cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Alain RODRIGUEZ <arodr...@gmail.com>
Subject Re: (C)* stable version after 3.5
Date Wed, 13 Jul 2016 21:28:18 GMT
Hi Anuj

From
https://docs.datastax.com/en/latest-upgrade/upgrade/cassandra/upgrdBestPractCassandra.html
:


>    - Employ a continual upgrade strategy for each year. Upgrades are
>    impacted by the version you are upgrading from and the version you are
>    upgrading to. The greater the gap between the current version and the
>    target version, the more complex the upgrade.
>
>
And I could not find it but historically I am quite sure it was explicitly
recommended not to skip a major update (for a rolling upgrade), even if I
could not find it. Anyway it is clear that the bigger the gap is, the more
careful we need to be.

On the other hand, I see 2.2 as a 2.1 + some feature but no real breaking
changes (as 3.0 was already on the pipe) and doing a 2.2 was decided
because 3.0 was taking a long time to be released and some feature were
ready for a while.

I might be wrong on some stuff above, but one can only speak with his
knowledge and from his point of view. So I ended up saying:

Also I am not sure if the 2.2 major version is something you can skip while
> upgrading through a rolling restart. I believe you can, but it is not what
> is recommended.
>

Note that "I am not sure", "I believe you can"... So it was more a thought,
something to explore for Varun :-).

And I actually encouraged him to move forward. Now that Tyler Hobbs
confirmed it works, you can put a lot more trust on the fact that this
upgrade will work :-). I would still encourage people to test it (for
client compatibility, corner cases due to models, ...).

I hope I am more clear now,

C*heers,
-----------------------
Alain Rodriguez - alain@thelastpickle.com
France

The Last Pickle - Apache Cassandra Consulting
http://www.thelastpickle.com

2016-07-13 18:39 GMT+02:00 Tyler Hobbs <tyler@datastax.com>:

>
> On Wed, Jul 13, 2016 at 11:32 AM, Anuj Wadehra <anujw_2003@yahoo.co.in>
> wrote:
>
>> Why do you think that skipping 2.2 is not recommended when NEWS.txt
>> suggests otherwise? Can you elaborate?
>
>
> We test upgrading from 2.1 -> 3.x and upgrading from 2.2 -> 3.x
> equivalently.  There should not be a difference in terms of how well the
> upgrade is supported.
>
>
> --
> Tyler Hobbs
> DataStax <http://datastax.com/>
>

Mime
View raw message