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From Tatsuya Kawano <>
Subject Rolling upgrade
Date Mon, 10 May 2010 22:01:52 GMT

Does Cassandra support rolling restart recipe between minor version
upgrade? I mean rolling restart is a way to upgrade Cassandra version
or change configuration **without** bringing down the whole cluster.
The recipe will be something like killing a couple of nodes at a time
and starting them again with newer version (or newer configuration.)

To make this possible, I think at least the RPC and SSTable format
should be compatible between older and newer versions. Do you have any
plan to change them in the future? Also, there might be some
exceptions and certain combinations of versions can't coexist in a
cluster (e.g. RPC or SSTable bug in the older version.) It will be
great if such incompatibilities are documented in the release note.


Tatsuya Kawano (mr.)
Tokyo, Japan

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