Thanks for that link.

Our 1.2 version is 1.2.12

Our 2.0.3 nodes were restarted once.  Before restart, it was the 1.2.12 binary, 
after it was the 2.0.3.  Immediately after the node was back in the cluster, we 
ran nodetool upgradesstables.  We haven't restarted since.

Is a restart required for each node?

From: Robert Coli [mailto:rc...@eventbrite.com]
Sent: Thursday, December 19, 2013 4:17 PM
To: user@cassandra.apache.org
Subject: Re: Issue upgrading from 1.2 to 2.0.3

On Thu, Dec 19, 2013 at 1:03 PM, Parag Patel 
<parag.pa...@fusionts.com<mailto:parag.pa...@fusionts.com>> wrote:
We are in the process of upgrading 1.2 to 2.0.3.
 ...
Please help as this will prevent us from pushing into production.

(as a general commentary : 
https://engineering.eventbrite.com/what-version-of-cassandra-should-i-run/ )

specific feedback on your question :

Did the 2.0.3 nodes see the 1.2.x (which 1.2.x?) nodes after the first restart?

=Rob

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