apache/hive

Apache Hive (TM)

The Apache Hive (TM) data warehouse software facilitates reading, writing, and managing large datasets residing in distributed storage using SQL. Built on top of Apache Hadoop (TM), it provides:

• Tools to enable easy access to data via SQL, thus enabling data warehousing tasks such as extract/transform/load (ETL), reporting, and data analysis

• A mechanism to impose structure on a variety of data formats

• Access to files stored either directly in Apache HDFS (TM) or in other data storage systems such as Apache HBase (TM)

• Query execution using Apache Tez framework, designed for interactive query, and has substantially reduced overheads versus MapReduce.

Hive provides standard SQL functionality, including many of the later 2003 and 2011 features for analytics. These include OLAP functions, subqueries, common table expressions, and more. Hive's SQL can also be extended with user code via user defined functions (UDFs), user defined aggregates (UDAFs), and user defined table functions (UDTFs).

Hive is not designed for online transaction processing. It is best used for traditional data warehousing tasks where the amount of data processed is large enough to require a distributed system. Hive is designed to maximize scalability (scale out with more machines added dynamically to the Hadoop cluster), performance, extensibility, fault-tolerance, and loose-coupling with its input formats.

General Info

For the latest information about Hive, please visit out website at:

http://hive.apache.org/

Getting Started

• Installation Instructions and a quick tutorial: https://hive.apache.org/development/gettingstarted-latest https://hive.apache.org/development/quickstart

• Instructions to build Hive from source: https://hive.apache.org/development/gettingstarted-latest/#building-hive-from-source

• A longer tutorial that covers more features of HiveQL: https://hive.apache.org/docs/latest/user/tutorial

• The HiveQL Language Manual: https://hive.apache.org/docs/latest/language/languagemanual

Requirements

Java

Hadoop

• Hadoop 3.x

Upgrading from older versions of Hive

• Hive includes changes to the MetaStore schema. If you are upgrading from an earlier version of Hive it is imperative that you upgrade the MetaStore schema by running the appropriate schema upgrade scripts located in the scripts/metastore/upgrade directory.

• We have provided upgrade scripts for MySQL, PostgreSQL, Oracle, Microsoft SQL Server, and Derby databases. If you are using a different database for your MetaStore you will need to provide your own upgrade script.

Useful mailing lists

1. [email protected] - To discuss and ask usage questions. Send an empty email to [email protected] in order to subscribe to this mailing list.

2. [email protected] - For discussions about code, design and features. Send an empty email to [email protected] in order to subscribe to this mailing list.

3. [email protected] - In order to monitor commits to the source repository. Send an empty email to [email protected] in order to subscribe to this mailing list.