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From Robert Coli <>
Subject Re: Rollback question regarding system metadata change
Date Tue, 01 Oct 2013 18:40:13 GMT
On Tue, Oct 1, 2013 at 10:51 AM, Christopher Wirt <>wrote:

> Moving back to 1.2.10. What is the procedure roll back from 2.0.1?****
> ** **
> Changes in the system schema seem to make this quite difficult. ****
> ...

First, unfortunately downgrade is not, in my understanding, a supported

In my efforts I’ve now completely taken DC3 offline and already tried:

Are you seeing the new schema on the 1.2.10 nodes?

If the schema has been modified globally via gossip, I don't understand how
your 1.2.10 nodes are currently working. It seems like there may be a risk
of them not working if you restart them?

If the schema changes have been seen globally, the safest solution is to
dump, drop, and re-create your schema. This is likely to require a downtime
across all DCs. You could probably do this semi-online by doing the
(theoretical) clone-a-keyspace-with-hard-links operation, but that would
require application changes/synchronization etc...


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