2026-09-20T12:23:52Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/106349 2023-07-11 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Huang, Jian Wang, Xiaohao 2020-03-02T22:12:19Z 2020-03-02T22:12:19Z 2022-03-03T10:15:08Z 2019-11-19 2019-12 Log-structured merge (LSM) tree-based key-value stores, such as LevelDB and RocksDB, have seen great adoption in industry due to their high write speed. However, one major issue with LSM-based databases is the high write amplification. The root cause of this problem is the LSM tree structure that demands each level to be completely sorted. In this work, we propose OpenKV, a novel key-value store for open-channel SSD that achieves very low write amplification with good read performance. We propose a design with partially sorted levels with lazy compaction to reduce write amplification, and we have designed a central lookup table based on the cuckoo filter to utilize the open-channel SSD's direct page-level access. In our evaluation we show that compared to LevelDB, our design can reduce write traffic by 2.6x to 3.5x while improving random read performance by up to 1.8x. Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2021-12-01 The student, Xiaohao Wang, accepted the attached license on 2019-11-19 at 14:35. The student, Xiaohao Wang, submitted this Thesis for approval on 2019-11-19 at 14:51. This Thesis was approved for publication on 2019-11-19 at 16:03. DSpace SAF Submission Ingestion Package generated from Vireo submission #14566 on 2020-02-28 at 17:22:25 Made available in DSpace on 2020-03-02T22:12:19Z (GMT). No. of bitstreams: 3 WANG-THESIS-2019.pdf: 988208 bytes, checksum: e0f934a9b5fd42ca5c4b5e498e44f68c (MD5) Master Thesis.zip: 1031677 bytes, checksum: 069c09f13858e68ba0a6f7c3a69f3123 (MD5) LICENSE.txt: 4209 bytes, checksum: 9ff8f45ee449fb9b76319fa72af5c558 (MD5) Previous issue date: 2019-11-19 Embargo set by: Seth Robbins for item 113890 Lift date: 2022-03-02T22:12:26Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system Embargo set by: Seth Robbins for item 113890 Lift date: 2022-03-02T22:15:21Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system Embargo set by: Seth Robbins for item 113890 Lift date: 2022-03-02T22:18:25Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system U of I Only Restriction Lifted for Item 113890 on 2022-03-03T10:15:08Z. application/pdf http://hdl.handle.net/2142/106349 en Copyright 2019 Xiaohao Wang Key-Value Store, Cuckoo Filter, Open-Channel SSD OpenKV: LSM-tree-based key-value store for open-channel SSD text text Electrical & Computer Eng Electrical & Computer Engr University of Illinois at Urbana-Champaign Thesis M.S.