foobar:finished:context: method of UIView animations delegate really giving a BOOL for finish

  - by mystify

  Althoug I read everywhere that the method signature has a BOOL for finished, I do never get a false. It is always true. And now the strange thing: When I NSLog that out with %d, it is always either 32 or 40. Other BOOLs I have are either 1 or 0. That makes no sense. So: Not a bool, right? What's that instead, really?

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• Adding metadata attributes to MySQL table

  - by Jack

  I would like to add custom attributes to a MySQL table which I can read via php. These attributes are not to interfere with the table itself - they are primarily accessed by php code during code generation time and these attributes HAVE to reside in the DB itself. Something similar in concept to .NET reflection. Does MySQL support anything like this? Thanks.

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• Drupal: how to set theme language programmatically?

  - by takpar

  How can i change drupal default language programmatically somewhere in code (like template.php)? (i need to overwrite default language set by admin in some cases.) i'm using drupal 6. PS: please read my own answer for more detail. and if you may help solve that PS: later i saw a module that was what i wanted. make sure take a look at it: Administration Language Drupal Module

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• binary files writing/reading problems...

  - by ScReYm0

  Ok i have problem with my code for reading binary file... First i will show you my writing code: void book_saving(char *file_name, struct BOOK *current) { FILE *out; BOOK buf; out = fopen(file_name, "wb"); if(out != NULL) { printf_s("Writting to file..."); do { if(current != NULL) { strcpy(buf.catalog_number, current-catalog_number); strcpy(buf.author, current-author); buf.price = current-price; strcpy(buf.publisher, current-publisher); strcpy(buf.title, current-title); buf.price = current-year_published; fwrite(&buf, sizeof(BOOK), 1, out); } current = current-next; }while(current != NULL); printf_s("Done!\n"); fclose(out); } } and here is my "version" for reading: int book_open(struct BOOK *current, char *file_name) { FILE *in; BOOK buf; BOOK *vnext; int count; int i; in = fopen("west", "rb"); printf_s("Reading database from %s...", file_name); if(!in) { printf_s("\nERROR!"); return 1; } i = fread(&buf,sizeof(BOOK), 1, in); while(!feof(in)) { if(current != NULL) { current = malloc(sizeof(BOOK)); current-next = NULL; } strcpy(current-catalog_number, buf.catalog_number); strcpy(current-title, buf.title); strcpy(current-publisher, buf.publisher); current-price = buf.price; current-year_published = buf.year_published; fread(&buf, 1, sizeof(BOOK), in); while(current-next != NULL) current = current-next; fclose(in); } printf_s("Done!"); return 0; } I just need to save my linked list in binary file and to be able to read it back ... please help me. The program just don't read it or its crash every time different situation ...

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• Log4Net & RollingFileAppender to generate Xml files

  - by SaguiItay

  I've managed to configure Log4Net with a RollingFileAppender in order to generate Xml files. However, the generated files are not valid XML files until a "roll" is performed - the XML doesn't have a closing XML tag. Basically, this prevents to files from being read until that are "closed"/"rolled". Anyone else encountered this issue? I my previous (custom) solution I had to write the closing tag after writing each entry, and overwrite it with the next entry... :(

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• working with decimal numbers in php

  - by The Worst Shady

  I want to somehow round the numbers for a rating system in php like this: 4.6667 = 4.6 5.0001 = 5.1 is there any way to do that? (BTW i read the datas from a database)

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• In SQL Server changing column varchar(255) nvarchar

  - by JD

  Hi, I am using SQL server 2008 express and some of our columns are defined as varchar(255). Should I convert these columns to NvarChar(255) or nvarchar(max)? The reason I ask is I read that nvarchar(255) for unicode characters would actually store 1/2 the number of characters (since unicode characters are 2 bytes) whereas 255 with varchar() would allow me to store 255 characters (or is it 255 - 2 for the offset). Would there be any performance hits using nvarchar(max)? JDs

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• Are products like SQL Server and Oracle are "ORDBMS"?

  - by n10i

  According to wikipedia! http://en.wikipedia.org/wiki/ORDBMS IBM's DB2, Oracle database, and Microsoft SQL Server, make claims to support this technology and do so with varying degrees of success So, are these products true "ORDBMS" like PostgreSQL? or they are they are long way from it? can someone plz! point me to any link where i can read about the features still to be implemented by these RDBMS to become true ORDBMS!

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• Reading lists from a file in Ruby

  - by Gjorgji

  Hi, I have a txt file which contains data in the following format: X1 Y1 X2 Y2 etc.. I want to read the data from this file and create two lists in ruby (X containing X1, X2 and Y containing Y1, Y2). How can I do this in Ruby? Thanks.

