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  1. #1
    aneuryzma is offline Member
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    Aug 2008
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    Default Issues with parsing huge file

    I'm parsing a document and writing to disk pairs such as these ones:
    0 vs 1, true
    0 vs 2, false
    0 vs 3, true
    1 vs 2, true
    1 vs 3, false
    and so on.

    Successively i'm balancing the trues and falses rows for each instance, by removing random lines (lines with true value if they exceed, and viceversa) and I end up with a file such as this one:
    0 vs 1 true
    0 vs 2 false
    1 vs 2 true
    1 vs 3 true
    1 vs 4 false
    1 vs 5 false

    The falses are usually much much more than trues, so in the previous example, I could keep only 1 false for isntance 0, and only 2 falses for instance 1.

    I'm doing this process in 2 steps, before parsing and then balancing.

    Now, my issue is that the unbalanced file is too big: more than 1GB, and most of its rows are going to be removed by the balancing step.

    My question is: can I balance the rows while parsing ?

    My guess is no, because I don't know which items are arriving and I can't delete any row until when all rows for a specific instance have been discovered.

    I hope it is clear.

  2. #2
    Tolls is offline Moderator
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    Apr 2009
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    I have absolutely no idea what any of that means.
    There is so little useful requirements in there that I can't make head nor tail of it all.

  3. #3
    Skiller is offline Member
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    Jan 2011
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    Quote Originally Posted by aneuryzma View Post
    My question is: can I balance the rows while parsing ?
    I have no idea what you mean by "balance" but if a row can be "balanced" without needing to know about another row in the file then you could "balance" the row while parsing.

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