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From Erik Onnen <>
Subject 0.6 to 0.7 upgrade assumptions
Date Tue, 02 Nov 2010 18:31:38 GMT

We're planning an upgrade from 0.6.7 (after it's released) to 0.7.0 (after
it's released) and I wanted to validate my assumptions about what can be
expected. Obviously I'll need to test my own assumptions but I was hoping
for some guidance to make sure my understanding is correct.

My core assumptions are:

1) After taking the upstream services offline and inducing a flush on 0.6
nodes so that all data is compacted, I should be able to start 0.7 binaries
on top of the 0.6 data files with no issue.

2) When upgrading, I can change from RackUnawareStrategy to a
PropertyFileSnitch configuration. My understanding is that read repair will
kick in for the missing facility replicas at a rate roughly equivalent to
the read repair chance.

3) While read repair from #2 is occurring, the now incorrect replica nodes
will continue to be capable of servicing requests for the data that has not
been migrated to the correct replicas.


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