Diff of two very large text files

问题

I have to text files:

file one: 400gb
file two: 411gb

These files are database dumps in rdf format. The bigger file is the newer and it has new data. 11gb of the data are new.

I want to do a file diff to get this new 11gb of data to import the new data into my database without touching the old.

How can i do it efficiently using java?

来源：https://stackoverflow.com/questions/24714810/diff-of-two-very-large-text-files