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From Alain RODRIGUEZ <>
Subject Explode a keyspace into multiple ones online
Date Tue, 28 Oct 2014 14:46:41 GMT
Hi guys,

We have a keyspace with more or less 40 tables. We have been adding things
in there since Cassandra 0.8 to our current C* - 1.2.18 there for
simplicity and cost reasons. Now we need to duplicate part of the data to
an other DC, to improve end user latency.

What would be the best way of splitting this ks but staying online (or with
the smallest downtime) ?
What would be advantages / disadvantages of keeping those ks recently
created in the same cluster rather in distinct cluster.

The more general question behind this is, what would be according to your
experience, the main reason of choosing grouping tables into one ks,
multiple ks or directly multiple clusters and how to migrate from these
different architectures ?

Any thoughts, blog addressing this question or even documentation on this ?

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