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From Ben Hood <>
Subject Writes during schema migration
Date Wed, 18 Dec 2013 14:02:52 GMT

I was wondering if anybody knows any best practices of how to apply a
schema migration across a cluster.

I've been reading this article:

to see what is happening under the covers. However the article doesn't
seem to talk about concurrent write access during the migration

I'm naively assuming that you'd need to block all writes to the
cluster before the migration is started. This is would be firstly
because of potential consistency issues amongst the cluster nodes. But
this would also be because you'd need two versions of your app to
running at the same time.

Does anybody have any experience with doing this kind of thing?



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