ELECT: Enabling Erasure Coding Tiering for LSM-tree-based Storage

on YouTube ↗22m

" summary

ELECT implements hybrid redundancy on top of Cassandra, encoding LSM last-level SSTables offline into erasure-coded coding groups while keeping hot keys replicated; experiments with YCSB on Alibaba Cloud plus object storage show 56.1% hot-tier storage savings and 39.1% overall savings, degraded-read recovery takes ~50% longer (network-bound) but cloud latency can cut worst-case reads from ~5x to ~1.2x, and the tunable alpha parameter yields actual savings between 9.2% and 86% while preserving normal-mode throughput.

AI-written summary · about

" chapters (11)

1. 0:00ELECT and storage tiering
2. 2:04Storage tiering use cases
3. 4:33Erasure coding vs replication
4. 7:00ELECT design and contributions
5. 8:46Redundancy transitioning
6. 11:15Offline erasure coding
7. 13:44Hotness-aware thresholds
8. 16:29Experimental setup on Alibaba Cloud
9. 17:33Storage savings and performance
10. 19:40Recovery performance impact
11. 20:45Conclusion and Q&A

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