HBase Installation

Installing HBase

We can install HBase in any of the three modes: Standalone mode, Pseudo Distributed mode, and Fully Distributed mode.

Installing HBase in Standalone Mode

Download the latest stable version of HBase form http://www.interior-dsgn.com/apache/hbase/stable/ using “wget” command, and extract it using the tar “zxvf” command. See the following command.

$cd usr/local/

$wget http://www.interior-dsgn.com/apache/hbase/stable/hbase-0.98.8-

hadoop2-bin.tar.gz

$tar -zxvf hbase-0.98.8-hadoop2-bin.tar.gz

Shift to super user mode and move the HBase folder to /usr/local as shown below.

$su

$password: enter your password here

mv hbase-0.99.1/* Hbase/

Configuring HBase in Standalone Mode

Before proceeding with HBase, you have to edit the following files and configure HBase.

hbase-env.sh

Set the java Home for HBase and open hbase-env.sh file from the conf folder. Edit JAVA_HOME environment variable and change the existing path to your current JAVA_HOME variable as shown below.

cd /usr/local/Hbase/conf

gedit hbase-env.sh

This will open the env.sh file of HBase. Now replace the existing JAVA_HOME value with your current value as shown below.

export JAVA_HOME=/usr/lib/jvm/java-1.7.0

hbase-site.xml

This is the main configuration file of HBase. Set the data directory to an appropriate location by opening the HBase home folder in /usr/local/HBase. Inside the conf folder, you will find several files, open the hbase-site.xml file as shown below.

#cd /usr/local/HBase/

#cd conf

# gedit hbase-site.xml

Inside the hbase-site.xml file, you will find the <configuration> and </configuration> tags. Within them, set the HBase directory under the property key with the name “hbase.rootdir” as shown below.

<configuration>

   //Here you have to set the path where you want HBase to store its files.

   <property>

      <name>hbase.rootdir</name>

      <value>file:/home/hadoop/HBase/HFiles</value>

   </property>

           

   //Here you have to set the path where you want HBase to store its built in zookeeper  files.

   <property>

      <name>hbase.zookeeper.property.dataDir</name>

      <value>/home/hadoop/zookeeper</value>

   </property>

</configuration>

With this, the HBase installation and configuration part is successfully complete. We can start HBase by using start-hbase.sh script provided in the bin folder of HBase. For that, open HBase Home Folder and run HBase start script as shown below.

$cd /usr/local/HBase/bin

$./start-hbase.sh

If everything goes well, when you try to run HBase start script, it will prompt you a message saying that HBase has started.

starting master, logging to /usr/local/HBase/bin/../logs/hbase-tpmaster-localhost.localdomain.out

Installing HBase in Pseudo-Distributed Mode

Let us now check how HBase is installed in pseudo-distributed mode.

CONFIGURING HBASE

Before proceeding with HBase, configure Hadoop and HDFS on your local system or on a remote system and make sure they are running. Stop HBase if it is running.

hbase-site.xml

Edit hbase-site.xml file to add the following properties.

<property>

   <name>hbase.cluster.distributed</name>

   <value>true</value>

</property>

It will mention in which mode HBase should be run. In the same file from the local file system, change the hbase.rootdir, your HDFS instance address, using the hdfs://// URI syntax. We are running HDFS on the localhost at port 8030.

<property>

   <name>hbase.rootdir</name>

   <value>hdfs://localhost:8030/hbase</value>

</property>

Starting HBase

After configuration is over, browse to HBase home folder and start HBase using the following command.

$cd /usr/local/HBase

$bin/start-hbase.sh

Note: Before starting HBase, make sure Hadoop is running.

Checking the HBase Directory in HDFS

HBase creates its directory in HDFS. To see the created directory, browse to Hadoop bin and type the following command.

$ ./bin/hadoop fs -ls /hbase

If everything goes well, it will give you the following output.

Found 7 items

drwxr-xr-x - hbase users 0 2014-06-25 18:58 /hbase/.tmp

drwxr-xr-x - hbase users 0 2014-06-25 21:49 /hbase/WALs

drwxr-xr-x - hbase users 0 2014-06-25 18:48 /hbase/corrupt

drwxr-xr-x - hbase users 0 2014-06-25 18:58 /hbase/data

-rw-r--r-- 3 hbase users 42 2014-06-25 18:41 /hbase/hbase.id

-rw-r--r-- 3 hbase users 7 2014-06-25 18:41 /hbase/hbase.version

drwxr-xr-x - hbase users 0 2014-06-25 21:49 /hbase/oldWALs

Starting and Stopping a Master

Using the “local-master-backup.sh” you can start up to 10 servers. Open the home folder of HBase, master and execute the following command to start it.

$ ./bin/local-master-backup.sh 2 4

To kill a backup master, you need its process id, which will be stored in a file named “/tmp/hbase-USER-X-master.pid.” you can kill the backup master using the following command.

$ cat /tmp/hbase-user-1-master.pid |xargs kill -9

Starting and Stopping RegionServers

You can run multiple region servers from a single system using the following command.

$ .bin/local-regionservers.sh start 2 3

To stop a region server, use the following command.

$ .bin/local-regionservers.sh stop 3

Starting HbaseShell

After Installing HBase successfully, you can start HBase Shell. Below given are the sequence of steps that are to be followed to start the HBase shell. Open the terminal, and login as super user.

Start Hadoop File System

Browse through Hadoop home sbin folder and start Hadoop file system as shown below.

$cd $HADOOP_HOME/sbin

$start-all.sh

Start HBase

Browse through the HBase root directory bin folder and start HBase.

$cd /usr/local/HBase

$./bin/start-hbase.sh

Start HBase Master Server

This will be the same directory. Start it as shown below.

$./bin/local-master-backup.sh start 2 (number signifies specific

server.)

Start Region

Start the region server as shown below.

$./bin/./local-regionservers.sh start 3

Start HBase Shell

You can start HBase shell using the following command.

$cd bin

$./hbase shell

This will give you the HBase Shell Prompt as shown below.

2016-12-09 14:24:27,526 INFO [main] Configuration.deprecation:

hadoop.native.lib is deprecated. Instead, use io.native.lib.available

HBase Shell; enter 'help<RETURN>' for list of supported commands.

Type "exit<RETURN>" to leave the HBase Shell

Version 0.98.8-hadoop2, r6cfc8d064754251365e070a10a82eb169956d5fe, Fri

Nov 14 18:26:29 PST 2016

hbase(main):001:0>