Distributed Diff Map Reduce Tool

Distributed-Diff is a MRv2 utility for comparing large amounts of text data. As Java, and the HashGenerator library that is used supports Unicode it supports a wide range of character encodings. Developed to aid in the testing of systems where potentially millions of records could be generated and needing to be able to do a diff against the expected and generated output.

In the case where the file sizes are too large to fit on a single machine, and/or sorting and diffing them is not feasible on a single machine this utility allows the user to compare two different sets of output and determine if there is a matching line for every record in set A (the reference set) in set B (the test output set). It will also determine if there are any additional records in set B (the test output set) that are not in set A (the reference set).

The program will output two sets of records, those that were missing in the test output set, and those additional records in the test output set that should not have been generated.

If you have any suggestions or problems with it, feel free to get in touch with me.