I finally got the call from Flipkart after the interviewer didn't turn up on the previous three occasions, and HR didn't update me on anything. The phone they were using had really bad voice quality, so most of the time I had to guess what the interviewer was asking.

The questions were not generic on Hadoop. He was probably trying to ask questions about issues he had faced in production and expecting answers that only he knew. As per the interviewer, Hadoop code is all buggy, and due to that, frequent issues happen at Flipkart. This sounds funny to me. Overall, I didn't enjoy the interview either.