The supported and recommend route for upgrading 3.x to 5.x is to upgrade
from 3.x to 4.x first, and then from 4.x to 5.x.
Even if you've tested upgrading from 3.x to 5.x directly and it worked
in a test environment, it is still unsupported and not recommended.
That's because you may overlook some hidden issues which can bite you later.
Please follow the tested and proven upgrade route if your data is valuable.
On 03/10/2024 08:30, manish khandelwal wrote:
Hi All
We were evaluating the upgrades of Cassandra clusters managed by us to
Cassandra 5.0. It's clear that Cassandra 4.0 to Cassandra 5.0 is
supported. But I am not sure what is the status with respect to
upgrading Cassandra 3.x to Cassandra 5.0.
Some online resources I found say it is not possible and you should
first jump to Cassandra 4.x. Following resources talk about the
upgrade path
1.
https://planetcassandra.org/news/top-5-questions-we-re-asked-about-apache-cassandra-r-5-0/
2.
https://www.instaclustr.com/blog/top-5-questions-were-asked-about-apache-cassandra-5-0/
Also Cassandra 5.0 announcement says, "Upgrading from 4.x to 5.0 has
been designed and tested as an online upgrade, minimizing downtime for
your applications." Here is the link
<https://cassandra.apache.org/_/blog/Apache-Cassandra-5.0-Announcement.html>.
Meanwhile there is aslack discussion
<https://the-asf.slack.com/archives/CJZLTM05A/p1726630791029329> based
on which my understanding is that there should not be an issue for
upgrading to Cassandra 5.0 from Cassandra 3.x.
I tried upgrading path (3.11.12- -> 5.0.0) using ccm but ccm seems to
not allow me to change the JAVA version on one node and is picking the
JAVA_HOME set on the machine.
It would be of great help if somebody could confirm if Cassandra
upgrade from 3.11.x to 5.0.0 is supported or not?
Regards
Manish
