| Autor: |
Zhan, Yang, Jiao, Yizheng, Porter, Donald E., Conway, Alex, Knorr, Eric, Farach-Colton, Martin, Bender, Michael A., Yuan, Jun, Jannen, William, Johnson, Rob |
| Předmět: |
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| Zdroj: |
ACM Transactions on Storage; Nov2018, Vol. 14 Issue 3, p1-27, 27p |
| Abstrakt: |
Full-path indexing can improve I/O efficiency for workloads that operate on data organized using traditional, hierarchical directories, because data is placed on persistent storage in scan order. Prior results indicate, however, that renames in a local file system with full-path indexing are prohibitively expensive. This article shows how to use full-path indexing in a file system to realize fast directory scans, writes, and renames. The article introduces a range-rename mechanism for efficient key-space changes in a write-optimized dictionary. This mechanism is encapsulated in the key-value Application Programming Interface (API) and simplifies the overall file system design. We implemented this mechanism in Bε-trees File System (BetrFS), an in-kernel, local file system for Linux. This new version, BetrFS 0.4, performs recursive greps 1.5x faster and random writes 1.2x faster than BetrFS 0.3, but renames are competitive with indirection-based file systems for a range of sizes. BetrFS 0.4 outperforms BetrFS 0.3, as well as traditional file systems, such as ext4, Extents File System (XFS), and Z File System (ZFS), across a variety of workloads. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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