How to enable LLAP in Hive 3?

Question

I installed Hive 3.1.0 on top Hadoop 3.1.1(without using Ambari). How can I enable LLAP feature in Hive.

Answer 1

Configuring LLAP is covered in Hive Configuration Properties: LLAP section. To enable it you need to change hive.llap.execution.mode.

The document describes how to set hive.llap.execution.mode:

• Default Value: none
• Possible Values:
  • none: not tried
  • map: only map operators are considered for llap
  • all: every operator is tried; but falls back to no-llap in case of problems
  • only: same as "all" but stops with an exception if execution is not possible (as of 2.2.0 with HIVE-15135)
  • auto: conversion is controlled by hive

For more information about LLAP refer to https://cwiki.apache.org/confluence/display/Hive/LLAP.

Answer 2

This is a documentation for setting up LLAP (Apache Hive Performance Tuning ) in hortonworks:

https://docs.hortonworks.com/HDPDocuments/HDP3/HDP-3.1.0/performance-tuning/content/hive_setting_up_llap.html