Google Research

Dremel: Interactive Analysis of Web-Scale Datasets

  • Sergey Melnik
  • Andrey Gubarev
  • Jing Jing Long
  • Geoffrey Romer
  • Shiva Shivakumar
  • Matt Tolton
  • Theo Vassilakis
Proc. of the 36th Int'l Conf on Very Large Data Bases (2010), pp. 330-339

Abstract

Dremel is a scalable, interactive ad-hoc query system for analysis of read-only nested data. By combining multi-level execution trees and columnar data layout, it is capable of running aggregation queries over trillion-row tables in seconds. The system scales to thousands of CPUs and petabytes of data, and has thousands of users at Google. In this paper, we describe the architecture and implementation of Dremel, and explain how it complements MapReduce-based computing. We present a novel columnar storage representation for nested records and discuss experiments on few-thousand node instances of the system.

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