Cloud computing promotes economies of scale by sharing software and hardware resources across multiple tenants. To date, there has been relatively little research on how MDE can best support multi-tenant cloud applications, where there is a need to separate the logic and data of multiple tenants. In this position paper, we sketch out five key research opportunities for applying MDE to multi-ten...

DBMSs powering cloud application platforms must serve large numbers of applications with unpredictable load patterns while minimizing the operating cost leveraging the underlying pay-per-use infrastructure. We have designed ElasTraS, an Elastic TranSactional relational database for cloud platforms. ElasTraS is a confluence of two major design philosophies: traditional relational database system...

Most existing cloud workflow modeling approaches focus on how to support business process customization for multiple tenants. But there are many factors to be considered in actual cloud workflow modeling, such as how to model interaction between different tenants’ business processes while protecting their privacy respectively, and how to facilitate the reuse of common process fragments for diff...

The emerging ecosystem of cloud applications leads to significant inter-tenant communication across a datacenter’s internal network. This poses new challenges for cloud network sharing. Richer inter-tenant traffic patterns make it hard to offer minimum bandwidth guarantees to tenants. Further, for communication between economically distinct entities, it is not clear whose payment should dictate...

Public housing authorities (PHAs) are entering a brave new world. Major proposed changes to the public housing program will force PHAs to compete with private sector providers for tenants. To succeed, they will have to act more like entrepreneurial market participants: to change their management practices, the types of tenants they house, and the kinds of developments they operate, and to attra...

Cloud computing promotes economies of scale by sharing software and hardware resources across multiple tenants. To date, there has been relatively little research on how MDE can best support multi-tenant cloud applications, where there is a need to separate the logic and data of multiple tenants. In this position paper, we sketch out five key research opportunities for applying MDE to multi-ten...

We evaluated the implementation process of Richmond, California's citywide smoke-free multiunit housing ordinance. We conducted semistructured focus groups with multiunit housing tenants, owners, and managers. Residents understood the harms of secondhand smoke but lacked accurate information about the ordinance and questioned its enforceability. They shared concerns that the city lacked cessati...

La Soledad case is illustrative of the contracting issue under conditions where reputation as an enforcement device is ineffective, and where there is no coercive power. Initially, tenancy practices were organized among local actors, on the basis of personal relationships; contractual enforcement was not a critical issue. The introduction of a new crop (potato) by ‘outsiders’ --entrepreneur-typ...

Software-as-a-Service using admission control has been considered as the next generation software delivery model that shares the services among different tenants to improve the utility rate. A major feature of the admission control is that the tenant’s resources are usually shared by the cloud. While the tenant’s enjoy the convenience of resources being obtained from the cloud structure, they f...

Consensus is at the core of many production-grade distributed systems. Given the prevalence of these systems, it is important to offer consensus as a cloud service. To match the multi-tenant requirements of the cloud, consensus as a service must provide performance guarantees, and prevent aggressive tenants from disrupting the others. Fulfilling this goal is not trivial without overprovisioning...