Sajjad Rizvi Email & Phone Number

Waterloo, Ontario, Canada

Waterloo, Ontario, Canada

Waterloo, Ontario, Canada

⮕ Kawkab: A Cloud-based Streaming Data Storage System for Timeseries Data• Designed and developed a high-performance streaming data storage middleware for timeseries data, supporting high-throughput data ingestion, low-latency reads, parallel historical queries, and cloud-based data persistence• Developed a novel append-only timeseries index based on post-order heaps to reduce data staleness and minimize latency of range queries to access recently received data• Developed a non-blocking timer queue data structure to ensure non-blocking concurrent execution and to minimize performance overhead of repeated tasks, using CAS operations and Java concurrent queues• Systems/tools used: Java-based implementation, ZooKeeper, Thrift RPC, MinIO object store, evaluation scripts in Python, evaluation using local cluster and Amazon EC2, EBS, and S3⮕ Canopus: A Scalable Consensus Protocol for Geo-Distributed Applications• Designed and developed Canopus, a scalable leaderless consensus protocol for large-scale geo-distributed applications• Developed pipelining and read optimizations to achieve high performance• Replaced ZooKeeper’s Zab consensus protocol with Canopus protocol by refactoring ZooKeeper• Systems/tools used: Implementation in Java, Go client, evaluation scripts in Python, ZooKeeper, Amazon cloud for evaluation⮕ Optimizing Reads in Distributed Filesystems Through a Network/Filesystem Co-Design Approach• Designed and developed a novel heuristic to optimize file reads in distributed filesystems• Implemented the heuristic as an SDN controller application, monitoring the network, building a network model, and responding to replica selection requests• Integrated replica selection in a custom-built Mayflower filesystem and HDFS• Emulated a 64-node datacenter network using Mininet across a cluster of machines• Systems/tools used: Java-based SDN controller application, Python based Mininet network emulator, Python-based evaluation scripts, HDFS

Islāmābād, Pakistan

• Lead a team of five members to build a network switch for Cavium Network’s NPUs• Conducted interviews and hired new team members• Customized and ported Open vSwitch to NPU firmware to exploit various on-chip offloads and minimize CPU utilization of its host machine• Collaborated with Dell Inc. and advised the development in a parallel project, building a split SDN data-plane for a Dell switch prototype• Systems/tools used: C based Cavium Network NPU firmware, Octeon SDK, Open vSwitch, OProfile

Espoo, Southern Finland, Finland

• Developed a heuristic to reduce network traffic overhead due to traffic anomalies in Bloom filter-based multicast• Implemented the heuristic in NS3• Simulated a multicast network in NS3 using Rockefuel topologies for performance evaluation

Espoo, Southern Finland, Finland

• Investigated taking advantage of higher-end hardware in mobile devices• Explored configuring and using Hadoop in Nokia N900 phones

Islāmābād, Pakistan

• In a collaboration with Wichorus Inc., I developed and evaluated an algorithm to classify eMule traffic from the network stream, to be implemented in high-speed network monitoring devices• Implemented an anomaly detection system based on a design presented in a research article

• Developed innovative methods to upload large volumes of seismic data into a Teradata warehouse, using various tools and technologies including web services, database and mining tools, and Teradata utilities• Developed a web interface using Java Struts framework

Doctor Of Philosophy - Phd, Computer Science

Master Of Science (Ms), Computer Science

M.Sc., Computer Science

Bachelor'S Degree, Computer Science