ChainMapper/ChainReducer have been ported to use new api through http://issues.apache.org/jira/browse/MAPREDUCE-372. But it is not available in 0.20. You can try to apply the patch yourself from the jira.
Thanks Amareshwari On 2/12/10 8:39 PM, "Dean Jones" <[email protected]> wrote: Hello folks, I'm looking at using ChainMapper and ChainReducer. Is there any way of using these classes without using the deprecated parts of the Hadoop API (e.g. JobConf, mapred.Mapper, etc)? We've recently moved our application away from those deprecated classes, but we now have a requirement which would benefit from being able to use ChainMapper and ChainReducer; we don't want to go back to using the deprecated API, so is there any other way we can use them? Or maybe there are new versions of ChainMapper and ChainReducer which I've overlooked? Thanks for any help. Best wishes, Dean.
