Had a 45 minute techical phone interview [got extended to 60 minutes roughly]

1. A bit about the position and work done by OCI team.
2. A bit about my background and reason for applying.
3. Problem -1
4. Extension of Problem-1
5. Questions for the interviewer

Problem-1 (Design Problem)

Assumig peta-bytes of documents data stored in a local, make <key, value> of all documents that can be indexed efficiently (something like Google Search) using reverse indexing method (https://www.geeksforgeeks.org/inverted-index/) Interviewer was providing helpful inputs to validate if I was going right.

Extension
Ater that asked me, what could be corner cases (memory complexity and runtime complexity) from a programmer perspective and given that data would be increasing at a huge scale down the line -- basically how to make the approach scalable.