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Mac OS X has a copy of Python preinstalled, but this makes sure you get the newest version. Brew install python Install cql. To use cqlsh, the Cassandra query language shell, you need to install cql: pip install cql pip install cassandra-driver Install Cassandra. This installs Apache Cassandra: brew install cassandra Starting Cassandra. A bootable installer doesn't download macOS from the Internet, but it does require the Internet to get information specific to your Mac model, such as firmware updates. If you need to connect to a Wi-Fi network, use the Wi-Fi menu in the menu bar. To scale out a Cassandra cluster in DC/OS 1.10 you must use the dcos cassandra subcommand update start with a configuration file, dcos cassandra update start -options=config.json. In the configuration file, under the nodes section, increase the count.

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What is Cassandra

Cassandra is a high-availability/high performance/no single point of failure data storage system that can look a lot like SQL - or NoSQL. DataStax, supplies an enterprise ready version of Cassandra called DataStax Enterprise.

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Planet Cassandra calls it an 'always on' architecture and has a good description: of What is Cassandra. http://www.planetcassandra.org/what-is-apache-cassandra/

Trying Out Cassandra

Planet Cassandra also provides a Try Cassandra page (http://www.planetcassandra.org/try-cassandra/) that enables developers to try out Cassandra before even installing it. On this page, the user can check out Casandra's SQL-like capabilities': set up a keyspace, create a table, insert some rows, update rows, and do selects on the table.

Download and Installation Options

The Apache version and DataStax Community versions are approximately the same thing. DataStax provides instructions for the community edition and some getting started pages for Windows: There is also a DataStax Enterprise version described here.

Cassandra relies on Java 8 to run, and Python 2.7 to be able to use CQL. DataStax Enterprise runs on either Mac or Linux - not Windows. It comes with tools and features that readily enable set up and usage of Cassandra in a production environment. DataStax Community version runs on all three: Windows, Mac, or Linux. You can download:

The Apache version here: http://cassandra.apache.org/download/
The DataStax Community here: http://planetcassandra.org/cassandra/
The DataStax Enterprise version (time limited) here: https://academy.datastax.com/downloads

To install,

For Linux, the untar the distribution.

For Windows there is a Windows installer. See: http://docs.datastax.com/en/cassandra_win/3.x/cassandra/install/installWin.html and Getting started with Apache Cassandra on Windows the easy way.

For Mac: http://www.datastax.com/2012/01/working-with-apache-cassandra-on-mac-os-x

Startup

The bin directory contains a file called cassandra. From the top-level directory for the distribution, run:

$ bin/cassandra

Using Cassandra

Also from the top-level directory:

$ python bin/cqlsh.py
Connected to Test Cluster at 127.0.0.1:9042.
[cqlsh 5.0.1 | Cassandra 3.3.0 | CQL spec 3.4.0 | Native protocol v4]
Use HELP for help.

cqlsh> create keyspace hr with replication={'class':'SimpleStrategy', 'replication_factor':1};

cqlsh> use hr;

cqlsh:hr> create table test (id int primary key, first varchar, last varchar, dept varchar);

cqlsh:hr> insert into test(id,first, last, dept) values (1,'joe','smudley','HR');

cqlsh:hr> select * from test;