On the support of versioning in distributed key-value stores

The ability to access and query data stored in multiple versions is an important asset for many applications, such as Web graph analysis, collaborative editing platforms, data forensics, or correlation mining. The storage and retrieval of versioned data requires a specific API and support from the storage layer. The choice of the data structures used to maintain versioned data has a fundamental impact on the performance of insertions and queries. The appropriate data structure also depends on the nature of the versioned data and the nature of the access patterns. In this paper we study the design and implementation space for providing versioning support on top of a distributed key-value store (KVS). We define an API for versioned data access supporting multiple writers and show that a plain KVS does not offer the necessary synchronization power for implementing this API. We leverage the support for listeners at the KVS level and propose a general construction for implementing arbitrary types of data structures for storing and querying versioned data. We explore the design space of versioned data storage ranging from a flat data structure to a distributed sharded index. The resulting system, \system, is implemented on top of an industrial-grade open-source KVS, Infinispan. Our evaluation, based on real-world Wikipedia access logs, studies the performance of each versioning mechanisms in terms of load balancing, latency and storage overhead in the context of different access scenarios

Old Reliable Coffee

Old Reliable Coffee label for Old Reliable Coffeehttps://digitalmaine.com/arc_trademarks/1088/thumbnail.jp

Personal Papers (MS 80-0002)

Letter from Reliable Shirt Hospital to H. Kempner informing that the package of shirts is received and that the operator who does the work that the shirts require has been out ill. That being the reason for delay in returning the shirts, it might take another three or four weeks to repair the shirts

[Marketing for Tourism and Museums: A Natural Collaboration]

Sound cassette titled "Marketing for Tourism and Museums: A Natural Collaboration.