NexR RHive 2.0

RHive is an R extension facilitating distributed computing via HIVE query. RHive allows easy usage of HQL(Hive SQL) in R, and allows easy usage of R objects and R functions in Hive.

Before installing RHive, you have to have installed Hadoop and Hive

Install Hadoop

1. Single Node
   • Single node installation
2. Cluster Node
   • Cluster node installation
3. set HADOOP_HOME at local machine on which R runs

Install Hive

1. install local machine and remote machine on which NameNode runs or Hive-Server runs.
2. Installation Guide
   • Hive installation guide
3. set HIVE_HOME at local machine on which R runs.
4. launch Hive Server with following command on remote machine. it should be as a background process.
   • $HIVE_HOME/bin/hive --service hiveserver

Install R and Packages

1. install R
   • need to install R on all tasktracker nodes
2. install rJava
   • only install rJava on local machine.
3. install Rserve
   • need to install Rserve on all tasktracker nodes
   • make configuration in path (/etc/Rserv.conf) on all tasktracker nodes. edit this file to add 'remote enable' to allow remote connection.
   • launch all Rserve on all tasktracker nodes.
     • e.q> R CMD Rserve
4. setting tasktracker nodes
   • add R_HOME path at $HADOOP_HOME/conf/hadoop-env.sh
     • e.q> export R_HOME=/usr/lib/R
5. install RUnit

Install RHive

1. Requirements
   • ant (in order to build java files)
2. Installing RHive
   1. Download source code: git clone https://github.com/nexr/RHive.git
   2. Change your working directory: cd RHive
   3. Set the environment variables HIVE_HOME and HADOOP_HOME: export HIVE_HOME=/path/to/your/hive/directory export HADOOP_HOME=/path/to/your/hadoop/directory
   4. Build java files using ant: ant build
   5. Build RHive: R CMD build RHive
   6. Install RHive: R CMD INSTALL RHive_.tar.gz

Loading RHive and connecting to Hive

1. Set the environment variables HIVE_HOME and HADOOP_HOME:
   • Set the environment variables: export HIVE_HOME=/path/to/your/hive/directory export HADOOP_HOME=/path/to/your/hadoop/directory export HADOOP_CONF_DIR=/path/to/your/hadoop/conf/directory
   • Or, add environment variables into Renviron HIVE_HOME=/path/to/your/hive/directory HADOOP_HOME=/path/to/your/hadoop/directory HADOOP_CONF_DIR=/path/to/your/hadoop/conf/directory
2. launch R

library(RHive)
rhive.connect(host, port, hiveServer2)

Tutorials

• RHive user guide

Requirements

• Java 1.6
• R 2.13.0
• Rserve 0.6-0
• rJava 0.9-0
• Hadoop 0.20.x (x >= 1)
• Hive 0.8.x (x >= 0)