Greenplum: A Hybrid Database for Transactional and Analytical Workloads
Abstract
Demand for enterprise data warehouse solutions to support real-time Online Transaction Processing (OLTP) queries as well as long-running Online Analytical Processing (OLAP) workloads is growing. Greenplum database is traditionally known as an OLAP data warehouse system with limited ability to process OLTP workloads. In this paper, we augment Greenplum into a hybrid system to serve both OLTP and OLAP workloads. The challenge we address here is to achieve this goal while maintaining the ACID properties with minimal performance overhead. In this effort, we identify the engineering and performance bottlenecks such as the under-performing restrictive locking and the two-phase commit protocol. Next we solve the resource contention issues between transactional and analytical queries. We propose a global deadlock detector to increase the concurrency of query processing. When transactions that update data are guaranteed to reside on exactly one segment we introduce one-phase commit to speed up query processing. Our resource group model introduces the capability to separate OLAP and OLTP workloads into more suitable query processing mode. Our experimental evaluation on the TPC-B and CH-benCHmark benchmarks demonstrates the effectiveness of our approach in boosting the OLTP performance without sacrificing the OLAP performance.
Cite
@article{arxiv.2103.11080,
title = {Greenplum: A Hybrid Database for Transactional and Analytical Workloads},
author = {Zhenghua Lyu and Huan Hubert Zhang and Gang Xiong and Haozhou Wang and Gang Guo and Jinbao Chen and Asim Praveen and Yu Yang and Xiaoming Gao and Ashwin Agrawal and Alexandra Wang and Wen Lin and Junfeng Yang and Hao Wu and Xiaoliang Li and Feng Guo and Jiang Wu and Jesse Zhang and Venkatesh Raghavan},
journal= {arXiv preprint arXiv:2103.11080},
year = {2021}
}