Upgrading Apache Cassandra cluster

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At thethings.io we use Cassandra as our timeseries database for thing data. Weeks ago we needed to upgrade our cassandra version to a major release version.

This post aims to group all steps that we use for upgrade our Cassandra cluster to a newer version. There are a lot of documentation and sometimes it is a little bit annoying to look at different pages.

This section describes how to upgrade Apache Cassandra with zero downtime if your cluster has a replication factor of at least 3.

Note:

  • Be careful when you run these steps on production environments.
  • For command simplicity I don’t include the user and password. Ex: nodetool drain -u username -pw password

Prerequisites

  • Familiarize yourself with the changes and features in this new release.
  • Remove all dead nodes.
  • Do not run nodetool repair or other tasks.

Please check this link for more information.

Steps for upgrade cassandra version

nodetool drain -h hostname

2. Stop cassandra services.

service cassandra stop
service datastax-agent stop

3. Back up your cassandra configuration files from the old installation to safe place.

4. Update java version.

apt-get update
apt-get install oracle-java8-set-default
java -version

5. Install the new version of Apache Cassandra.

apt-get update
apt-get install cassandra=3.0.9

If you are running Cassandra from a source you should download the latest tar.gz instead of using the package manager.

6. Configure the new product. Review, compare, merge and/or update any modifications you have previously made into the new configuration files for the new version (cassandra.yml, cassandra-env.sh, etc.). Take care with the configuration options and check version restrictions.

7. Start the cassandra services.

service cassandra start
service datastax-agent start

Check the logs for warnings, errors, and exceptions.

tail -f /ttio/var/logs/cassandra/system.log # or path where you set your logs.

8. Run nodetool upgradesstables

nodetool upgradesstables

9. Check the logs for warnings, errors, and exceptions.

tail -f /ttio/var/logs/cassandra/system.log # or path where you set your logs.

10. Check the status of the cluster

nodetool -h hostname status

11. Repeat theses upgrade steps on each node in the cluster.

References


Originally published at Adrià Galín.

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