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Subject: cassandra upgrade strategy
From: Jurijs Girtakovskis <jgirtakovskis@gmail.com>
In-Reply-To: <e06563880910061230r6c344e8bn7496ff70cb0e0f2c@mail.gmail.com>
Date: Tue, 6 Oct 2009 15:37:04 -0600
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 <e06563880910061230r6c344e8bn7496ff70cb0e0f2c@mail.gmail.com>
To: cassandra-user@incubator.apache.org

Hi,

What would be the direction to take as far as preparing for future  
cassandra updates? My understanding is that there were changes between  
0.3 and 0.4 that required extra work to port (some?) data from older  
format, please correct me if I'm wrong. If that's the case and/or if  
that is a possibility in future, then what would be the right approach  
to take for those considering Cassandra 0.4 for production?

I currently see three possibilities:
	1. That will never happen - formats will always stay compatible and  
newer version will be able to take older data and use it. Nothing to  
do for me.
	2. That may happen, but if it does, there will be a conversion  
utility (built-in or standalone) taking care of upgrade. Nothing to do  
for me, other than running upgrade tool.
	3. That may happen, and if it does data conversion must be performed  
using custom tools. Custom upgrade tool needed.

Thank you in advance for your constructive feedback and/or pointers to  
resources that lead to answers!

-JG