////
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
////

= Apache HBase&#153; Home

.Welcome to Apache HBase(TM)
link:http://www.apache.org/[Apache HBase(TM)] is the link:http://hadoop.apache.org[Hadoop] database, a distributed, scalable, big data store.

.When Would I Use Apache HBase?
Use Apache HBase when you need random, realtime read/write access to your Big Data. +
This project's goal is the hosting of very large tables -- billions of rows X millions of columns -- atop clusters of commodity hardware.

Apache HBase is an open-source, distributed, versioned, non-relational database modeled after Google's link:http://research.google.com/archive/bigtable.html[Bigtable: A Distributed Storage System for Structured Data] by Chang et al.

Just as Bigtable leverages the distributed data storage provided by the Google File System, Apache HBase provides Bigtable-like capabilities on top of Hadoop and HDFS.

.Features
- Linear and modular scalability.
- Strictly consistent reads and writes.
- Automatic and configurable sharding of tables
- Automatic failover support between RegionServers.
- Convenient base classes for backing Hadoop MapReduce jobs with Apache HBase tables.
- Easy to use Java API for client access.
- Block cache and Bloom Filters for real-time queries.
- Query predicate push down via server side Filters
- Thrift gateway and a REST-ful Web service that supports XML, Protobuf, and binary data encoding options
- Extensible jruby-based (JIRB) shell
- Support for exporting metrics via the Hadoop metrics subsystem to files or Ganglia; or via JMX

.Where Can I Get More Information?
See the link:book.html#arch.overview[Architecture Overview], the link:book.html#faq[FAQ] and the other documentation links at the top!

.Export Control
The HBase distribution includes cryptographic software. See the link:export_control.html[export control notice].

== News
Feb 17, 2015:: link:http://www.meetup.com/hbaseusergroup/events/219260093/[HBase meetup around Strata+Hadoop World] in San Jose

January 15th, 2015:: link:http://www.meetup.com/hbaseusergroup/events/218744798/[HBase meetup @ AppDynamics] in San Francisco

November 20th, 2014::  link:http://www.meetup.com/hbaseusergroup/events/205219992/[HBase meetup @ WANdisco] in San Ramon

October 27th, 2014:: link:http://www.meetup.com/hbaseusergroup/events/207386102/[HBase Meetup @ Apple] in Cupertino

October 15th, 2014:: link:http://www.meetup.com/HBase-NYC/events/207655552[HBase Meetup @ Google] on the night before Strata/HW in NYC

September 25th, 2014:: link:http://www.meetup.com/hbaseusergroup/events/203173692/[HBase Meetup @ Continuuity] in Palo Alto

August 28th, 2014:: link:http://www.meetup.com/hbaseusergroup/events/197773762/[HBase Meetup @ Sift Science] in San Francisco

July 17th, 2014:: link:http://www.meetup.com/hbaseusergroup/events/190994082/[HBase Meetup @ HP] in Sunnyvale

June 5th, 2014:: link:http://www.meetup.com/Hadoop-Summit-Community-San-Jose/events/179081342/[HBase BOF at Hadoop Summit], San Jose Convention Center

May 5th, 2014:: link:http://www.hbasecon.com[HBaseCon2014] at the Hilton San Francisco on Union Square

March 12th, 2014:: link:http://www.meetup.com/hbaseusergroup/events/160757912/[HBase Meetup @ Ancestry.com] in San Francisco

View link:old_news.html[Old News]
