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• Google I/O 2010 - Google Storage for Developers

  Google I/O 2010 - Google Storage for Developers Google I/O 2010 - Google Storage for Developers App Engine, Enterprise 101 David Erb, Michael Schwartz Google is expanding our storage products by introducing Google Storage for Developers. It offers a RESTful API for storing and accessing data at Google. Developers can take advantage of the performance and reliability of Google's storage infrastructure, as well as the advanced security and sharing capabilities. We will demonstrate key functionality of the product as well as customer use cases. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 13 0 ratings Time: 52:14 More in Science & Technology

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• Architecture for Social Graph data that has a Time Frame Associated?

  - by Jay Stevens

  I am adding some "social" type features to an existing application. There are a limited # of node & edge types. Overall the data itself is relatively small (50,000 - 70,000 for each type of node) there will be a number of edges (relationships) between them (almost all directional). This, I know, is relatively easy to represent with an SDF store (such as BrightstarDB) or something like Microsoft's Trinity (or really many of the noSQL options). The thing that, I think, makes this a unique use case is that each relationship will have a timeframe associated with it (start and end dates). Right now, I'm thinking of just storing this in a relational structure and dealing with the headaches of "traversing the graph", but I'm looking for suggestions on a better approach (both in terms of data structure and server): Column ================ From_Node_ID Relationship To_Node_ID StartDate EndDate Any suggestions or thoughts are welcomed.

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• Installing pygame with pip

  - by David Y. Stephenson

  I'm trying to install pygame using pip in a virtualenv. I'm following this tutorial on using Kivy. However, running pip install pygame returns Downloading/unpacking pygame Downloading pygame-1.9.1release.tar.gz (2.1MB): 2.1MB downloaded Running setup.py egg_info for package pygame WARNING, No "Setup" File Exists, Running "config.py" Using UNIX configuration... /bin/sh: 1: sdl-config: not found /bin/sh: 1: smpeg-config: not found Hunting dependencies... WARNING: "sdl-config" failed! WARNING: "smpeg-config" failed! Unable to run "sdl-config". Please make sure a development version of SDL is installed. No files/directories in /tmp/pip-build-root/pygame/pip-egg-info (from PKG-INFO) Storing complete log in /home/david/.pip/pip.log The content of /home/david/.pip/pip.log can be found at http://paste.ubuntu.com/5800296/ What am I doing wrong? I'm trying to keep to the standard methodology for installing pygame as much as possible in order to avoid deviating from the tutorial. Suggestions?

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• jMonkey Quest Database

  - by theJollySin

  I am building a game in jMonkey (Java) and I have so far only used default quest text. But now I need to start populating a lot of quests with text. My design requires A LOT of quests texts. What is the best way to build a database of quest texts in jMonkey? I don't have a lot of real experience with databases. Is there a database that integrates well with jMonkey? Here are the ideal properties I want in my database, in order of priority: Reasonably light learning curve Easy portability (in Java) to Windows, Linux, and Mac OSX Good interface with Java Good interface with jMonkey The ability to add properties to the quests: ID, level, gender, quest chain ID, etc. Or am I wrong in thinking I need to use some giant monster like SQL? I haven't been able to find much information on this, so are people using some non-database methods for storing things like quest text in jMonkey?

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• Why don't computers store decimal numbers as a second whole number?

  - by SomeKittens

  Computers have trouble storing fractional numbers where the denominator is something other than a solution to 2^x. This is because the first digit after the decimal is worth 1/2, the second 1/4 (or 1/(2^1) and 1/(2^2)) etc. Why deal with all sorts of rounding errors when the computer could have just stored the decimal part of the number as another whole number (which is therefore accurate?) The only thing I can think of is dealing with repeating decimals (in base 10), but there could have been an edge solution to that (like we currently have with infinity).

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• How to implement Cache in web apps?

  - by Jhonnytunes

  This is really two questions. Im doing a project for the university for storing baseball players statitics, but from baseball data I have to calculate the score by year for the player who is beign displayed. The background is, lets say 10, 000 users hit the player "Alex Rodriguez", the application have to calculate 10, 000 the A-Rod stats by years intead of just read it from some where is temporal saved. Here I go: What is the best method for caching this type of data? Do I have to used the same database, and some temporal values on the same database, or create a Web Service for that? What reading about web caching so you recommend?

