> On Dec 28, 2017, at 11:09 AM, Durity, Sean R <sean_r_dur...@homedepot.com>
> wrote:
>
> --> See inline
>
> Hello All,
>
> We are going add 2 new nodes to our production server, there are 2 questions
> would like to have some advices?
>
> 1. In current production env, the cassandra version is 3.0.4, is it ok if we
> use 3.0.15 for the new node?
>
> --> I would not do this. Streaming between versions usually doesn't work.
> Either upgrade the existing node before adding new ones OR do the upgrade
> after adding 3.0.4 nodes.
Especially across 3.0.14, we changed the internode messaging protocol. You’ll
want to upgrade first and add new nodes second
>
> 2. Current RF is 1, we would like change to 2, how does this change affect
> our production data, do we need to do any data migration?
>
> --> Once you make the RF change, you will need to run repair on all nodes to
> have the existing data moved to the proper replicas. (New writes will be
> fine.) Until that is complete, query results may not be "correct." Depending
> on how critical the data and application are, it might be better to schedule
> an outage until the repairs are complete.
Or change the application to read at consistency level ALL until the repair is
done
>
> Thanks a lot
> Shijie
>
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