Obladi: Oblivious Serializable Transactions in the Cloud


Natacha Crooks, The University of Texas at Austin; Matthew Burke, Ethan Cecchetti, Sitar Harel, Rachit Agarwal, and Lorenzo Alvisi, Cornell University


This paper presents the design and implementation of Obladi, the first system to provide ACID transactions while also hiding access patterns. Obladi uses as its building block oblivious RAM, but turns the demands of supporting transactions into a performance opportunity. By executing transactions within epochs and delaying commit decisions until an epoch ends, Obladi reduces the amortized bandwidth costs of oblivious storage and increases overall system throughput. These performance gains, combined with new oblivious mechanisms for concurrency control and recovery, allow Obladi to execute OLTP workloads with reasonable throughput : it comes within 5×to 12× of a non-oblivious baseline on the TPC-C, SmallBank, and FreeHealth applications. Latency overheads, however, are higher (70× on TPC-C).

Open Access Media

USENIX is committed to Open Access to the research presented at our events. Papers and proceedings are freely available to everyone once the event begins. Any video, audio, and/or slides that are posted after the event are also free and open to everyone. Support USENIX and our commitment to Open Access.

@inproceedings {222619,
author = {Natacha Crooks and Matthew Burke and Ethan Cecchetti and Sitar Harel and Rachit Agarwal and Lorenzo Alvisi},
title = {Obladi: Oblivious Serializable Transactions in the Cloud},
booktitle = {13th USENIX Symposium on Operating Systems Design and Implementation (OSDI 18)},
year = {2018},
isbn = {978-1-939133-08-3},
address = {Carlsbad, CA},
pages = {727--743},
url = {https://www.usenix.org/conference/osdi18/presentation/crooks},
publisher = {USENIX Association},
month = oct

Presentation Audio