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From Sebastian Estevez <sebastian.este...@datastax.com>
Subject Re: Upgrade instructions don't make sense
Date Mon, 23 Nov 2015 23:22:45 GMT
>
> If your cluster does not use vnodes, disable vnodes in each new
> cassandra.yaml


If your cluster *does* use vnodes do *not* disable them.

All the best,


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Sebastián Estévez

Solutions Architect | 954 905 8615 | sebastian.estevez@datastax.com

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On Mon, Nov 23, 2015 at 5:55 PM, Robert Wille <rwille@fold3.com> wrote:

> I’m wanting to upgrade from 2.0 to 2.1. The upgrade instructions at
> http://docs.datastax.com/en/upgrade/doc/upgrade/cassandra/upgradeCassandraDetails.html
has
> the following, which leaves me with more questions than it answers:
>
> If your cluster does not use vnodes, disable vnodes in each new
> cassandra.yaml before doing the rolling restart.
> In Cassandra 2.0.x, virtual nodes (vnodes) are enabled by default. Disable
> vnodes in the 2.0.x version before upgrading.
>
>    1. In the cassandra.yaml
>    <http://docs.datastax.com/en/upgrade/doc/upgrade/cassandra/upgradeCassandraDetails.html#upgradeCassandraDetails__cassandrayaml_unique_7>
file,
>    set num_tokens to 1.
>    2. Uncomment the initial_token property and set it to 1 or to the
>    value of a generated token
>    <http://docs.datastax.com/en/cassandra/2.1/cassandra/configuration/configGenTokens_c.html>
for
>    a multi-node cluster.
>
>
> It seems strange that vnodes has to be disabled to upgrade, but whatever.
> If I use an initial token generator to set the initial_token property of
> each node, then I assume that my token ranges are all going to change, and
> that there’s going to be a whole bunch of streaming as the data is shuffled
> around. The docs don’t mention that. Should I wait until the streaming is
> done before proceeding with the upgrade?
>
> The docs don’t talk about vnodes and initial_tokens post-upgrade. Can I
> turn vnodes back on? Am I forever after stuck with having to have manually
> generated initial tokens (and needing to have a unique cassandra.yaml for
> every node)? Can I just set num_tokens = 256 and comment out initial_token
> and do a rolling restart?
>
> Thanks in advance
>
> Robert
>
>

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