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Flashield: a Hybrid Key-value Cache that Controls Flash Write Amplification

Talkat NSDI 2019 · 2019-02-26..02-28· [databases]

speakers

name:Assaf Eisenman

links:none on file

name:Asaf Cidon

links:none on file

name:Evgenya Pergament

links:none on file

name:Or Haimovich

links:none on file

name:Ryan Stutsman

links:none on file

name:Mohammad Alizadeh

linkedin:mohammad-alizadeh-2b072241

name:Sachin Katti

github:sachinkatti

resources

video:https://youtu.be/WphwICSQPaQ

slides:none on file

summary

Flashield is a hybrid DRAM+SSD key‑value cache that uses DRAM as a filter and a lightweight SVM classifier (features: past reads and updates) to admit only “flashy” objects to SSD, writing them large and sequential to cut device wear. It stores variable‑size items with a compact index that costs 4 bytes per object, uses per‑segment Bloom filters and up to 8 hash probes, and achieves a median write amplification 0.5× on Memcachier traces while keeping hit rate and throughput comparable to DRAM-only caches.

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