1. D W I V E D I S H A S H WAT @ G M A I L . C
OM

2. WHAT IS IT?
It is the Hadoop database,
HBASE
Sclable Reader Writer
Distributed
BigDatastore
Column Oriented
HDFS

3. FEATURES OF HBASE
Scalable.
Automatic failover
Consistent reads and writes.
Sharding of tables
Failover support
Classes for backing hadoop mapreduce jobs
Java API for client access
Thrift gateway and a REST-ful Web
Shell support

4. WHAT IT IS NOT
No sql
No relation
No joins
Not a replacement of RDBMS

5. INTRODUCTION
NoSQL
HBase is a type of "NoSQL" database. "NoSQL" is a general term meaning that the
database isn't an RDBMS which supports SQL as its primary access language.
When we should think of using it
HBase isn't suitable for every problem. We should have lot of data, if data is less
RDBMS is better.
Difference Between HDFS and Hbase
HDFS is a distributed file system that is well suited for the storage of large files. It's
documentation states that it is not, however, a general purpose file system, and
does not provide fast individual record lookups in files. HBase, on the other hand, is
built on top of HDFS and provides fast record lookups (and updates) for large
tables.

6. THINK ON THIS
Facebook, for example, is adding more than 15 TB, and processing daily
Google addint Peta Bytes of data and processing.
Companies stroing Logs, temperature details, and many other prospectives to
store and process, which come in peta byte for which conventional
technologies will days to read the data forget about processing it.

7. WHAT IS COLUMNS ORIENTED MEANS
Grouped by columns,
The reason to store values on a per-column basis instead is based on the
assumption
that, for specific queries, not all of the values are needed.
Reduced I/O

8. COMPONENTS

9. HMASTER
Master server is responsible for monitoring all
RegionServer instances in the cluster, and is
the interface for all metadata changes, it runs
on the server which hosts namenode.
Master controls critical functions such as
RegionServer failover and completing region
splits. So while the cluster can still run for a
time without the Master, the Master should be
restarted as soon as possible.

10. REGIONSERVERS
It is responsible for serving and managing regions,
its like a data node for HBase.
These can be thought of Datanode for Hadoop
cluster. It serve the client request for the data.
It handle the actual data storage and request.
It consists of Regions or in better words tables.
RegionServers are usually configured to run on
servers of HDFS DataNode. Running
RegionServer on the DataNode server has the
advantage of data locality too

11. ZOOKEEPER
Zookeeper is an open source software providing a
highly reliable, distributed coordination service
Entry point for an HBase system
It includes tracking of region servers, where the
root region is hosted

12. API
Interface to HBase
Using these we can we can access HBase and
perform read/write and other operation on
HBase.
REST, Thrift, and Avro
Thrift API framework, for scalable cross-language
services development, combines a software
stack with a code generation engine to build
services that work efficiently and seamlessly
between C++, Java, Python, PHP, Ruby, Erlang,
Perl, Haskell, C#, Cocoa, JavaScript, Node.js,
Smalltalk, OCaml and Delphi and other
languages.

13. QUERIES ?