Unprofessional, Unplanned and total waste of time for the candidate. Recruiter calls you as if he is giving you the offer immediately but just bluff the open positions. They don't have any project in Bigdata/Hadoop as said by the HR itself. Please be professional first and raise your bar to international standards in terms of interactions with candidate. No one is fool to just waste his/her time for nothing. Take some responsibility to reply to mails etc.