Maris Orbidans wrote:

I have three servers with embedded derby database running on each of
them.
I would like to cluster those databases.   Do I need to have a
controller running on each server ?

From what I've determined so far you'll need at least two controllers for real fault tolerance. Additionally, none of the controllers can share any of the backends. As far as I know the controllers can be on the same physical box as the DB, but this is not required.

Note: my testing has been done with MySQL thus far.

--
Jamin W. Collins
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