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Apache Cassandra is an open-source NoSQL information base with no single purpose of disappointment, giving direct versatility and high accessibility without bargaining execution. In Cassandra, records are organized likewise as in the social information base with tables, lines, and segments. Apache Cassandra is utilized by various associations including Apple, NetFlix, eBay, and Easou. 

This instructional exercise portrays how to introduce Apache Cassandra on CentOS 7. 

Prerequisites

The client you are signed in as must have sudo advantages to have the option to introduce bundles. 

Installing Apache Cassandra

The prescribed method to introduce Apache Cassandra on CentOS 7 is by introducing the rpm bundle from the official Apache Cassandra storehouse. 

At the hour of composing this article, the most recent adaptation of Apache Cassandra is 3.11 and requires OpenJDK 8 to be introduced on the framework. 

To introduce OpenJDK , on your framework type: 

sudo yum install java-1.8.0-openjdk-devel

Confirm the Java establishment by running the accompanying order which will print the Java rendition : 

java -version

The yield should look something like this: 

openjdk version "1.8.0_201"
OpenJDK Runtime Environment (build 1.8.0_201-b09)
OpenJDK 64-Bit Server VM (build 25.201-b09, mixed mode)

Since Java is introduced, the following stage is to add the Apache Cassandra vault. 

Open your editorial manager of decision and make the accompanying store record: 

sudo nano /etc/yum.repos.d/cassandra.repo

Glue the accompanying substance into the record: 

/etc/yum.repos.d/cassandra.repo

[cassandra]
name=Apache Cassandra
baseurl=https://www.apache.org/dist/cassandra/redhat/311x/
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://www.apache.org/dist/cassandra/KEYS

When the storehouse is empowered, introduce the most recent form of Apache Cassandra by composing: 

sudo yum install cassandra

Start and empower the Cassandra administration: 

sudo systemctl enable cassandra
sudo systemctl start cassandra

Check that Cassandra is running by composing: 

nodetool status

You should see something like this: 

Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address    Load        Tokens       Owns (effective)  Host ID                               Rack
UN  127.0.0.1  103.68 KiB  256          100.0%            129a9437-377d-415b-b6b2-5dc46b73a763  rack1

Now, Apache Cassandra has been introduced on your CentOS worker. 

Configuring Apache Cassandra

Apache Cassandra information is put away in the/var/lib/cassandra index, setup documents are situated in/and so on/cassandra and Java fire up alternatives can be arranged in the/and so forth/default/cassandra record. 

Naturally, Cassandra is designed to tune in on localhost as it were. In the event that the customer associating with the information base is additionally running on a similar host you don't have to change the default setup record. 

To cooperate with Cassandra through CQL (the Cassandra Query Language) you can utilize an order line utility named cqlsh that is sent with the Cassandra bundle. 

cqlsh

Connected to Test Cluster at 127.0.0.1:9042.
[cqlsh 5.0.1 | Cassandra 3.11.4 | CQL spec 3.4.4 | Native protocol v4]
Use HELP for help.
cqlsh>

Renaming Apache Cassandra Cluster

As a matter of course, the Cassandra group is named "Test Cluster". Follow the means underneath in the event that you need to change the bunch name: 

Login to the Cassandra CQL terminal with cqlsh: 

cqlsh

The accompanying order will change the group name to "Linuxize Cluster": 

UPDATE system.local SET cluster_name = 'Linuxize Cluster' WHERE KEY = 'local';

Supplant "Linuxize Cluster" with your ideal name. When done sort exit to leave the comfort. 

Alter the cassandra.yaml arrangement document and enter your new bunch name. 

/etc/cassandra/default.conf/cassandra.yaml

cluster_name: 'Linuxize Cluster'

Run the accompanying order to clear the framework reserve: 

nodetool flush system

At last restart the Cassandra administration: 

sudo systemctl restart cassandra

Conclusion

You have effectively introduced Apache Cassandra on your CentOS 7. You would now be able to visit the official Apache Cassandra Documentation page and figure out how to begin with Cassandra. 

In the event that you hit an issue or have criticism, leave a remark underneath.