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• Using Qt CSS to set own Q_PROPERTY(QFont)

  - by Kamil Klimek

  Hi there. I'm using Qt 4.6.2 and i have problem with QCSS. I have own Q_PROPERTY(QFont myFont READ myFont SET setMyFont). I want to change it with QCSS but it doesn't work. I've tried using normal font syntax but it doesn't work. I've also tried few other combinations like: qproperty-myFont: font(serif 20 1 0) font(serif 20 bold) QFont(serif 20 1 0) QFont(serif 20 bold) QFont(bold 20px serif) etc.

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• How can I make a view start in landscape?

  - by Alex Gosselin

  I have read a few questions about an app doing it through the info file but not a certain view. I just need the interface to be set up to start in landscape view. I managed to get near what I want with shouldAutoRotateToInterfaceOrientation:, but it only works after I rotate the view. I am kinda new to the documentation on this so I may be looking in the wrong places for this. Any help is appreciated.

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• Bash Shell Scripting - return key/Enter key

  - by veda

  I need to compare my input with enter key/return key... read -n1 key if [ $key == "\n" ] echo "@@@" fi But this is not working.. What is wrong with this code

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• How to solve Python memory leak when using urrlib2?

  - by b_m

  Hi, I'm trying to write a simple Python script for my mobile phone to periodically load a web page using urrlib2. In fact I don't really care about the server response, I'd only like to pass some values in the URL to the PHP. The problem is that Python for S60 uses the old 2.5.4 Python core, which seems to have a memory leak in the urrlib2 module. As I read there's seems to be such problems in every type of network communications as well. This bug have been reported here a couple of years ago, while some workarounds were posted as well. I've tried everything I could find on that page, and with the help of Google, but my phone still runs out of memory after ~70 page loads. Strangely the Garbege Collector does not seem to make any difference either, except making my script much slower. It is said that, that the newer (3.1) core solves this issue, but unfortunately I can't wait a year (or more) for the S60 port to come. here's how my script looks after adding every little trick I've found: import urrlib2, httplib, gc while(true): url = "http://something.com/foo.php?parameter=" + value f = urllib2.urlopen(url) f.read(1) f.fp._sock.recv=None # hacky avoidance f.close() del f gc.collect() Any suggestions, how to make it work forever without getting the "cannot allocate memory" error? Thanks for advance, cheers, b_m update: I've managed to connect 92 times before it ran out of memory, but It's still not good enough. update2: Tried the socket method as suggested earlier, this is the second best (wrong) solution so far: class UpdateSocketThread(threading.Thread): def run(self): global data while 1: url = "/foo.php?parameter=%d"%data s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(('something.com', 80)) s.send('GET '+url+' HTTP/1.0\r\n\r\n') s.close() sleep(1) I tried the little tricks, from above too. The thread closes after ~50 uploads (the phone has 50MB of memory left, obviously the Python shell has not.) UPDATE: I think I'm getting closer to the solution! I tried sending multiple data without closing and reopening the socket. This may be the key since this method will only leave one open file descriptor. The problem is: import socket s=socket.socket(socket.AF_INET, socket.SOCK_STREAM) socket.connect(("something.com", 80)) socket.send("test") #returns 4 (sent bytes, which is cool) socket.send("test") #4 socket.send("test") #4 socket.send("GET /foo.php?parameter=bar HTTP/1.0\r\n\r\n") #returns the number of sent bytes, ok socket.send("GET /foo.php?parameter=bar HTTP/1.0\r\n\r\n") #returns 0 on the phone, error on Windows7* socket.send("GET /foo.php?parameter=bar HTTP/1.0\r\n\r\n") #returns 0 on the phone, error on Windows7* socket.send("test") #returns 0, strange... *: error message: 10053, software caused connection abort Why can't I send multiple messages??

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• Dequeue notification table in Oracle

  - by user171523

  I have implemented below sample. It is working fine. I am planning to integrate with this .net application. As soon i read the entry i would like to dequeue the entry. Can any one tell how i can achive that. http://www.oracle-base.com/articles/10g/dbms_change_notification_10gR2.php Meanwhile i am trying AQ. But it does not have good .net (C#)support

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• Error -3 while decompressing data: incorrect header check

  - by Rahul99

  I have .zip file which contain csv data. I am reading .zip file using <input type = "file" name = "select_file"/> I want to decompress that .zip file and read csv data. file_data = self.request.get('select_file') file_str = zlib.decompress(file_data) #file_data_list = file_str.split('\n') #file_Reader = csv.reader(file_data_list,quoting=csv.QUOTE_NONE ) I am expecting csv data in file_str but I am getting error. error :: Error -3 while decompressing data: incorrect header check What I have to use?

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