My current version of Cassandra is 2.2.4 and I want to upgrade it to 3.0.10 with out losing any data. How is it possible?
My cluster consist of 3 nodes with replication factor of 2. Will this update affect my cluster architecture?
2 Answers
Steps for upgrade cassandra version
1. Run nodetool drain before shutting down the existing Cassandra service.
nodetool drain -h hostname
2. Stop cassandra services.
service cassandra 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=3.7.0
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.).
7. Start the cassandra services.
service cassandra start
Check the logs for warnings, errors, and exceptions.
tail -f /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 /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.
For more details please go to the link. upgrade Cassandra to the latest version
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