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Preparing to upgrade Cassandra

To prepare for Cassandra upgrade

1. Ensure that all Cassandra nodes are ready. Run the following command and verify that all nodes are Up and Normal:
   

   Code Block
   language bash theme DJango linenumbers true
   nodetool status

2. Leave the Cassandra service running but stop all Teamwork Cloud services.
3. Back up your current database before upgrading.
4. Upgrade all Cassandra data tables to current version by running the following command:
   

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   nodetool upgradesstables

   Note
   This process can take a long time for large databases. To run the upgrade process in the background, you can use the Linux nohup command: Code Block language bash theme DJango linenumbers true nohup nodetool upgradesstables & Make sure this process is completed before proceeding!

Upgrading Cassandra

Teamwork Cloud no longer supports Apache Cassandra 3.x, therefore before upgrading Teamwork Cloud, you need to upgrade Casandra to version 4.1.

To upgrade Cassandra

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1. IMPORTANT! Flush memtables to the disk by executing the following command:

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   nodetool drain

2. Shut down Stop the Cassandra nodeservice.

3. Backup the Cassandra configuration file at:   /etc/cassandra/default.conf/cassandra.yaml

4. Make a note of the existing cluster name and token count with the following command:

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   grep -E 'num_tokens:|cluster_name:' cassandra.yaml

5. Uninstall/remove Cassandra 3.x (example with yum package manager)

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   sudo yum remove -y cassandra

6. Install Cassandra 4.x. new version of Cassandra (for installation instructions, see see Installing Cassandra on Linux or  or Installing Cassandra on Windows.

   Configure the 4.x node to point to the appropriate data files in the /etc/cassandra/default.conf/cassandra.yaml settings as shown in the example below.
   

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   language	bash
   title	Example

   data_file_directories: - /data/data commitlog_directory: /logs/commitlog hints_directory: /data/hints saved_caches_directory: /data/saved_caches).

7. Check the cluster name and token count in cassandra.yaml. If If needed, replace the default values with the values set in 3the previous version. x. The example below shows the default values for a Cassandra 4.x installation. 

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   language bash title Example
   cluster_name: 'Test Cluster' num_tokens: 16

   Note
   title Cassandra 4 Configuration
   The cluster name and token count must match those values set in Cassandra 3.xthe previous version of Cassandra.

9. Start the Cassandra 4.x node.Cassandra service.

10. Check if the service is running smoothly:

    • Check the log

    files

    • file for startup errors.

    After the upgrade is complete, perform the required post-installation configuration changes. For more information, see Post-installation steps on Linux or Post-installation steps on Windows.

    • Verify that all nodes have a status of Up and Normal with this command:

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      nodetool status

Additional resources

For more information about upgrading Apache Cassandra, see https://www.datastax.com/learn/whats-new-for-cassandra-4/migrating-cassandra-4x.