How to install Cassandra in CentOS 6.5

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Apache Cassandra
Apache Cassandra is a NoSQL database intended for storing large amounts of data in a decentralized, highly available cluster. NoSQL refers to a database with a data model other than the tabular relations used in relational databases such as MySQL, PostgreSQL, and Microsoft SQL.

Pre-requisite

Stable version of Oracle/Sun Java 7 or higher version installed . Check to see if your server already has Java installed by running the following command:

java -version

1. Add the DataStax Community Repository

Add datastax Cassandra repo to install Apache Cassandra ( DataStax community edition)

vim /etc/yum.repos.d/datastax.repo

Add the following information to the file you’ve created, using i to insert:

[datastax]
name = DataStax Repo for Apache Cassandra
baseurl = http://rpm.datastax.com/community
enabled = 1
gpgcheck = 0

Then exit and save the file with the command :wq

2. Install Apache Cassandra 2

Installing Cassandra is as simple as running just one command:

yum -y install dsc20

Output

You should see something similar to following

[root@ranjeet ~]# yum -y install dsc20
Loaded plugins: fastestmirror
Determining fastest mirrors
epel/metalink                                                                                          | 4.3 kB     00:00
 * base: centosmirror.go4hosting.in
 * epel: ftp.riken.jp
 * extras: centosmirror.go4hosting.in
 * updates: centosmirror.go4hosting.in
base                                                                                                   | 3.7 kB     00:00
datastax                                                                                               | 2.5 kB     00:00
datastax/primary_db                                                                                    | 130 kB     00:01
epel                                                                                                   | 4.3 kB     00:00
epel/primary_db                                                                                        | 5.9 MB     00:04
extras                                                                                                 | 3.4 kB     00:00
extras/primary_db                                                                                      |  37 kB     00:00
mongodb-org-3.2                                                                                        | 2.5 kB     00:00
mongodb-org-3.2/primary_db                                                                             |  45 kB     00:00
updates                                                                                                | 3.4 kB     00:00
updates/primary_db                                                                                     | 2.0 MB     00:01
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package dsc20.noarch 0:2.0.17-1 will be installed
--> Processing Dependency: cassandra20 = 2.0.17 for package: dsc20-2.0.17-1.noarch
--> Running transaction check
---> Package cassandra20.noarch 0:2.0.17-1 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

==============================================================================================================================
 Package                         Arch                       Version                        Repository                    Size
==============================================================================================================================
Installing:
 dsc20                           noarch                     2.0.17-1                       datastax                     1.9 k
Installing for dependencies:
 cassandra20                     noarch                     2.0.17-1                       datastax                      17 M

Transaction Summary
==============================================================================================================================
Install       2 Package(s)

Total download size: 17 M
Installed size: 20 M
Downloading Packages:
(1/2): cassandra20-2.0.17-1.noarch.rpm                                                                 |  17 MB     00:11
(2/2): dsc20-2.0.17-1.noarch.rpm                                                                       | 1.9 kB     00:00
------------------------------------------------------------------------------------------------------------------------------
Total                                                                                         1.4 MB/s |  17 MB     00:12
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
  Installing : cassandra20-2.0.17-1.noarch                                                                                1/2
  Installing : dsc20-2.0.17-1.noarch                                                                                      2/2
  Verifying  : cassandra20-2.0.17-1.noarch                                                                                1/2
  Verifying  : dsc20-2.0.17-1.noarch                                                                                      2/2

Installed:
  dsc20.noarch 0:2.0.17-1

Dependency Installed:
  cassandra20.noarch 0:2.0.17-1

Complete!

3. Get Cassandra Running

Start-Up Cassandra

systemctl start cassandra
or 
service cassandra start

Check Cassandra Service Status

systemctl status cassandra
or 
service cassandra status

check CQL

cqlsh

The cqlsh interface should look similar to:

Connected to Test Cluster at localhost:9160.
[cqlsh 4.1.1 | Cassandra 2.0.10 | CQL spec 3.1.1 | Thrift protocol 19.39.0]
Use HELP for help.
cqlsh>

Check Cassandra Node Status

nodetool status
[root@ranjeet ~]# service cassandra status
cassandra is stopped
[root@ranjeet ~]# service cassandra start
Starting Cassandra: OK
[root@ranjeet ~]# nodetool status
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address    Load       Tokens  Owns (effective)  Host ID                               Rack
UN  127.0.0.1  46.18 KB   256     100.0%            4cfd1047-75c9-403f-ac15-8f00b4636fd1  rack1
[root@ranjeet ~]# 

If you get an error such as: ‘Failed to connect to ’127.0.0.1:7199′: Connection refused’

vim /etc/cassandra/default.conf/cassandra-env.sh

change following line in /etc/cassandra/default.conf/cassandra-env.sh , to your / ip from where you are connecting, if any issue in starting of cassandra service and connection.

# add this if you’re having trouble connecting:
# JVM_OPTS=”$JVM_OPTS -Djava.rmi.server.hostname=

Restart Cassandra

service cassandra restart

Shutdown Cassandra

service cassandra stop

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