Integration / Apache Pulsar Interview questions
How does topic compaction work in Pulsar?
Compaction rewrites a topic's backlog into a compacted ledger that keeps only the most recent message for each distinct key, discarding older messages with the same key - similar in spirit to Kafka's log compaction, useful for topics representing "latest state per entity."
It runs as a background job (triggered manually or automatically past a configured threshold) that reads the existing topic data and writes a new compacted ledger, without disrupting normal producer/consumer traffic on the topic in the meantime.
Consumers must explicitly opt in to reading the compacted view; by default, consumers still see the full uncompacted message history unless they request the compacted alternative.
Invest now in Acorns!!! 🚀
Join Acorns and get your $5 bonus!
Acorns is a micro-investing app that automatically invests your "spare change" from daily purchases into diversified, expert-built portfolios of ETFs. It is designed for beginners, allowing you to start investing with as little as $5. The service automates saving and investing. Disclosure: I may receive a referral bonus.
Invest now!!! Get Free equity stock (US, UK only)!
Use Robinhood app to invest in stocks. It is safe and secure. Use the Referral link to claim your free stock when you sign up!.
The Robinhood app makes it easy to trade stocks, crypto and more.
Webull! Receive free stock by signing up using the link: Webull signup.
More Related questions...
