HIVE INSTALLATION

This section refers to the installation settings of Hive on a standalone systemas well as on a system existing as a node in a cluster.

INTRODUCTION

Apache Hive is a data warehouse infrastructure built on top of Hadoop for providing data summarization, query, and analysis. Apache Hive supports analysis of large datasets stored in Hadoop’s HDFS and compatible file systems such as Amazon S3 filesystem. It provides an SQL-like language called HiveQL(Hive Query Language) while maintaining full support for map/reduce.

Hive Installation

Installing HIVE:

• Browse to the link: http://apache.claz.org/hive/stable/

• Click the apache-hive-0.13.0-bin.tar.gz

• Save and Extract it

  Commands

  user@ubuntu:~$  cd  /usr/lib/user@ubuntu:~$  sudo mkdir hiveuser@ubuntu:~$  cd Downloadsuser@ubuntu:~$  sudo mv apache-hive-0.13.0-bin /usr/lib/hive

Setting Hive environment variable:

Commands

user@ubuntu:~$  cduser@ubuntu:~$  sudo gedit  ~/.bashrc

Copy and paste the following lines at end of the file

# Set HIVE_HOMEexport HIVE_HOME="/usr/lib/hive/apache-hive-0.13.0-bin"PATH=$PATH:$HIVE_HOME/binexport PATH

Setting HADOOP_PATH in HIVE config.sh

Commands

user@ubuntu:~$ cd  /usr/lib/hive/apache-hive-0.13.0-bin/binuser@ubuntu:~$ sudo gedit hive-config.sh

Go to the line where the following statements are written

# Allow alternate conf dir location.HIVE_CONF_DIR="${HIVE_CONF_DIR:-$HIVE_HOME/conf"export HIVE_CONF_DIR=$HIVE_CONF_DIRexport HIVE_AUX_JARS_PATH=$HIVE_AUX_JARS_PATH

Below this write the following

export HADOOP_HOME=/usr/local/hadoop    (write the path where hadoop file is there)

Create Hive directories within HDFS

Command

user@ubuntu:~$   hadoop fs -mkdir /usr/hive/warehouse

Setting READ/WRITE permission for table

Command

user@ubuntu:~$  hadoop fs -chmod g+w /usr/hive/warehouse

HIVE launch

Command

user@ubuntu:~$  hive

Hive shell will prompt:

OUTPUT

Shell will look like

Logging initialized using configuration in jar:file:/usr/lib/hive/apache-hive-0.13.0-bin/lib/hive- common-0.13.0.jar!/hive-log4j.propertieshive>

Creating a database

Command

hive> create database mydb;

OUTPUT

OKTime taken: 0.369 secondshive>

Configuring hive-site.xml:

Open with text-editor and change the following property

<property>    <name>hive.metastore.local</name>    <value>TRUE</value>    <description>controls whether to connect to remove metastore server or open a new metastore server in Hive Client JVM</description></property><property>    <name>javax.jdo.option.ConnectionURL</name>    <value>jdbc:mysql://usr/lib/hive/apache-hive-0.13.0-bin/metastore_db? createDatabaseIfNotExist=true</value>    <description>JDBC connect string for a JDBC metastore</description></property><property>    <name>javax.jdo.option.ConnectionDriverName</name>    <value>com.mysql.jdbc.Driver</value>    <description>Driver class name for a JDBC metastore</description></property><property>    <name>hive.metastore.warehouse.dir</name>    <value>/usr/hive/warehouse</value>    <description>location of default database for the warehouse</description> </property>

Writing a Script

Open a new terminal (CTRL+ALT+T)

user@ubuntu:~$      sudo gedit sample.sqlcreate database sample;use sample;create table product(product int, productname string, price float)[row format delimited fields terminated by ',';]describe product;

load data local inpath ‘/home/hduser/input_to_product.txt’ into table product

select * from product;

SAVE and CLOSE

user@ubuntu:~$ sudo gedit input_to_product.txtuser@ubuntu:~$ cd /usr/lib/hive/apache-hive-0.13.0-bin/ $ bin/hive -f /home/hduser/sample.sql