HBase Client Example

hbase client example will show how to use hbase with java api

include ddl and dml

ddl : list tables,create table ,alter table,read region location,compact,split

dml: put,batch put,delete,increment,scan,get

Requirements:

• Windows or Linux or Mac OS X

• Java 8

• Maven 3.6.3+

Building HBase Client Example

git clone https://github.com/utf7/hbase-client-example.git
cd hbase-client-example
mvn clean package

Running the Test

import config

hbase-site.xml is the config file for hbase client to use

a simple hbase-site.xml client config like

<configuration>
    <property>
        <name>hbase.zookeeper.quorum</name>
        <value>zk1,zk2,zk3</value>
    </property>
    <property>
        <name>hbase.zookeeper.property.clientPort</name>
        <value>2181</value>
    </property>
    <property>
        <name>zookeeper.znode.parent</name>
        <value>/hbase</value>
    </property>
</configuration>
  

Run fat-jar

if your hbase-site.xml in the folder /home/conf/

java -cp /home/conf/:hbase-client-example-1.0.jar com.github.utf7.hbase.client.example.HBaseDemo 100 

100 means write 100 rows data to hbase

Region Tool

merge region

thin jar mode

	 java -cp "original-hbase-client-example.jar:/usr/local/hbase/lib/*:/usr/local/hbase/conf/" com.github.utf7.hbase.tool.RegionTool "default:test_to_merge_tb" 1024

RegionName

Bytes.toString(regionInfo.getRegionName()) : hb_test,,1647862081929.adfbdd6411c6015c2b93ec0189f7ec8d.
getRegionNameAsString : hb_test,,1647862081929.adfbdd6411c6015c2b93ec0189f7ec8d.
Bytes.toString(regionInfo.getEncodedNameAsBytes()):   adfbdd6411c6015c2b93ec0189f7ec8d
getEncodedName : adfbdd6411c6015c2b93ec0189f7ec8d
getRegionId : 1647862081929

HBase Shell Create Table example

create 'test', {NAME => 'f1', VERSIONS => '1', COMPRESSION => 'GZ', DATA_BLOCK_ENCODING => 'FAST_DIFF',  CONFIGURATION => {'hbase.hstore.compaction.max' => '15','hbase.hstore.compaction.min' => '7','hbase.hregion.max.filesize' => '21474836480', 'hbase.hregion.majorcompaction' => '0'}},{NUMREGIONS => 30,SPLITALGO => 'DecimalStringSplit'}