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This document is a step by step procedure for upgrading from Scylla 3.2 to Scylla 3.3, and rollback to 3.2 if required.
This guide covers upgrading Scylla from the following versions: 3.2.x or later to Scylla version 3.3.y, on the following platforms:
Red Hat Enterprise Linux, version 7 and later
CentOS, version 7 and later
No longer provide packages for Fedora
Note
Execute the following commands one node at the time, moving to the next node only after the upgrade procedure completed successfully.
Warning
If you are using CDC and upgrading Scylla 4.3 to 4.4, please review the API updates in querying CDC streams and CDC stream generations. In particular, you should update applications that use CDC according to CDC Upgrade notes before upgrading the cluster to 4.4.
If you are using CDC and upgrading from pre 4.3 version to 4.3, note the upgrading from experimental CDC.
A Scylla upgrade is a rolling procedure which does not require full cluster shutdown. For each of the nodes in the cluster, serially (i.e. one at a time), you will:
Check cluster schema
Drain node and backup the data
Backup configuration file
Stop Scylla
Download and install new Scylla packages
Start Scylla
Validate that the upgrade was successful
Apply the following procedure serially on each node. Do not move to the next node before validating the node is up and running with the new version.
During the rolling upgrade it is highly recommended:
Not to use new 3.3 features
Not to run administration functions, like repairs, refresh, rebuild or add or remove nodes. See sctool for suspending Scylla Manager (only available Scylla Enterprise) scheduled or running repairs.
Not to apply schema changes
Note
Before upgrading, make sure to use Scylla Monitoring 3.1 or newer, for the Dashboards.
Make sure that all nodes have the schema synched prior to upgrade, we won’t survive an upgrade that has schema disagreement between nodes.
nodetool describecluster
Before any major procedure, like an upgrade, it is recommended to backup all the data to an external device. In Scylla, 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 complete (all nodes), the snapshot should be removed by nodetool clearsnapshot -t <snapshot>, or you risk running out of space.
sudo cp -a /etc/scylla/scylla.yaml /etc/scylla/scylla.yaml.backup-src
sudo systemctl stop scylla-server
Before upgrading, check what version you are running now using rpm -qa | grep scylla-server. You should use the same version in case you want to rollback the upgrade. If you are not running a 3.2.x version, stop right here! This guide only covers 3.2.x to 3.3.y upgrades.
To upgrade:
Update the Scylla rpm repo to 3.3
install
sudo yum update scylla\* -y
Note
Alternator users upgrading from Scylla 4.0 to 4.1, need to set default isolation level
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 scylla 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 Scylla release 3.3.x to 3.2.y. Apply this procedure if an upgrade from 3.2 to 3.3 failed before completing on all nodes. Use this procedure only for nodes you upgraded to 3.3
Scylla rollback is a rolling procedure which does not require full cluster shutdown. For each of the nodes rollback to 3.2, you will:
Drain the node and stop Scylla
Retrieve the old Scylla packages
Restore the configuration file
Reload systemd configuration
Restart Scylla
Validate the rollback success
Apply the following procedure serially on each node. Do not move to the next node before validating the node is up and running with the new version.
nodetool drain
sudo systemctl stop scylla-server
Remove the old repo file.
sudo rm -rf /etc/yum.repos.d/scylla.repo
Update the Scylla rpm repo to 3.2
Install
sudo yum clean all sudo rm -rf /var/cache/yum sudo yum remove scylla\*tools-core sudo yum downgrade scylla\* -y sudo yum install scylla
sudo rm -rf /etc/scylla/scylla.yaml
sudo cp -a /etc/scylla/scylla.yaml.backup-src| /etc/scylla/scylla.yaml
Restore all tables of system and system_schema from previous snapshot, 3.3 uses a different set of system tables. Reference doc: Restore from a Backup and Incremental Backup
cd /var/lib/scylla/data/keyspace_name/table_name-UUID/snapshots/<snapshot_name>/
sudo cp -r * /var/lib/scylla/data/keyspace_name/table_name-UUID/
sudo chown -R scylla:scylla /var/lib/scylla/data/keyspace_name/table_name-UUID/
Require to reload the unit file if the systemd unit file is changed.
sudo systemctl daemon-reload
sudo systemctl start scylla-server
Check upgrade instruction above for validation. Once you are sure the node rollback is successful, move to the next node in the cluster.