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Migration needed when updating within an Hadoop release

has it ever happened that a migration of persistent data has been needed (or automatically executed) when updating a Hadoop installation within a release?

If so, where could I find information regarding such needed migration?

I would be interested because the runtime of such migration would probably depend on the amount of managed data and had to be planned.

Thank you very much,

Redknee (Germany) GmbH
Geschäftsleitung / Board of Directors: Chris Newton-Smith
Sitz der Gesellschaft: München / Registered office: Munich
Registergericht: München / Commercial registry: Munich, HRB 139030

Alexander Alten-Lorenz 2013-06-14, 10:10
Alexander Alten-Lorenz 2013-06-14, 10:12
Schad, Bjoern-Bernhard 2013-06-14, 11:13
Alexander Alten-Lorenz 2013-06-14, 11:23