Hadoop Map Reduce and Big Data Analytics solutions will be in great demand in coming years.
In the current scenario, business applications typically work with data in the size of petabytes, which requires Big Data technology like Hadoop.
Now a days, Hadoop can also interface to Oracle database, which goes to show that both Oracle and Cloudera are so eager to put Hadoop in mainstream technology of choice.Then there is Karmasphere which provides IDE and BI solution on top of Hadoop Map Reduce. Also, Pentaho provides solution on top of Big Data. There are many open source Java products which are supporting Big Data Hadoop in a big way.
All the above should make Java develoeprs think that Hadoop is definitely a skill which will be in demand for many software companies in future.
Happy reading :)