Shulou(Shulou.com)06/02 Report--

HBase is a NoSQL database.

What is a NoSQL database?

Saving data based on Key-value

NoSQL databases do not support things

Common NoSQL databases:

HBase: HDFS based, column-oriented database

Table---> Contents

Data---> Documents

Redis: A memory-based NoSQL database that supports persistence (RDB, AOF)

Predecessor: MemCached does not support persistence

MongoDB: Document-based NoSQL database (BSON documents, JSON binary)

Cassandra: Column Oriented NoSQL Database

Table structure of HBase

article(table)

rowkey

content

author

comments

title

text

user

content

Article 1

Chicken or egg first?

……

someone

Hand spray

Chickens don't make you.

Articles...

……

……………………

architecture

HBase Environment Deployment:

Native mode---1 host: no HDFS required, data stored directly on the operating system

1. Install JAVA environment, modify environment variables

2. Install HBase

Pseudo-distribution mode---1 host: HDFS support required, data stored directly on HDFS

1. Install JAVA environment, modify environment variables

2. Deploying HDFS pseudo-distributed

3. Deploying HBase Pseudo-Distributed

Full distribution mode---3 hosts: HDFS support required, data stored directly on HDFS

1. Install JAVA environment, modify environment variables

2. Deploying HDFS Fully Distributed

3. Deploying HBase Fully Distributed

HA Full Distribution Mode---3 hosts

Environmental pre-deployment preparation:

Set environment variable vi ~/.bash_profile

HBASE_HOME=/root/training/hbase-1.3.1

export HBASE_HOME

PATH=$HBASE_HOME/bin:$PATH

export PATH

Local mode:

hbase-env.sh

28 export JAVA_HOME=/root/training/jdk1.8.0_144

hbase-site.xml

hbase.rootdir

file:///root/training/hbase-1.3.1/data

Start HBase: start-hbase.sh

pseudo-distributed mode

hbase-env.sh

129 export HBASE_MANAGES_ZK=true

hbase-site.xml

hbase.rootdir

hdfs://192.168.157.11:9000/hbase

hbase.cluster.distributed

true

hbase.zookeeper.quorum

192.168.157.11

dfs.replication

1

regionservers

192.168.157.11

Start HBase: start-hbase.sh

fully distributed model

hbase-site.xml

hbase.rootdir

hdfs://192.168.157.12:9000/hbase

hbase.cluster.distributed

true

hbase.zookeeper.quorum

192.168.157.12

dfs.replication

2

hbase.master.maxclockskew

180000

regionservers

192.168.157.13

192.168.157.14

scp -r hbase-1.3.1/ root@bigdata13:/root/training

scp -r hbase-1.3.1/ root@bigdata14:/root/training

Start HBase: start-hbase.sh

HA of HBase

No additional configuration required, only a single point on one of the slave nodes to start Hmaster

Start HBase: start-hbase.sh

bigdata13:hbase-daemon.sh start master

HBase Web Console web port: 16010

HBase command line operations:

Go to Command Line: hbase shell

View:

View table: list

Query data:

scan is equivalent to select * from table name

Get is equivalent to select * from table name where rowkey=?

Insert data:

put 'table',' row','column family': column name',' value '

put 'students', 'stu1', 'info:name', 'Tom'

Clear the table of data:

truncate 'table name'--------> The essence of truncate is to delete the table before creating it

truncate 'students'

Delete table:

disable 'table name'

drop 'table name'

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