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PORuby on Rails - Storing and accessing large data sets
 

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  1. PORuby on Rails - Storing and accessing large data sets
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    <p>I am having a hard time managing the storage and access of a large dataset within a Ruby on Rails application. Here is my application in a nutshell: I am performing Dijkstra's algorithm as it pertains to a road network, and then displaying the nodes that it visits using the google maps API. I am using an open dataset of the <a href="http://www.dis.uniroma1.it/~challenge9/download.shtml" rel="nofollow">US road network</a> to construct the graph by iterating over two txt files given in the link, but I am having trouble storing this data in my app.</p> <p>I am under the impression that a large dataset like this not an ActiveRecord object - I don't need to modify the contents of this data, rather be able to access it and cache it locally in a hash to perform ruby methods on it. I have tried a few things but I am running into trouble.</p> <ol> <li><p>I figured that it would make most sense to parse the txt files and store the graph in yml format. I would then be able to load the graph into a DB as seed data, and grab the graph using Node.all, or something along those lines. Unfortunately, the yml file becomes too large for rails to handle. Running a Rake causes the system to run at 100% for infinity...</p></li> <li><p>Next I figured, well since I don't need to modify the data, I can just create the graph every time the application loads as start of its "initialization." But I don't exactly know where to put this code, I need to run some methods, or at least a block of data. And then store it in some sort of global/session variable that I can access in all controllers/methods. I don't want to be passing this large dataset around, just have access to it from anywhere.</p></li> <li><p>This is the way I am currently doing it, but it is just not acceptable. I am parsing the text files that creates the graph on a controller action, and hoping that it gets computing before the server times out.</p></li> </ol> <p>Ideally, I would store the graph in a database that I could grab the entire contents to use locally. Or at least only require the parsing of the data once as the application loads and then I would be able to access it from different page views, etc.. I feel like this would be the most efficient, but I am running into hurdles at the moment.</p> <p>Any ideas?</p>
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