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From Jon Haddad <>
Subject Re: [EXTERNAL] Cassandra 3.11.X upgrades
Date Wed, 12 Feb 2020 19:21:33 GMT
A while ago, on my first cluster, I decided to do an upgrade by adding
nodes running 1.2 to an existing cluster running version 1.1.  This was a
bad decision, and at that point I decided to always play it safe and always
stick to a single version, and never bootstrap in a node running different
version to a cluster.

I would do this even when it's a trivial upgrade, or a single commit is
different only touching a few lines of code.


I do this because in my opinion it's better to have a single way of doing
things.  Getting in the routine of doing minor upgrades by following Sean's
upgrade checklist will always work.  It's the supported, correct way of
doing things, and if you decide to always follow the same checklist, the
possibility of doing things wrong when there is an
incompatibility decreases.  Think of it as practice.

The only time you should even consider mixed version bootstrap upgrades is
if you know enough to not have to ask the list.  Even then, I go back to my
previous point about practice.  No point in practicing the less safe
version of things.

My 2 cents.


On Wed, Feb 12, 2020 at 11:02 AM Sergio <> wrote:

> Thanks for your reply!
> So unless the sstable format has not been changed I can avoid to do that.
> Correct?
> Best,
> Sergio
> On Wed, Feb 12, 2020, 10:58 AM Durity, Sean R <>
> wrote:
>> Check the readme.txt for any upgrade notes, but the basic procedure is to:
>>    - Verify that nodetool upgradesstables has completed successfully on
>>    all nodes from any previous upgrade
>>    - Turn off repairs and any other streaming operations (add/remove
>>    nodes)
>>    - Stop an un-upgraded node (seeds first, preferably)
>>    - Install new binaries and configs on the down node
>>    - Restart that node and make sure it comes up clean (it will function
>>    normally in the cluster – even with mixed versions)
>>    - Repeat for all nodes
>>    - Run upgradesstables on each node (as many at a time as your load
>>    will allow). Minor upgrades usually don’t require this step (only if the
>>    sstable format has changed), but it is good to check.
>>    - NOTE: in most cases applications can keep running and will not
>>    notice much impact – unless the cluster is overloaded and a single node
>>    down causes impact.
>> Sean Durity – Staff Systems Engineer, Cassandra
>> *From:* Sergio <>
>> *Sent:* Wednesday, February 12, 2020 11:36 AM
>> *To:*
>> *Subject:* [EXTERNAL] Cassandra 3.11.X upgrades
>> Hi guys!
>> How do you usually upgrade your cluster for minor version upgrades?
>> I tried to add a node with 3.11.5 version to a test cluster with 3.11.4
>> nodes.
>> Is there any restriction?
>> Best,
>> Sergio
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