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AutoBahn: a concurrency control framework for non-volatile file buffer
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DOI：10.1007/s10586-019-02964-8.png)
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Storage systems in general and databases in particular usually balance between write durability and performance. It is not uncommon that write durability often relies on transaction systems that also offer a relaxed model of durability for performance. As hardware vendors provision more cores and faster storage devices, attaining fast data durability for concurrent file writes is demanding to high-performance storage systems in large-scale cluster systems. We approach the challenge by proposing a system that uses a small amount of fast persistent memory for buffering concurrent file writes while preserving data durability. The main technical issue in designing a durable file buffer is allowing concurrent file writes to store data in a shared and limited space of persistent memory without incurring lock or resource contention. This article addresses such issue and presentsAutoBahn, a durable file buffer that expedites file I/O operations. To prove practicality and effectiveness, we implemented a prototype ofAutoBahnin Linux-4.8.7 and ran several key-value systems-Redis, RocksDB, and WiredTiger-onAutoBahn. Evaluation results on a multicore server demonstrate that all the key-value systems achieved performance levels almost matching the non-durable counterpart.AutoBahnis a useful method that can efficiently deal with concurrent file I/O streams on multicores and fast storage devices.
Keyword:
Storage system
Concurrency control
File buffer
Non-volatile memory
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