First and foremost, read NEWS.txt from your current version to the
version you wish to upgrade to. There are too may details that you many
need to be aware of. For instance, in the 2.0.0 Upgrading notes:
https://github.com/apache/cassandra/blob/cassandra-3.11/NEWS.txt#L1169-L1178
I assume you meant 1.2.5, so you're first step is to upgrade to at least
1.2.9 (I would suggest using latest 1.2.x, which is 1.2.19). Then you
can to to 2.0.x and up.
Practicing on a scratch cluster is valuable experience. Reading the
upgrade notes in NEWS.txt is a must.
--
Kind regards,
Michael
On 6/17/19 3:34 AM, Anurag Sharma wrote:
Thanks Alex,
I came across some interesting and efficient ways of upgrading from 1.x
to 3.x as described in the blog here
<https://medium.com/@roeezilkha/database-migration-at-scale-ae85c14c3621> and
others. Was curious if someone has open-sourced their custom utility. :D
Regards
Anurag
On Mon, Jun 17, 2019 at 1:27 PM Oleksandr Shulgin
<oleksandr.shul...@zalando.de <mailto:oleksandr.shul...@zalando.de>> wrote:
On Mon, Jun 17, 2019 at 9:30 AM Anurag Sharma
<anurag.rp.sha...@gmail.com <mailto:anurag.rp.sha...@gmail.com>> wrote:
We are upgrading Cassandra from 1.25 to 3.X. Just curious if
there is any recommended open source utility for the same.
Hi,
The "recommended open source utility" is the Apache Cassandra
itself. ;-)
Given the huge difference between the major versions, though, you
will need a decent amount of planning and preparation to
successfully complete such a migration. Most likely you will want
to do it in small steps, first upgrading to the latest minor version
in the 1.x series, then making a jump to 2.x, then to 3.0, and only
then to 3.x if you really mean to. On each upgrade step, be sure to
examine the release notes carefully to understand if there is any
impact for your cluster and/or client applications. Do have a test
system with preferably identical setup and configuration and execute
the upgrade steps there first to verify your expectations.
Good luck!
--
Alex
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