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Sorting a huge file in Java


Sorting a huge file in Java

By : user3851745
Date : October 15 2020, 11:12 PM
hope this fix your issue This is exactly the origin QuickSort back then there was not enough RAM to sort in memory so they procedure is to store partial results in disk.
So what you can do is:
code :


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any quick sorting for a huge csv file

any quick sorting for a huge csv file


By : Nitin Kumar
Date : March 29 2020, 07:55 AM
I wish this helpful for you How does the data get in the CSV format? Does it come from a relational database? You can make it such that whatever process creates the file writes its entries in the right order so you don't have to solve this problem down the line.
If you are doing a simple lexicographic order you can try the unix sort, but I am not sure how that will perform on a file with that size.
Filtering / Sorting huge data in Java

Filtering / Sorting huge data in Java


By : Krzysztof Jaworski
Date : March 29 2020, 07:55 AM
may help you . I would recommend your Option 3 but it doesn't need to be an in-memory database; you could use a proper database instead. Any other option would be just a more specific solution to the general problem of sorting huge amounts of data. That is, after all, exactly what a database is for and it does it very well.
If you really believe your Option 3 is not a good solution then you could implement a sort/merge solution. Gather your Maps as you already do but whenever you reach a limit of records (say 10,000 perhaps) sort them, write them to disk and clear them down from memory.
java - Want to divide long (huge file size in TBs) by some number (huge int) and safely get an int

java - Want to divide long (huge file size in TBs) by some number (huge int) and safely get an int


By : Brhanu Hagos
Date : March 29 2020, 07:55 AM
wish of those help I want to divide long (huge file size in TBs) by some number (huge int) and safely get an int. But with the type conversion properties both int becomes long and the result is long. I'm sure my quotient will be an int, is casting ok or please direct me to a better solution. , Well if casting is okay, then just cast!
code :
long size = ...;
int divisor = ...;
int result = (int) (size / divisor);
long size = ...;
int divisor = ...;
long fullResult = size / divisor;
if (fullResult < Integer.MIN_VALUE || fullResult > Integer.MAX_VALUE) {
    // Whatever, e.g. throw an exception
}
int result = (int) fullResult;
Huge integer file sorting in python

Huge integer file sorting in python


By : QalaQ Ksa
Date : March 29 2020, 07:55 AM
This might help you 1) Divide it to so big files that can be effectively sorted in the memory.
2) Merge those sorted files together into one file.
Sorting a huge text file using hadoop

Sorting a huge text file using hadoop


By : Ángel Moreno
Date : March 29 2020, 07:55 AM
wish helps you Used TreeSet in Map method to hold entire data in the input split and persisted it. Finally I got the sorted file!
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