Amazon Bie interview questions

I had 4 rounds of discussion out of which,in one round the interviewer joined 15 mins late and also in the middle of the interview went away for 10 mins.Even after that the interview went on only for 25 mins or so while it was supposed to be an 1 hr discussion.The interviewer seemed completely uninterested in taking the interview which seemed very unprofessional. Also the other interviewers praised the discussions but at the end I wasn't selected for the next round with no feedback or explanation whatsoever. Didn't expect this from such a reputed organization. Also the recruiter never comes back on time,never picks up the phone or replies to the mail.

some are friendly, some interviewer feel like interrogation, keep interrupting you very annoying. total 5 rounds, asking pretty much similar behavior questions like backbone stuff...setting up ETL, modeling, simple sql, simple code. a lot of behavior questions. its grueling..