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These notes are for HCatalog 0.5.0 release.
HCatalog is a table management and storage management layer for Hadoop that
enables users with different data processing tools – Pig, MapReduce, and Hive,
to easily share data on the grid. HCatalog’s table abstraction presents users
with a relational view of data in the Hadoop distributed file system (HDFS)
and ensures that users need not worry about where or in what format their data
is stored – RCFile format, text files, sequence files.
System Requirements
1. Java 1.6.x or newer, preferably from Sun. Set JAVA_HOME to the root of your
Java installation
2. Ant build tool, version 1.8 or higher: - to build
source only
3. This release is compatible with Hadoop 1.0.3.
4. This release is compatible with Pig 0.8.1, Pig 0.9.1, and 0.9.2.
5. This release is compatible with Hive 0.10.0
Trying the Release
1. Download hcatalog-src-0.5.0-incubating.tar.gz
2. Follow the directions at
3. If you are upgrading from a previous HCatalog release, please note
the Hive dependency has been updated to 0.10.0. Please see the Hive
upgrade documentation as appropriate for your current Hive version.
Relevant Documentation
These notes are for HCatalog 0.5.0 release.
Changes Since Last Release
Major changes since the last release include:
- HCatalog is now published in the Apache Maven repository.
- New web services API to HCatalog: webhcat
- Major notifications update
- Build has been updated to provide per-submodule artifacts.
- Improved pig adapter support.
- Updated to Hive 0.10.0.
- Many improvements and bug fixes.
For a full list of changes see CHANGES.txt located in the same directory as this file.
Backward Incompatibilities
- HCatalog no longer publishes a monolithic jar with all classes. Instead,
per-submodule jars are published. This allows users to pull in just the
needed dependencies when integrating HCatalog with their system.
HBase integration with HCatalog is experimental and not yet ready for production use.