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• How should calculations be handled in a document database

  - by Morten

  Ok, so I have a program that basically logs errors into a nosql database. Right now there is just a single model for an error and its stored as a document in the nosql database. Basically I want to summarize across different errors and produce a summary of the "types" of errors that occured. Traditionally in a SQL database the this normalization would work with groupings, sums and averages but in a NoSQL database I assume I need to use mapreduce. My current model seems unfit for the task, how should I change the way I store "models" in order to make statistical analysis easy? Would a NoSQL database even be the right tool for this type of problem? I'm storing things in Google AppEngine's BigTable, so there are some limitations to think of as well.

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• Azure Blob storage defrag

  - by kaleidoscope

  The Blob Storage is really handy for storing temporary data structures during a scaled-out distributed processing. Yet, the lifespan of those data structures should not exceed the one of the underlying operation, otherwise clutter and dead data could potentially start filling up your Blob Storage Temporary data in cloud computing is very similar to memory collection in object oriented languages, when it's not done automatically by the framework, temp data tends to leak. In particular, in cloud computing,  it's pretty easy to end up with storage leaks due to: Collection omission. App crash. Service interruption. All those events cause garbage to accumulate into your Blob Storage. Then, it must be noted that for most cloud apps, I/O costs are usually predominant compared to pure storage costs. Enumerating through your whole Blob Storage to clean the garbage is likely to be an expensive solution. Lokesh, M

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• How do multi-platform games usually store save data?

  - by PixelPerfect3

  I realize this is a bit of a broad question, but I was wondering if there is a "standard" in the industry when it comes to storing save data for games (and is it different across platforms - Xbox/PS/PC/Mac/Android/iOS?) For example for a game like Assassin's Creed or The Walking Dead: They are on multiple platforms and they usually have to save enough information about the player and their actions. Do they use something like XML files, databases, or just straight binary dumps? How much does it differ from platform to platform? I would appreciate it if someone with experience in the game industry would answer this.

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• Texturing a mesh generated from voxel data

  - by Minja

  I have implemented the Marching Cubes algorithm to display an isosurface based on voxel data. Currently, it is displayed with triplanar texturing. I'm working with unity, so I have a material with the triplanar shader attached. Now, the whole isosurface is rendered using this material. And thats my problem: I want the texture to represent the voxel data. I'm storing a material value for every point in the grid, and based on this value, I want the texture of the isosurface to change. Sadly, I have no clue how to do this. So if the voxel is sand, I want sand to be displayed; if it's stone, then there should be stone. Right now, everything is displayed as sand. Thanks in advance!

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• Localization in php, best practice or approach?

  - by sree

  I am Localizing my php application. I have a dilemma on choosing best method to accomplish the same. Method 1: Currently am storing words to be localized in an array in a php file <?php $values = array ( 'welcome' => 'bienvenida' ); ?> I am using a function to extract and return each word according to requirement Method 2: Should I use a txt file that stores string of the same? <?php $welcome = 'bienvenida'; ?> My question is which is a better method, in terms of speed and effort to develop the same and why? Edit: I would like to know which method out of two is faster in responding and why would that be? also, any improvement on the above code would be appreciated!!

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• How can I allow robots access to my sitemap, but prevent casual users from accessing it?

  - by morpheous

  I am storing my sitemaps in my web folder. I want web crawlers (Googlebot etc) to be able to access the file, but I dont necessarily want all and sundry to have access to it. For example, this site (superuser.com), has a site index - as specified by its robots.txt file (http://superuser.com/robots.txt). However, when you type http://superuser.com/sitemap.xml, you are directed to a 404 page. How can I implement the same thing on my website? I am running a LAMP website, also I am using a sitemap index file (so I have multiple site maps for the site). I would like to use the same mechanism to make them unavailable via a browser, as described above.

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• Best practices with Vertices in Open GL

  - by Darestium

  What is the best practice in regards to storing vertex data in Open GL? I.e: struct VertexColored { public: GLfloat position[]; GLfloat normal[]; byte colours[]; } class Terrian { private: GLuint vbo_vertices; GLuint vbo_normals; GLuint vbo_colors; GLuint ibo_elements; VertexColored vertices[]; } or having them stored seperatly in the required class like: class Terrian { private: GLfloat vertices[]; GLfloat normals[]; GLfloat colors[]; GLuint vbo_vertices; GLuint vbo_normals; GLuint vbo_colors; GLuint ibo_elements; }

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• Best practice for managing dynamic HTML modules?

