LeanStore

LeanStore is a high-performance OLTP storage engine optimized for many-core CPUs and NVMe SSDs. Our goal is to achieve performance comparable to in-memory systems when the data set fits into RAM, while being able to fully exploit the bandwidth of fast NVMe SSDs for large data sets. While LeanStore is currently a research prototype, we hope to make it usable in production in the future.

Compiling

Install dependencies:

sudo apt-get install cmake libaio-dev libtbb-dev

mkdir build && cd build && cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo .. && make -j

TPC-C Example

build/frontend/tpcc --ssd_path=./ssd_block_device_or_file --worker_threads=120 --pp_threads=4 --dram_gib=240 --tpcc_warehouse_count=100 --notpcc_warehouse_affinity --csv_path=./log --cool_pct=40 --free_pct=1 --contention_split --xmerge --print_tx_console --run_for_seconds=60 --isolation_level=si

check build/frontend/tpcc --help for other options

Implemented Featuers

• Lightweight buffer manager with pointer swizzling [ICDE18]
• Optimstic Lock Coupling with Hybrid Page Guard to synchronize paged data structures [IEEE19]
• Variable-length key/values B-Tree with prefix compression and hints [BTW23]
• Scalable and robust out-of-memory Snapshot Isolation (OSIC protocol, Graveyard and FatTuple) [VLDB23]
• Distributed Logging with remote flush avoidance [SIGMOD20, BTW23]
• Recovery [SIGMOD20]

Cite

The code we used for our VLDB 2023 that covers alternative SI commit protocols is in a different branch.

@inproceedings{alhomssi23,
    author    = {Adnan Alhomssi and Viktor Leis},
    title     = {Scalable and Robust Snapshot Isolation for High-Performance Storage Engines},
    booktitle = {VLDB},
    year      = {2023}
}

BTW 2023 branch that covers alternative dependency tracking.

@inproceedings{leanstore23,
    author    = {Adnan Alhomssi, Michael Haubenschild and Viktor Leis},
    title     = {The Evolution of LeanStore},
    booktitle = {BTW},
    year      = {2023}
}

CIDR 2021 branch (outdated).

@inproceedings{alhomssi21,
    author    = {Adnan Alhomssi and Viktor Leis},
    title     = {Contention and Space Management in B-Trees},
    booktitle = {CIDR},
    year      = {2021}
}