Sujaya Maiyya

As a Computer Science Ph.D. candidate at UC Santa Barbara, I design, prototype and evaluate protocols for managing large-scale data in a performance efficient and secure manner. The research topics I am interested in are Large Scale Data Management, Distributed Systems, and Blockchain. My research focuses on integrating cryptographic techniques with databases to mitigate the stringent trust-requirements in traditional database systems. The increasing popularity of blockchains and the use of third-party cloud -- scenarios in which the servers storing and processing the data are not trusted -- makes my research interests highly relevant to today's problems. I am co-advised by Prof.Amr El Abbadi and Prof.Divy Agrawal.

I am a recipient of IBM PhD Fellowship 2020 and Google PhD Fellowship 2020 (declined).


PhD in Computer Science University of California, Santa Barbara (Jan 2018 - present)
MSc in Computer Science University of California, Santa Barbara (Sept 2016 - Dec 2017)
BE in Information Science PESIT, Bangalore (Aug 2010 - May 2014)


Sujaya Maiyya, Ishtiyaque Ahmad, Divyakant Agrawal, Amr El Abbadi "Samya: Geo-Distributed Data System for High Contention Data Aggregates" ICDE 2021 [pdf].

Fuheng Zhao, Sujaya Maiyya, Ryan Wiener, Divyakant Agrawal, Amr El Abbadi "KLL±: Approximate Quantile Sketches over Dynamic Datasets" VLDB 2021 [pdf].

Sujaya Maiyya, Danny HB Cho, Divyakant Agrawal, Amr El Abbadi "Fides: Managing Data on Untrusted Infrastructure" ICDCS 2020 [pdf].

Mohammad Javad Amiri, Sujaya Maiyya, Divyakant Agrawal, Amr El Abbadi "SeeMoRe: A Fault-Tolerant Protocol for Hybrid Cloud Environments" ICDE 2020 [pdf].

Sujaya Maiyya, Faisal Nawab, Divyakant Agrawal, Amr El Abbadi "Unifying Consensus and Atomic Commitment for Effective Cloud Data Management" VLDB 2019 [pdf][ppt].

Victor Zakhary, Mohammad Javad Amiri, Sujaya Maiyya, Divy Agrawal, Amr El Abbadi "Towards Global Asset Management in Blockchain Systems" BCDL co-located with VLDB 2019 [pdf].

Sujaya Maiyya, Victor Zakhary, Mohammad Javad Amiri, Divy Agrawal, Amr El Abbadi "Database and Distributed Computing Foundations of Blockchains" SIGMOD 2019 (tutorial) [pdf].

Sujaya Maiyya, Victor Zakhary, Divy Agrawal, Amr El Abbadi "Database and Distributed Computing Fundamentals for Scalable, Fault-tolerant, and Consistent Maintenance of Blockchains" VLDB 2018 (tutorial) [pdf] [slides].

Vaibhav Arora, RKS Babu, Sujaya Maiyya, Divyakant Agrawal, Amr El Abbadi, Xun Xue, Yanan Zhi and Jianfeng Zhu "Dynamic Timestamp Allocation for Reducing Transaction Aborts" IEEE Cloud 2018 [pdf].


  • Received Outstanding Graduate Student 2018-19 award in the CS department at UCSB.
  • Received travel awards to attend CRA-W grad cohort 2019 and GHC - 2017.
  • Have been elected as a Graduate Student Representative for 2 consecutive years at UCSB.
  • Recipient of VLDB Travel Grant in 2018.
  • Secured Spot Bonus incentive for leadership qualities and timely delivery of a critical product in Citrix.
  • Four times a recipient of SAP Labs Scholarship for securing the highest CGPA in the department at PESIT.
  • Received Summer Research Fellowship from Ministry of Human Resource Development, India.

  • Ongoing Research

    Towards Managing Data in an Untrusted Setting

    One of my ongoing research projects is to build a data management system that can operate in an untrusted setting. Small enterprises are increasingly renting storage servers from third party cloud providers. These vendors are prone to external attacks and may also be intentionally malicious and try to manipulate the data is ways inconspicuous to the renter. The increasing popularity of blockchains is an indication that we are moving towards robust systems that can work without any trust assumptions. Motivated by the need to develop trust-free systems, in my ongoing research, I aim to develop 1) A DBMS that tolerates malicious failures in many of its components, 2) A byzantine distributed atomic commitment that allows an application to execute transactions on data stored across different untrusted servers. An abstract for the project can be found here.

    Hybrid fault-tolerant protocols

    With the increase in small scale enterprises, there is increasing demand to rent servers from public cloud providers. Small enterprises usually own a few trusted servers in their compute fleet but would be insufficient to provide the required fault-tolerance or to cater to geographically distributed customers. Many state machine replication protocols have been developed thatcater to either a fully trusted environment or a completely un-trusted environment. In a collaborative project, I helped develop a replication protocol that leverages the trust of a private cloud and the scalability of a public cloud. The protocol tolerates a bounded numbers of crash and Byzantine failures, while providing the correctness and liveness required by a replication protocol. The use of a hybrid protocol also helps in reducing the number of servers to be rented from external providers. With an ever-growing need for data computation and storage, a practical solution such as ours will help small scale businesses in providing online service geographically with optimal costs. This work is currently under review.

    Teaching Experience

    I have served as a Teaching Assistant in the Computer Science department at UCSB for two years. The courses I have taught are:
  • CS130A: Data Structures and Algorithms using C++ - Fall 2018, Winter 2018
  • CS171: Distributed Systems - Spring 2018
  • CS32: Object Oriented Design - Fall 2017
  • CS16: Problem Solving using C++ - Spring 2017
  • CS56: Advanced Application Programming - Winter 2017

  • Industrial Experience

    PhD Software Engineer Intern - Cloud Infra - Google (June 2018 - September 2018)

    I worked in Quotaserver – a distributed bin counting - team. During my internship, I identified the performance bottleneck of Quotaserver which was due to the backend database, Spanner. I optimized the performance of Quotaserver by sharding a single key in Spanner across different cells. The optimization resulted in 2.3x performance gain and 51% reduction in latency of the system.

    Software Engineer Intern - Ads - Google (June 2017 - September 2017)

    I worked in Google Ads group to introduce a new type of scheduler for Ads report generation that produced timely reports for customers across the globe. The project went in production and impacted many ad publishers, redefining the existing client SLAs.

    Software Developer - NetScaler - Citrix R&D (Feb 2014 - July 2016)

    I worked with Cloud Orchestration team of NetScaler in developing various features for NetScaler Control Center (NCC). I successfully drove the project of adding a new feature in NCC which enabled major CloudStack tenants to use load-balancing features of NetScaler. I have also committed fixes into OpenSource Apache CloudStack. I took ownership of extending admin partition feature of NetScaler to various cloud users, thus eliminating hardware constraints required for loadbalancing.