  - by jt0dd

  I've been building web apps that add and remove lots of dynamic content and even structure within the page, and I'm not impressed by the method I'm using to do it. When I want to add a section or module into a position in the interface, I'm storing the html in the code, and I don't like that: if (rank == "moderator") { $("#header").append('<div class="mod_controls">' + // content, using + to implement line breaks '</div>'); } This seems like such a bad programming practice.. There must be a better way. I thought of building a function to convert a JSON structure to html, but it seems like overkill. For the functionality of the apps I'm using: Node.js JS JQuery AJAX Is there some common way to store HTML modules externally for AJAX importation?

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• How can I get pictures from Shotwell on the notebook to the desktop?

  - by Meng Tian

  My father has a desktop and a notebook. The desktop is way more powerful and has RAID set up, so he uses it for editing and storing his pictures. But he spends several months a year away from home. So he has a notebook for this. He imports the pictures into shotwell on his computer. He likes to organise his pictures on the notebook already, by creating and naming the right events, deleting pictures and sometimes editing a bit. When he is back home, he wants to get his pictures on the desktop, without losing the names of the events in shotwell. Sadly, one cannot merge two shotwell databases, nor is it possible to import another database. Do you know any way, I can manage this? Or did I just miss something?

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• Quickly compute added and removed lines

  - by Philippe Marschall

  I'm trying to compare two text files. I want to compute how many lines were added and removed. Basically what git diff --stat is doing. Bonus points for not having to store the entire file contents in memory. The approach I'm currently having in mind is: read each line of the old file compute a hash (probably MD5 or SHA-1) for each line store the hashes in a set do the same for each line in the new file every hash from the old file set that's missing in the new file set was removed every hash from the new file set that's missing in the old file set was added I'll probably want to exclude empty and all white space lines. There is a small issue with duplicated lines. This can either be solved by additionally storing how often a hash appears or comparing the number of lines in the old and new file and adjust either the added or removed lines so that the numbers add up. Do you see room for improvements or a better approach?

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• How to implement a safe password history

  - by Lorenzo

  Passwords shouldn't be stored in plain text for obvious security reasons: you have to store hashes, and you should also generate the hash carefully to avoid rainbow table attacks. However, usually you have the requirement to store the last n passwords and to enforce minimal complexity and minimal change between the different passwords (to prevent the user from using a sequence like Password_1, Password_2, ..., Password_n). This would be trivial with plain text passwords, but how can you do that by storing only hashes? In other words: how it is possible to implement a safe password history mechanism?

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• What would be the best approach to make revisions of user content?

  - by Kevin Simper

  I have searched and could not find any information about it. What is the best approach to storing revisions? I have a website where the user can write a document which can be fairly long (200-300 lines). How do you determine when to make a revision? Is it not a scalable solution to make a new one whenever the save, because that would be useless to the user when the want to look back, and it would require quite a lot of space. You could use time and say for every 15 minute they are working on it there would be a revision, but that would sometimes be nothing or the whole document have completely changed. I could make a diff from the previous revision, and compare by line and look at how many percent of the lines have been changed. What are other doing revisions?

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• Shifting from no-www to www and browsers' password storage

  - by user1444680

  I created a website having user-registration system and invited my friend to join it. I gave him the link of no-www version: http://mydomain.com but now after reading this and this, I want to shift to www.mydomain.com. But there's a problem. I saw that my browser is storing separate passwords for mydomain.com and www.mydomain.com. So in my friend's browser his password must have been stored for no-www. That means after I shift to www and next time he opens the login page, his browser wouldn't auto-fill the username and password fields and there will also be an extra entry (of no-www) in his browser's database of stored passwords. Can this be avoided? Can I do something that will convey to browsers that www.mydomain.com and mydomain.com are the same website? I already have a CNAME record for www pointing to mydomain.com but it seems that search engines consider CNAME as alias but browsers consider them as different websites, I don't know why.

