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LSM in a Week

CI (main)

Build a simple key-value storage engine in a week!

Tutorial

The tutorial is available at https://skyzh.github.io/mini-lsm. You can use the provided starter code to kick off your project, and follow the tutorial to implement the LSM tree.

Development

cargo x install-tools
cargo x check
cargo x book

If you changed public API in the reference solution, you might also need to synchronize it to the starter crate. To do this, use cargo x sync.

Tutorial Progress

The tutorial has 8 parts (which can be finished in 7 days):

  • Day 1: Block encoding. SSTs are composed of multiple data blocks. We will implement the block encoding.
  • Day 2: SST encoding.
  • Day 3: MemTable and Merge Iterators.
  • Day 4: Block cache and Engine. To reduce disk I/O and maximize performance, we will use moka-rs to build a block cache for the LSM tree. In this day we will get a functional (but not persistent) key-value engine with get, put, scan, delete API.
  • Day 5: Compaction. Now it's time to maintain a leveled structure for SSTs.
  • Day 6: Recovery. We will implement WAL and manifest so that the engine can recover after restart.
  • Day 7: Bloom filter and key compression. They are widely-used optimizations in LSM tree structures.

The tutorial has reference solution up to day 4 and tutorial up to day 4 for now.

My Progress

I have tried to design and complete day5-7 by myself, including:

  • compaction
  • recovery
  • bloom filter

Please check mini-lsm-book/src for implementation details.

In the future, I will try to add Integration tests and a configuration file to support parameter modification.