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What people report studying for — not a take-home dump. Last editorial update 2026-08-22.
KafkaMember event grainMetrics layer
Rounds you should expect
Streaming
Consumer groups, rebalances, and why compaction is wrong on an event topic.
SQL
A feed metric that must not double-count impressions after a join to a member dimension.
Recently added questions
2026-08-22 · Rebalances under load
Your consumer group rebalances every few minutes during peak. What do you check first?
max.poll.interval.ms vs processing time, cooperative sticky assignment, and whether a slow partition (hot key) is triggering leave/join. Adding consumers without fixing poll interval often makes lag worse.