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• Automated Post-billing Service/Solution

  - by geoffreak

  I'm trying to find a solution or service that will allow for my company to automatically take a customer's credit card information via the web to keep on file and bill against based on how much they have used the services we provide. We need a service that will also handle the payment processing as well. Note that this is not recurring billing. The bill at the end of each month won't be the same. Presently, we are having to take a customer's credit card information over the phone and manually input it into Quickbooks, but this just doesn't work for scalability. We will still be manually invoicing the customers, but we need automated credit card acceptance and storage without the liabilities involved with storing it on our own server. Solutions that integrate with Wordpress would be a plus.

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• Fast set indexing data structure for superset retrieval

  - by Asterios

  I am given a set of sets: {{a,b}, {a,b,c}, {a,c}, {a,c,f}} I would like to have a data structure to index those sets such that the following "lookup" is executed fast: find all supersets of a given set. For example, given the set {a,c} the structure would return {{a,b,c}, {a,c,f}, {a,c}} but not {a,b}. Any suggestions? Could this be done with a smart trie-like data structure storing sets after a proper sorting? This data structures is going to be queried a lot. Thus, I'm searching for a structure that might be expensive in build but rather fast to query.

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• Speed up lighting in deferred shading

  - by kochol

  I implemented a simple deferred shading renderer. I use 3 G-Buffer for storing position (R32F), normal (G16R16F) and albedo (ARGB8). I use sphere map algorithm to store normals in world space. Currently I use inverse of view * projection matrix to calculate the position of each pixel from stored depth value. First I want to avoid per pixel matrix multiplication for calculating the position. Is there another way to store and calculate position in G-Buffer without the need of matrix multiplication Store the normal in view space Every lighting in my engine is in world space and I want do the lighting in view space to speed up my lighting pass. I want an optimized lighting pass for my deferred engine.

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• File system implementation in MongoDB with GridFS

  - by Ralph

  I am working on two projects that will both implement a Webdav server backed by a MongoDB GridFS. In each case, there is the potential for the system to store tens of millions of files spread across thousands of hierarchical directories. I can come up with two different ways of storing the directory structure: As a "true" hierarchical file system, with directories containing the IDs (_id) of subdirectories and regular files. The paths will be separated by slashes (/) as in a POSIX-compliant file system. The path /a/b/c will be represented as a directory a containing a directory b containing a file c. As a flat file system, where file names include the slashes. The path /a/b/c will be stored as a single file with the name /a/b/c What are the advantages and disadvantages of each, with respect to a "real" folder-based file system?

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• Unable to install Ubuntu 12.10 on windows 8 machine/ error no5

  - by JOBIN VARGHESE

  installing crashes at halfway of 'copying files' showing an i\o device error error no5; there was problem in beginning of installation too, ubuntu was not detecting the installed windows 8. my system is a dell inspiron 5520 laptop ,with 1 tb WDC hard disk in GPT ,with EFI . my current partition is like 102 mb EFI SYSTEM partition 200 gb Windows 8 ntfs 22 gb root Ext4 8 gb swap 20 db home Ext4 680 gb ntfs Drive for storing all my files. i tried both dvd disc and usb drive, both resulted in same error. inbuild dell hardware diagnosis utility showed both hard disk and dvd drive as healthy what may be the reason and how can i install ubuntu along side my windows 8?

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• 'module' object has no attribute 'PY2'

  - by ManikandanV

  I am using ubuntu 14.04, was trying to install python-memcache. I have got an error like Downloading/unpacking python-memcached Downloading python-memcached-1.53.tar.gz Cleaning up... Exception: Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main status = self.run(options, args) File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 278, in run requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle) File "/usr/lib/python2.7/dist-packages/pip/req.py", line 1229, in prepare_files req_to_install.run_egg_info() File "/usr/lib/python2.7/dist-packages/pip/req.py", line 292, in run_egg_info logger.notify('Running setup.py (path:%s) egg_info for package %s' % (self.setup_py, self.name)) File "/usr/lib/python2.7/dist-packages/pip/req.py", line 284, in setup_py if six.PY2 and isinstance(setup_py, six.text_type): AttributeError: 'module' object has no attribute 'PY2' Storing debug log for failure in /home/mani/.pip/pip.log I am getting the same error when installing Django-celery, pymongo etc

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