1. Hbase – NoSQL Database
Presented By:
13MCEC13

2. What is Hbase?
HBase is column-oriented, distributed, scalable,versioned bigdata store.
Hbase can manage Stuctured and semi-structured data.
It is Databse mangement system runs on the top of HDFS. Hbase uses HDFS for storage.

3. Installation Download Installing hbase linux Installing hbase windows
Installing hbase linux
Installing hbase windows

4. HDFS vs. HBase
HDFS is a distributed file system that is well suited for storing large files.
HDFS
Is suited for High Latency operations batch processing
Data is primarily accessed through MapReduce
Is designed for batch processing and hence doesn’t have a concept of random reads/writes
HBase
Is built for Low Latency operations.
Provides access to single rows from billions of records.
Data is accessed through shell commands, Client APIs in Java, REST, Avro or Thrift

5. Hbase run modes Standalone
Hbase doesn't use HDFS. Used local file system.
Doesn't provide durability.
Distributed
Pseudo distributed (Local File System and HDFS)
Fully distributed (HDFS)

6. Hbase architecture

7. Hmaster and Region Server
Manages and monitors cluster.
Assign regions to Region Server.
Check health of Region Servers.
Load balancing.
Region Server
Contains multiple Regions.
Split regions automatically.
Handles read-write request.
Communicates with client directly.

8. Zookeeper Zookeeper Keeps track of region servers in Hbase
Recover region server crashes.
Master gets details of Region Servers by contaction Zookeeper.

9. Hbase Data Model
Data Model in Hbase is designed to accomodate Semi- structured data which varies in size,data type,columns.
Data model makes it easier to partition data and distribute it across the cluster.

10. Data model elements Data model consistes of Tables Rows
Column families
Columns
Cells
Version

11. ( row , column family , column,
timestamp )-> value

12. Hbase features Horizontal Scalability Consistent read write
Automatic Sharding
Automatic failover support between Region Servers

13. Jruby-based Shell COMMAND GROUPS: 1) Group name: general
Commands: version, whoami
2)Group name: ddl
Commands: alter, create, describe, disable, disable_all, drop, drop_all, enable, enable_all, exists, is_disabled, is_enabled, list
3) Group name: dml
Commands: count, delete, deleteall, get, get_counter, incr, put, scan, truncate

14. Contd.. 4) Group name: security Commands: grant, revoke
you can get detailed help for group :
help 'security'
you can get detailed help for commands :
help 'grant'

15. Basic Shell Create table and column family Create 'table' , 'f1','f2'
Create 'table' , { NAME=>'f1'},{ NAME=>'f2'}
Add column family to table
hbase> alter 't1', NAME => 'f1', VERSIONS => 5
To delete the 'f1' column family in table 't1', do:
hbase> alter 't1', NAME => 'f1', METHOD => 'delete' or
hbase> alter 't1', 'delete' => 'f1'

16. Contd. Manually Insert Data into Hbase create 'cars', 'vi'
Let’s insert 3 column qualifies (make, model, year) and the associated values into the first row (row1).
1) put 'cars', 'row1', 'vi:make', 'bmw', timestamp
put 'cars', 'row1', 'vi:model', '5 series'
put 'cars', 'row1', 'vi:year', '2012'
2) put 'cars', 'row2', 'vi:make', 'mercedes'
put 'cars', 'row2', 'vi:model', 'e class'

17. Contd. Scan a Table Scan 'cars'
scan 'cars', {COLUMNS => ['vi:make']}
Get A single row
get 'cars', 'row1'
get 'cars', 'row1', {TIMERANGE => [ts1, ts2]}
get 'cars', 'row1', {COLUMN => ['vi:model', 'vi:year']}
Delete a Cell (Value)
delete 'cars', 'row2', 'vi:year'

18. Contd. Count(counts number of rows in a table) count 'cars'
Incr(Increments a cell 'value')
incr 't1', 'r1', 'c1'
incr 't1', 'r1', 'c1', 1
incr 't1', 'r1', 'c1', 10
Disable and Delete a Table
disable 'cars'
drop 'cars'

19. Contd. Enable table enable 'cars'
List (List all tables in hbase. Optional regular expression parameter could be used to filter the output)
list
list 'abc.*'
Truncate
Disables, drops and recreates the specified table.
truncate 'cars'

20. Thank You