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If you use Mac OS X as your platform for development work, then you may be interested to know how easy it is to use Apache Cassandra on the Mac. The following shows you how to download and setup Cassandra, its utilities, and also use DataStax OpsCenter, which is a browser-based, visual management and monitoring tool for Cassandra.

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DataStax makes available the DataStax Community Edition, which contains the latest community version of Apache Cassandra, along with the Cassandra Query Language (CQL) utility, and a free edition of DataStax OpsCenter. To get Datastax Community Edition, go to Planet Cassandra and download both Cassandra and OpsCenter, and select the tar downloads of both the DataStax Community Server and OpsCenter. You can also use the curl command on Mac to directly download the files to your machine. For example, to download the DataStax Community Server, you could enter the following at terminal prompt: curl -OL http://downloads.datastax.com/community/dsc.tar.gz

Install Cassandra

Once your download of Cassandra finishes, move the file to whatever directory you’d like to use for testing Cassandra. Then uncompress the file (whose name will change depending on the version you’re downloading):

Then switch to the new Cassandra bin directory and start up Cassandra:

Now that you have Cassandra running, the next thing to do is connect to the server and begin creating database objects. This is done with the Cassandra Query Language (CQL) utility. CQL is a very SQL-like language that lets you create objects as you’re likely used to doing in the RDBMS world. The CQL utility (cqlsh) is in the same bin directory as the cassandra executable:

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[cqlsh 2.3.0 Cassandra 1.2.2 CQL spec 3.0.0 Thrift protocol 19.35.0]

Cassandra has the concept of a keyspace, which is similar to a database in a RDBMS. A keyspace holds data objects and is the level where you specify options for a data partitioning and replication strategy. For this brief introduction, we’ll just create a basic keyspace to hold some example data objects we’ll create:

Now that you have a keyspace created, it’s time to create a data object to store data. Because Cassandra is based on Google Bigtable, you’ll use column families /tables to store data. Tables in Cassandra are similar to RDBMS tables, but are much more flexible and dynamic. Cassandra tables have rows like RDBMS tables, but they are a sparse column type of object, meaning that rows in a column family can have different columns depending on the data you want to store for a particular row. Let’s create a base table to hold employee data:

The column family is named emp and contains four columns, including the employee ID, which acts as the primary key of the table. Note that a column family must have a primary key that’s used for initial query activity. Let’s now go ahead and insert data into our new column family using the CQL INSERT command:

Notice how Cassandra’s CQL is literally identical to the RDBMS INSERT command. Other DML statements are as well:

Querying data uses the familiar SELECT statement:

However, look what happens when you try to use a WHERE predicate and reference a non-primary key column:

Mac

Cassandra Software

In Cassandra, if you want to query columns other than the primary key, you need to create a secondary index on them:

Installing and using DataStax OpsCenter

Installing DataStax OpsCenter on Mac involves working through the following steps in a terminal window:

  1. Untar the package (tar –xzf) in the directory you want to use for OpsCenter.
  2. Change directories to the OpsCenter home bin directory, and run the ./setup.py script.
  3. You can now start the primary OpsCenter process in the background by entering the command ./opscenter & from the bin directory.
  4. Now you need to get the agent configured to monitor the Cassandra instance you likely already have running on your Mac. Change to the agent/bin directory and run the setup script passing the localhost IP (usually 127.0.0.1) twice: ./setup 127.0.0.1 127.0.0.1.
  5. Start the agent from the agent/bin directory: ./datastax-agent.
  6. Open either a Firefox, Chrome, or Safari web browser and enter the following in the address bar: http://127.0.0.1:8888/opscenter/index.html.

Conclusion

That’s it – you’ve now got Cassandra and DataStax OpsCenter installed and running on your Mac. For other software such as various application drivers and client libraries, visit the DataStax downloads page.

Downloading Cassandra

Mac

Latest Beta Version

Download the latest Apache Cassandra 4.0 beta release: 4.0-beta3 (pgp, sha256 and sha512), released on 2020-11-04.

Latest Stable Version

Download the latest Apache Cassandra 3.11 release: 3.11.9 (pgp, sha256 and sha512), released on 2020-11-04.

Older Supported Releases

The following older Cassandra releases are still supported:

  • Apache Cassandra 3.0 is supported until 6 months after 4.0 release (date TBD). The latest release is 3.0.23 (pgp, sha256 and sha512), released on 2020-11-04.
  • Apache Cassandra 2.2 is supported until 4.0 release (date TBD). The latest release is 2.2.19 (pgp, sha256 and sha512), released on 2020-11-04.
  • Apache Cassandra 2.1 is supported until 4.0 release (date TBD) with critical fixes only. The latest release is2.1.22 (pgp, sha256 and sha512), released on 2020-08-31.

Older (unsupported) versions of Cassandra are archived here.

Datastax Cassandra Download For Mac

Installation from Debian packages

Version
  • For the <release series> specify the major version number, without dot, and with an appended x.
  • The latest <release series> is 311x.
  • For older releases, the <release series> can be one of 30x, 22x, or 21x.

  • Add the Apache repository of Cassandra to /etc/apt/sources.list.d/cassandra.sources.list, for example for the latest 3.11 version:
  • Add the Apache Cassandra repository keys:
  • Update the repositories:
  • If you encounter this error:

Then add the public key A278B781FE4B2BDA as follows:

and repeat sudo apt-get update. The actual key may be different, you get it from the error message itself. For afull list of Apache contributors public keys, you can refer to https://downloads.apache.org/cassandra/KEYS.

  • Install Cassandra:
  • You can start Cassandra with sudo service cassandra start and stop it with sudo service cassandra stop.However, normally the service will start automatically. For this reason be sure to stop it if you need to make anyconfiguration changes.
  • Verify that Cassandra is running by invoking nodetool status from the command line.
  • The default location of configuration files is /etc/cassandra.
  • The default location of log and data directories is /var/log/cassandra/ and /var/lib/cassandra.
  • Start-up options (heap size, etc) can be configured in /etc/default/cassandra.

Installation from RPM packages

  • For the <release series> specify the major version number, without dot, and with an appended x.
  • The latest <release series> is 311x.
  • For older releases, the <release series> can be one of 30x, 22x, or 21x.
  • (Not all versions of Apache Cassandra are available, since building RPMs is a recent addition to the project.)

  • Add the Apache repository of Cassandra to /etc/yum.repos.d/cassandra.repo, for example for the latest 3.11 version:
Software
  • Install Cassandra, accepting the gpg key import prompts:

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Start Cassandra (will not start automatically):

Systemd based distributions may require to run systemctl daemon-reload once to make Cassandra available as a systemd service. This should happen automatically by running the command above.

Make Cassandra start automatically after reboot:

Please note that official RPMs for Apache Cassandra only have been available recently and are not tested thoroughly on all platforms yet. We appreciate your feedback and support and ask you to post details on any issues in the corresponding Jira ticket.

Source

Development is done in the Apache Git repository. To check out a copy: