Скачать или смотреть 3 Cassandra interview QA (2025 Edition) | 2025-09-12 02:14 PM

📘 Neulax - Cassandra Interview Prep
This video contains 3 Cassandra interview questions with answers.

📝 Questions & Answers:

Q1: What is paging and how are large partitions handled?
A1: Cassandra supports paging for large result sets but very large partitions (wide rows) can still hurt performance; design partitions with bounded size. Example: Like reading a long ledger page-by-page rather than pulling an unwieldy single mega-page—still, prefer smaller page sizes for comfort.

Q2: What are tombstone problems and how to mitigate them?
A2: Excessive tombstones (from lots of deletes/TTL) can cause large read latencies; mitigate with careful data modeling, appropriate gc_grace_seconds, compaction tuning, and avoiding wide partitions with many deletes. Example: Like too many sticky 'delete' notes clogging the filing process—clean them systematically and avoid creating so many in the first place.

Q3: What are consistency levels?
A3: Consistency levels (e.g., ONE, QUORUM, ALL, LOCAL_QUORUM) control how many replicas must acknowledge reads/writes for an operation to succeed. Example: Like choosing whether one branch’s sign-off, a majority of branches, or every branch must confirm an update before considering it complete.

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