Masters Theses

Keywords and Phrases

Caching; Cloud Databases; Decaying Weights; DTN; Paxos; Policy Consistency


"In distributed transactional systems deployed over some massively decentralized cloud servers, access policies are typically replicated. Interdependencies ad inconsistencies among policies need to be addressed as they can affect performance, throughput and accuracy. Several stringent levels of policy consistency constraints and enforcement approaches to guarantee the trustworthiness of transactions on cloud servers are proposed. We define a look-up table to store policy versions and the concept of "Tree-Based Consistency" approach to maintain a tree structure of the servers. By integrating look-up table and the consistency tree based approach, we propose an enhanced version of Two-phase validation commit (2PVC) protocol integrated with the Paxos commit protocol with reduced or almost the same performance overhead without affecting accuracy and precision.

A new caching scheme has been proposed which takes into consideration Military/Defense applications of Delay-tolerant Networks (DTNs) where data that need to be cached follows a whole different priority levels. In these applications, data popularity can be defined not only based on request frequency, but also based on the importance like who created and ranked point of interests in the data, when and where it was created; higher rank data belonging to some specific location may be more important though frequency of those may not be higher than more popular lower priority data. Thus, our caching scheme is designed by taking different requirements into consideration for DTN networks for defense applications. The performance evaluation shows that our caching scheme reduces the overall access latency, cache miss and usage of cache memory when compared to using caching schemes"--Abstract, page iv.


Madria, Sanjay Kumar

Committee Member(s)

Jiang, Wei
Erçal, Fikret


Computer Science

Degree Name

M.S. in Computer Science


Air Force Research Laboratory (Rome, NY)


Missouri University of Science and Technology

Publication Date

Spring 2018

Journal article titles appearing in thesis/dissertation

  • Cloud transactions adhere to strict policy consistency for improved performance
  • Opportunistic distributed caching for mission-oriented delay-tolerant networks


ix, 71 pages

Note about bibliography

Includes bibliographical references.


© 2018 Dileep Kumar Mardham, All rights reserved.

Document Type

Thesis - Open Access

File Type




Thesis Number

T 11296

Electronic OCLC #