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From Robert Coli <rc...@eventbrite.com>
Subject Re: Upgrading 1.1 to 1.2 in-place
Date Mon, 30 Dec 2013 18:57:31 GMT
On Mon, Dec 30, 2013 at 6:45 AM, Tupshin Harper <tupshin@tupshin.com> wrote:

> OK.  Given the correction of my unfortunate partitioner error, you can,
> and probably should, upgrade in place to 1.2, but with num_tokens=1 so it
> will initially behave like 1.1 non vnodes would. Then you can do a rolling
> conversion to more than one vnode per node, and once complete, shuffle your
> vnodes.
>

@OP :

1) You should remove nodes, then upgrade in place to 1.2, then optionally
convert to vnodes. Bootstrapping into a mixed version cluster is, if I
understand correctly, not supported.
2) Depending on your data size and process used, using shuffle to convert
to vnodes may fill your nodes/take forever/not work. [1]
3) I have not personally heard a single report of someone successfully
using shuffle on a production cluster with real data. Try it on a
representative data size in non-production first, and if you succeed, let
the list know! :D

If I were you, I would probably :

a) question how much I really need vnodes on a 3 physical nodes per DC
cluster
b) if I decided I didn't really need vnodes, I would first decommission
nodes 6 nodes down to 3 on 1.1
c) Then upgrade my 3 nodes to 1.2 via rolling restart
d) Then use auto_bootstrap:false to upgrade instance hardware on the nodes
by
   i) pre-copy data directory to target with rsync
   ii) configure target node with same initial_token as source node
   iii) drain and stop source node
   iv) re-copy data directory with rsync with --delete, to do final sync of
data directories
   v) start new node with auto_bootstrap:false in conf file [2]

=Rob
[1] https://issues.apache.org/jira/browse/CASSANDRA-5525
[2]
https://engineering.eventbrite.com/changing-the-ip-address-of-a-cassandra-node-with-auto_bootstrapfalse/

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