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This document is a step by step procedure for upgrading from Scylla 1.0 to Scylla 1.1, and rollback to 1.0 if required.
This guide covers upgrading Scylla from the following versions: 1.0.x to Scylla version 1.1.y on the following platform:
Ubuntu 14.04
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:
backup the data
check your current release
backup configuration file
download and install new Scylla packages
gracefully restart 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 1.1 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 Scylla, backup is done using the
nodetool snapshot command. For each node in the cluster, run the
following command:
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.
sudo cp -a /etc/scylla/scylla.yaml /etc/scylla/scylla.yaml.backup-1.0
sudo rm -rf /etc/apt/sources.list.d/scylla.list
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 1.0.x version, stop right here!
This guide only covers 1.0.x to 1.1.y upgrades.
To upgrade:
Update the Scylla deb repo to 1.1
Install
sudo apt-get update
sudo apt-get upgrade scylla-server scylla-jmx scylla-tools
Answer ‘y’ to the first two questions and ‘n’ when asked to overwrite
scylla.yaml.
nodetool drain
sudo service scylla-server restart
Check cluster status with nodetool status and make sure all
nodes, including the one you just upgraded, are in UN status.
Check /var/log/upstart/scylla-server.log and /var/log/syslog
to 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.
The following procedure describes a rollback from Scylla release 1.1.x to 1.0.y. Apply this procedure if an upgrade from 1.0 to 1.1 failed before completing on all nodes. Use this procedure only for nodes you upgraded to 1.1
Scylla rollback is a rolling procedure which does not require full cluster shutdown. For each of the nodes rollback to 1.0, you will:
retrieve the old Scylla packages
drain the node
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.
Remove the old repo file.
sudo rm -rf /etc/apt/sources.list.d/scylla.list
Update the Scylla deb repo to 1.0
install
sudo apt-get update
sudo apt-get remove --assume-yes scylla-server scylla-jmx scylla-tools
sudo apt-get install scylla-server scylla-jmx scylla-tools
Answer ‘y’ to the first two questions and ‘n’ when asked to overwrite
scylla.yaml.
nodetool drain
sudo systemctl stop scylla-server.service
sudo rm -rf /etc/scylla/scylla.yaml
sudo cp -a /etc/scylla/scylla.yaml.backup-1.0 /etc/scylla/scylla.yaml
sudo service scylla-server start
Check upgrade instruction above for validation. Once you are sure the node rollback is successful, move to the next node in the cluster.