Abstract

Geo-distributed DBMSes often do not support strictly-serializable transactions at all, or limit transactions to only a single region. Those that offer this support force the programmer to either give up low-latency regional writes or use a restricted programming model. We show that these compromises are no longer necessary in modern datacenters for workloads with regional locality, thanks to advances in low-latency datacenter networks and DBMS designs. We present Chablis, a scalable, geo-distributed, multi-versioned transactional key-value store. Chablis provides a general interface supporting range and point reads, as well as writes within multistep strictly-serializable ACID transactions. It offers fast (i.e., low latency) read-write transactions accessing data homed in a single region, and global strictly-serializable lock-free snapshot reads.