We are trying very hard to maintain API compatibility and your code should not need anything more then a recompile, which may be required for some code to work properly. However in practice with anything big like this there will be issues, and we are staring to run into some of them, that we are trying to fix. I believe that for the most part the command line interface is more or less the same, but 0.23.X is not finished yet so there may be more changes that go in before we get a stable release of 0.23.
--Bobby Evans On 1/13/12 9:32 AM, "dbadav...@aol.com" <dbadav...@aol.com> wrote: I am learning Hadoop and had a question about writing Map Reduce jobs in newer versions of Hadoop. Is Next Generation Map Reduce a change just for our system administrator or do I (developer) already writing Map Reduce code have to start doing things differently too (and is there a guide that explains the changes I need to make)?
