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Sundial for VLDB

Distributed transactions suffer from poor performance due to two major limiting factors. First, distributed transactions suffer from high latency because each of their accesses to remote data incurs a long network delay. Second, this high latency increases the likelihood of contention among distributed transactions, leading to high abort rates and low performance. The authors present Sundial, an in-memory distributed optimistic concurrency control protocol that addresses these two limitations.

Archival Storage at Two Sigma

The author presents CelFS, Two Sigma’s geo-distributed file system. Although CelFS has scaled to serve tens of petabytes of data, it uses physical partitioning to provide quality of service guarantees, it has a high replication overhead, and cannot take advantage of outsourced cold storage The talk further describes our response to these limitations in Jaks, a new storage system to reduce the TCO of CelFS and serve as the backend for other systems at Two Sigma.