I read hadoop books previously from O'Rielly Hadoop Definitive Guide, also followed some articles available from the Internet , but i could not go ahead of hello world program as I felt the difficulty in mapping the problem domain to writing map reduce programs. Also I felt it very difficult to map the mappers and reducers in the hadoop distributable with the problem domain.
Do you have any notion in your books towards mapping the problem in map reduce programs.
One thing I kept in mind in writing the book was to have many realistic examples using MapReduce, so you can see various ways of applying it. MapReduce is a different way at structuring problems so it does take some time to get used to. Just as a event-based framework helps a lot in writing GUIs, the MapReduce framework helps in writing large data processing programs. The hurdle is getting used to a different view on this class of problems.