Memtables: The Fast Write Buffer Inside LioranDB

Short summary

LioranDB uses in-memory memtables as an ordered write buffer before flushing data to its on-disk B+ tree. When a mutable memtable exceeds its size limit, it becomes immutable and is flushed in the background while backpressure controls prevent unbounded memory growth. This architecture acts as a pressure valve between fast CPU-speed writes and slower disk-speed persistence.

• •Memtables absorb writes in-memory before flushing to B+ tree on disk
• •Immutable memtables are flushed in background with backpressure controls
• •Ordered map enables sorted flushes friendly to B+ tree bulk writes

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