HDFS and Linux Commands in Hive Shell

posted on Nov 20th, 2016

Apache Hive

Apache Hive is a data warehouse infrastructure built on top of Hadoop for providing data summarization, query, and analysis. Hive gives an SQL-like interface to query data stored in various databases and file systems that integrate with Hadoop. The traditional SQL queries must be implemented in the MapReduce Java API to execute SQL applications and queries over a distributed data. Hive provides the necessary SQL abstraction to integrate SQL-like Queries (HiveQL) into the underlying Java API without the need to implement queries in the low-level Java API. Since most of the data warehousing application work with SQL based querying language, Hive supports easy portability of SQL-based application to Hadoop.

Pre Requirements

1) A machine with Ubuntu 14.04 LTS operating system

2) Apache Hadoop 2.6.4 pre installed (How to install Hadoop on Ubuntu 14.04)

3) Apache Hive 2.1.0 pre installed (How to Install Hive on Ubuntu 14.04)

HDFS and Linux Commands in Hive Shell

Step 1 - Change the directory to /usr/local/hive/bin

$ cd /usr/local/hive/bin

Step 2 - Enter into hive shell

$ hive

HDFS Commands

You can use all hdfs commands

hive> dfs -ls;

Linux Commands

Prints the hostname

hive> !hostname;

Displays the present working directory

hive> !pwd;

Prints the message

hive> !echo "hello hive";

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Labels : Hive Installation With Derby Database Metastore   Hive Installation With MySQL Database Metastore   Beeline Client Usage   hiveserver2 and Web UI usage   WordCount hiveQL Execution   Hive Metastore Configuration   Hive Command Line Interface   Hive Shell Commands usage   Hive Distributed Cache   Customizing hive logs   Database Commnds Usage   Table Commands Usage   Hive Partitioning Configuration   Hive Bucketing Configuration   UDFs Java Example   UDAFs Java Example   UDTF Java Example   Hive JDBC client Java Example   Hive Web Interface (HWI)   HiveQL Examples