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Upgrade Guide - Scylla 1.6 to 1.7 for Ubuntu 14.04 or 16.04¶
This document is a step by step procedure for upgrading from Scylla 1.6 to Scylla 1.7, and rollback to 1.6 if required.
Applicable versions¶
This guide covers upgrading Scylla from the following versions: 1.6.x to Scylla version 1.7.y on the following platform:
Ubuntu 14.04 or 16.04
Upgrade Procedure¶
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, you will:
drain node and backup the data
check your current release
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 1.7 features
Not to run administration functions, like repairs, refresh, rebuild or add or remove nodes
Not to apply schema changes
Upgrade steps¶
Drain node and backup the data¶
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.
Backup configuration file¶
sudo cp -a /etc/scylla/scylla.yaml /etc/scylla/scylla.yaml.backup-1.6
Gracefully stop the node¶
sudo service scylla-server stop
Download and install the new release¶
Before upgrading, check what version you are running now using dpkg -s scylla-server. You should use the same version in case you want to rollback the upgrade. If you are not running a 1.6.x version, stop right here! This guide only covers 1.6.x to 1.7.y upgrades.
To upgrade:
Update the Scylla deb repo to 1.7
Upgrade java to 1.8 on Ubuntu 14.04 and Debian 8, which is requested by Scylla 1.7
sudo add-apt-repository -y ppa:openjdk-r/ppa
sudo apt-get update
sudo apt-get install -y openjdk-8-jre-headless
sudo update-java-alternatives -s java-1.8.0-openjdk-amd64
Install
sudo apt-get update
sudo apt-get dist-upgrade scylla
Answer ‘y’ to the first two questions.
Start the node¶
sudo service scylla-server start
Validate¶
Check cluster status with
nodetool statusand 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.Check scylla-server log (check
/var/log/upstart/scylla-server.logfor Ubuntu 14.04, executejournalctl _COMM=scyllafor Ubuntu 16.04 and Debian 8) and/var/log/syslogto validate there are no errors.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.
Rollback Procedure¶
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 1.7.x to 1.6.y. Apply this procedure if an upgrade from 1.6 to 1.7 failed before completing on all nodes. Use this procedure only for nodes you upgraded to 1.7
Scylla rollback is a rolling procedure which does not require full cluster shutdown. For each of the nodes rollback to 1.6, you will:
drain the node and stop Scylla
retrieve the old Scylla packages
restore the configuration file
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.
Rollback steps¶
Gracefully shutdown Scylla¶
nodetool drain
sudo service scylla-server stop
download and install the old release¶
Remove the old repo file.
sudo rm -rf /etc/apt/sources.list.d/scylla.list
Update the Scylla deb repo to 1.6
install
sudo apt-get update
sudo apt-get remove scylla\* -y
sudo apt-get install scylla
Answer ‘y’ to the first two questions.
Restore the configuration file¶
sudo rm -rf /etc/scylla/scylla.yaml
sudo cp -a /etc/scylla/scylla.yaml.backup-1.6 /etc/scylla/scylla.yaml
Start the node¶
sudo service scylla-server start
Validate¶
Check upgrade instruction above for validation. Once you are sure the node rollback is successful, move to the next node in the cluster.