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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:
   

   Code Block
   language bash theme DJango linenumbers true
   nodetool upgradesstables

   Info
   This process can take a long time for large databases. Use the jobs option to use more threads for the operation (0 for maximum threads available, default is 2). Also, use the nohup command to run the upgrade process in the background. Code Block language bash theme DJango linenumbers true nohup nodetool upgradesstables --jobs 0 & Make sure this process is completed before proceeding!

Upgrading Cassandra

To upgrade Cassandra

---

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

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   nodetool drain

1. Stop the Cassandra service.

2. 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

3. Uninstall/remove Cassandra

1. (example with yum package manager)

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   sudo yum remove -y cassandra

1. Info
   Cassandra configuration files are saved with .rpmsave extension after uninstallation (default path: /etc/cassandra/default.conf

1. ). Archive these files for future reference.

2. Install new version of Cassandra (for installation instructions, see Installing Cassandra on Linux).

3. Check the cluster name and token count

1. in cassandra.yaml. If needed, replace the default values with the values set in

1. the previous version. The example below shows the default values for a Cassandra

1. installation.

1. Code Block
   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 the previous version of Cassandra

1. .

2. Start the Cassandra

1. service.

2. Check if the service is running smoothly:

   • Check the log

1. • file for startup errors.

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

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     language bash theme DJango linenumbers true
     nodetool status

2. Upgrade all Cassandra data tables to current version by running the following command:
   

   Code Block
   language bash theme DJango linenumbers true
   nodetool upgradesstables

   Info
   This process can take a long time for large databases. Use the jobs option to use more threads for the operation (0 for maximum threads available, default is 2). Also, use the nohup command to run the upgrade process in the background. Code Block language bash theme DJango linenumbers true nohup nodetool upgradesstables --jobs 0 & Make sure this process is completed before proceeding!

Additional resources

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