June 2018
Beginner to intermediate
210 pages
5h 12m
English
Content preview from Apache Hive Essentials - Second Edition
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Job engine
Hive supports running jobs on different engines. The choice of engine will also impact the overall performance. However, this is a bigger change compared to the other settings. Also, this change requires a service restart rather than temporarily make it effective in command-line session. Here is the syntax to set the engine as well as details for each of them:
SET hive.execution.engine=<engine>; -- <engine> = mr|tez|spark
- mr: This is the default engine, MapReduce. It was deprecated after Hive v2.0.0.
- tez: Tez (http://tez.apache.org/) is an application framework built on Yarn that can execute complex Directed Acyclic Graphs (DAGs) for general data-processing tasks. Tez further splits map and reduce jobs into smaller tasks and ...
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