Have you seen this: <http://wiki.apache.org/hadoop/HowToDebugMapReducePrograms>
Alex On Tue, Nov 11, 2008 at 6:03 PM, ZhiHong Fu <[EMAIL PROTECTED]> wrote: > Hello, > > I'm very sorry to trouble you, I'm developing a MapReduce > Application, And I can get Log.INFO in InputFormat ,but In Mapper or > Reducer > , I can't get anything > > . And Now an error occured in the reduce stage. Because the code is a > little > complicated, I can't find where is the mistake just form the thrown > exception. I want to use > > log4j to log the intermediate info. But I have tried a whole day , Now I > can't still get anything. who can help me? Thanks very much. > > ddream. >
