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This document is a step-by-step procedure for upgrading from ScyllaDB Enterprise 2022.x.y to 2022.x.z.
This guide covers upgrading ScyllaDB Enterprise from version 2022.x.y to 2022.x.z, on the following platforms:
Red Hat Enterprise Linux 7 and later
CentOS 7 and later
Packages for Fedora are no longer provided.
A ScyllaDB upgrade is a rolling procedure which does not require a full cluster shutdown. For each of the nodes in the cluster, you will:
Drain the node and backup the data
Check your current release
Backup the configuration file
Stop ScyllaDB
Download and install the new ScyllaDB packages
Start ScyllaDB
Validate that the upgrade was successful
Apply the following procedure serially on each node. Do not move to the next node before validating that the node that you upgraded is up and running the new version.
During the rolling upgrade, it is highly recommended:
Not to use new 2022.x.z features.
Not to run administration functions, like repairs, refresh, rebuild or add or remove nodes.
Not to apply schema changes.
Before any major procedure, like an upgrade, it is recommended to backup all the data to an external device. In ScyllaDB, backup is done using the nodetool snapshot command. For each node in the cluster, run the following command:
nodetool drain
nodetool snapshot
Take note of the directory name that nodetool gives you, and copy all the directories having this name under /var/lib/scylla to a backup device.
When the upgrade is completed on all nodes, the snapshot should be removed with the nodetool clearsnapshot -t <snapshot> command, or you risk running out of space.
sudo cp -a /etc/scylla/scylla.yaml /etc/scylla/scylla.yaml.backup-2021.x.z
sudo systemctl stop scylla-server
Before upgrading, check what version you are running now using rpm -qa | grep scylla-enterprise-server. You should use the same version in case you want to rollback the upgrade. If you are not running a 2022.x.y version, stop right here! This guide only covers 2022.x.y to 2022.x.z upgrades.
To upgrade:
Update the ScyllaDB Enterprise RPM repo to 2022.x.
Install:
sudo yum clean all sudo yum update scylla\* -y
sudo systemctl start scylla-server
Check cluster status with nodetool status and make sure all nodes, including the one you just upgraded, are in UN status.
Use curl -X GET "http://localhost:10000/storage_service/scylla_release_version" to check the ScyllaDB version.
Use journalctl _COMM=scylla to check there are no new errors in the log.
Check again after 2 minutes to validate no new issues are introduced.
Once you are sure the node upgrade is successful, move to the next node in the cluster.
Note
Execute the following commands one node at the time, moving to the next node only after the rollback procedure completed successfully.
The following procedure describes a rollback from ScyllaDB Enterprise release 2022.x.z to 2022.x.y. Apply this procedure if an upgrade from 2022.x.y to 2022.x.z failed before completing on all nodes. Use this procedure only for nodes you upgraded to 2022.x.z.
ScyllaDB rollback is a rolling procedure which does not require a full cluster shutdown. For each of the nodes rollback to 2022.x.y, you will:
Drain the node and stop ScyllaDB
Downgrade to the previous release
Restore the configuration file
Restart ScyllaDB
Validate the rollback success
Apply the following procedure serially on each node. Do not move to the next node before validating that the node is up and running the new version.
nodetool drain
sudo systemctl stop scylla-server
Install:
sudo yum downgrade scylla\*-2022.x.y-\* -y
sudo rm -rf /etc/scylla/scylla.yaml
sudo cp -a /etc/scylla/scylla.yaml.backup-2022.x.z /etc/scylla/scylla.yaml
sudo systemctl start scylla-server
Check the upgrade instruction above for validation. Once you are sure the node rollback is successful, move to the next node in the cluster.