Spotify Builds External Index to Enable Low Latency Point Queries on its Data Lake

Leela Kumili — Wed, 12 Aug 2026 14:26:00 GMT

Spotify introduced external indexing architecture for Apache Parquet data lakes that enables low-latency point queries without replicating datasets into operational databases. The approach maps lookup keys to Parquet files and row locations, allowing targeted reads from cloud object storage while supporting analytics, machine learning, AI applications, and online services from the same datasets.

By Leela Kumili

JioHotstar Explains the Distributed Engineering behind Personalized Ad Requests at Streaming Scale

Leela Kumili — Wed, 05 Aug 2026 14:09:00 GMT

JioHotstar explains the distributed architecture behind its real-time ad request workflow, covering ad decisioning, waterfall tiering, pacing algorithms, latency optimization, and service coordination required to select and deliver personalized advertisements during streaming playback at scale.

By Leela Kumili

InfoQ - Low Latency

Spotify Builds External Index to Enable Low Latency Point Queries on its Data Lake

JioHotstar Explains the Distributed Engineering behind Personalized Ad Requests at Streaming Scale