When you press Enter in Slack, the message does not travel over the WebSocket your client is holding open — it goes out as a separate HTTPS POST to chat.
A payment commits, the API returns 200, the rack loses power, and after recovery the row does not exist. Before blaming the database, six questions have to be separated.
A senior-engineer walkthrough of Log-Structured Merge Trees: MemTable + WAL durability, SSTable layout with sparse index and bloom filters, the L0→Ln level hierarchy, leveled vs tiered vs FIFO compaction, the three…